Past Paper Solutions
Real exam questions, worked through step by step.
DNA Fingerprinting NEET 2026: Correct Step Sequence
Learn the DNA fingerprinting sequence, distinguish Southern transfer from probe hybridisation, and revise VNTR variation and DNA migration.
Founder, JEEnius - IIT Kanpur Alumni · Nov 4, 2026 · 5 min read
Spectrochemical Series NEET 2026: Ligand Field Order
Option A follows from CO > NH₃ > H₂O > Cl⁻; learn to extract ligand positions, reverse the order and avoid the NH₃–H₂O trap.
Founder, JEEnius - IIT Kanpur Alumni · Nov 4, 2026 · 4 min read
Conductors in Electrostatics NEET 2026: Option C Explained
Check why statements A, C and D are true, why zero field does not mean zero potential, and how to choose option C (3).
Founder, JEEnius - IIT Kanpur Alumni · Nov 4, 2026 · 5 min read
Somatic Hybridisation NEET 2026: Correct Step Order
Follow the D-A-B-C-E sequence from cell isolation to plant regeneration, and identify the two dependency errors in option C.
Founder, JEEnius - IIT Kanpur Alumni · Nov 3, 2026 · 4 min read
Free Expansion of Ideal Gas NEET 2026: Entropy Changes
Calculate entropy changes for insulated ideal-gas free expansion and distinguish the actual process from the reversible path used in the solution.
Founder, JEEnius - IIT Kanpur Alumni · Nov 3, 2026 · 4 min read
Pressure in Fluids NEET 2026: The 100 atm Depth Limit
A 100 atm absolute-pressure limit gives a maximum depth of 990 m; see the full calculation and why 100 atm gauge pressure gives 1000 m.
Founder, JEEnius - IIT Kanpur Alumni · Nov 3, 2026 · 3 min read
Tissue Systems NEET 2026: Matching Answer and Explanation
Match conjunctive tissue, Casparian strips, subsidiary cells and starch sheath, then check why option C is correct and option B fails.
Founder, JEEnius - IIT Kanpur Alumni · Nov 2, 2026 · 4 min read
Sigma and Pi Bonds NEET 2026: Vitamin Record Mismatch
The supplied record tests vitamin sources, not bonds; verify option B and identify the B12–vitamin E source swap that makes option C incorrect.
Founder, JEEnius - IIT Kanpur Alumni · Nov 2, 2026 · 4 min read
Power in AC Circuits NEET 2026: Inductor EMF Ratio
Solve the inductor emf ratio by checking the measured terminals and coil currents, then apply the method to peak emf and average AC power.
Founder, JEEnius - IIT Kanpur Alumni · Nov 2, 2026 · 4 min read
Phases of Plant Growth NEET 2026: Elongation Features
Distinguish elongation from meristematic features, identify why large conspicuous nuclei are the exception, and practise three related questions.
Founder, JEEnius - IIT Kanpur Alumni · Nov 1, 2026 · 5 min read
Oxidation states NEET 2026: Decreasing order explained
Work through the decreasing oxidation-number sequence, eliminate incorrect options and practise charge balance with ions and metal hydrides.
Founder, JEEnius - IIT Kanpur Alumni · Nov 1, 2026 · 4 min read
Standing Waves in Pipes NEET 2026: Node-Count Ratio
Count displacement nodes in open and closed pipes to get the NEET 2026 node-count ratio as 1 and avoid the 5/9 trap.
Founder, JEEnius - IIT Kanpur Alumni · Nov 1, 2026 · 4 min read
Restriction Enzymes NEET 2026: Why C and D Are False
Solve the restriction-enzyme false-pair question by separating palindrome recognition, internal DNA cleavage and terminal nucleotide removal.
Founder, JEEnius - IIT Kanpur Alumni · Oct 31, 2026 · 5 min read
Acidic Strength of Phenols NEET 2026: p-Nitrotoluene
Identify p-nitrotoluene products, compare acidity and basicity, and apply the same substituent rules to phenol practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Oct 31, 2026 · 5 min read
Self Inductance of Solenoid NEET 2026: Formula and Solution
Derive the self-inductance of a long solenoid, identify why option A is correct and practise radius, length and induced-emf questions.
Founder, JEEnius - IIT Kanpur Alumni · Oct 31, 2026 · 4 min read
Microsporogenesis NEET 2026: Correct Sequence Explained
Trace sporogenous tissue to pollen grains, identify where meiosis occurs, and practise chromosome and microspore counts.
Founder, JEEnius - IIT Kanpur Alumni · Oct 30, 2026 · 4 min read
Electron Gain Enthalpy NEET 2026: Halogen Order and Signs
Compare halogen electron gain enthalpies, explain why chlorine comes before fluorine, and distinguish magnitude order from signed-value order.
Founder, JEEnius - IIT Kanpur Alumni · Oct 30, 2026 · 5 min read
Atoms and Nuclei NEET 2026: Uranium Decay Q-Value
Calculate the uranium-238 decay Q-value as 3726 keV using the supplied masses, then check signs, units and the 4 keV trap behind option B.
Founder, JEEnius - IIT Kanpur Alumni · Oct 30, 2026 · 4 min read
Biomolecules NEET 2026: Why B, C and E Are Correct
Learn why B, C and E are correct in this Biomolecules question, with checks on lipids, polymer units, nitrogenous bases and enzymes.
Founder, JEEnius - IIT Kanpur Alumni · Oct 29, 2026 · 5 min read
Zero-Order Reaction NEET 2026: Why the Answer Is 0.75 min
For 2A to B, distinguish reaction rate from A's disappearance rate to calculate 75% completion in 0.75 min.
Founder, JEEnius - IIT Kanpur Alumni · Oct 29, 2026 · 4 min read
Capacitor Networks NEET 2026: Why P Stores One-Sixth
Reduce the series-parallel network, find P's voltage and verify why it stores one-sixth of the total capacitor energy.
Founder, JEEnius - IIT Kanpur Alumni · Oct 29, 2026 · 4 min read
Plasticity NEET 2026: Heterophylly and the Correct Answer
Learn why environment-linked leaf forms indicate plasticity, not dedifferentiation, and apply the distinction to three practice MCQs.
Founder, JEEnius - IIT Kanpur Alumni · Oct 28, 2026 · 5 min read
Some Basic Concepts NEET 2026: n-Butane Combustion
Learn why 116 g of n-butane yields 352 g of CO₂, with a balanced equation, mole conversions and three worked practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Oct 28, 2026 · 4 min read
Escape Velocity NEET 2026: Half-Radius Ratio Explained
Halving a planet's radius at fixed mass raises escape speed by √2; derive the result and compare equal-radius and equal-density cases.
Founder, JEEnius - IIT Kanpur Alumni · Oct 28, 2026 · 4 min read
Cellular Respiration NEET 2026: Match Processes to Sites
Learn the four respiration-site matches, why option C is correct, and how to distinguish the ETS location from the proton accumulation site.
Founder, JEEnius - IIT Kanpur Alumni · Oct 27, 2026 · 4 min read
Redox Reactions and Electrochemistry NEET 2026: Ionic Conductivity
Recover the salt’s limiting molar conductivity from the slope, then subtract the cation contribution to obtain 80.0 S cm² mol⁻¹, option A.
Founder, JEEnius - IIT Kanpur Alumni · Oct 27, 2026 · 4 min read
Zener Diode and p-n Junction NEET 2026: Finding the 2 V Drop
Find why the resistor voltage is 2 V, not 3 V, using the breakdown check, signed node potentials and the correct measurement points.
Founder, JEEnius - IIT Kanpur Alumni · Oct 27, 2026 · 4 min read
Pollination NEET 2026: Xenogamy vs Geitonogamy
Learn why xenogamy is correct, how geitonogamy differs and how to classify pollination by tracing pollen to its donor plant.
Founder, JEEnius - IIT Kanpur Alumni · Oct 26, 2026 · 4 min read
D- and f-block elements NEET 2026: Ho³⁺ Unpaired Electrons
Form lanthanide 3+ ions, apply Hund's rule and check why Ho³⁺ has four unpaired electrons.
Founder, JEEnius - IIT Kanpur Alumni · Oct 26, 2026 · 4 min read
Adiabatic Process NEET 2026: Why the Answer Is 124.5 J
Solve the 124.5 J adiabatic expansion question using the first law, the correct heat capacity and a clear work-sign convention.
Founder, JEEnius - IIT Kanpur Alumni · Oct 26, 2026 · 4 min read
Five Kingdom Classification NEET 2026: Criteria and Answer
Whittaker's five criteria give option 3: A, B, D and E only; reproduction counts, but flagellum presence is not a main criterion.
Founder, JEEnius - IIT Kanpur Alumni · Oct 25, 2026 · 5 min read
P-Block Elements NEET 2026: Manganese Reduction Explained
Manganese is reduced in both halide mixtures; use balanced equations and oxidation numbers to see why option D is correct.
Founder, JEEnius - IIT Kanpur Alumni · Oct 25, 2026 · 4 min read
Momentum of Photon NEET 2026: Electron-to-Photon Ratio
Solve the 20 eV electron–photon question using the correct momentum formulas, obtain the ratio 225 and check why option A reverses the answer.
Founder, JEEnius - IIT Kanpur Alumni · Oct 25, 2026 · 4 min read
Steps of Respiration NEET 2026: Correct Order Explained
Follow oxygen through the five steps of respiration to derive C, B, E, A, D and avoid confusing alveolar exchange with tissue exchange.
Founder, JEEnius - IIT Kanpur Alumni · Oct 24, 2026 · 4 min read
Classification NEET 2026: Oxygen Ionization Enthalpy
Compare oxygen, nitrogen and fluorine using electronic configurations, paired-electron repulsion and effective nuclear charge.
Founder, JEEnius - IIT Kanpur Alumni · Oct 24, 2026 · 4 min read
Total Internal Reflection NEET 2026: Apparent Depth
Two apparent-depth calculations give option B, 1 cm; learn the correct index ratio, reference interfaces and the slab-thickness trap.
Founder, JEEnius - IIT Kanpur Alumni · Oct 24, 2026 · 4 min read
Renin-Angiotensin Mechanism NEET 2026: Correct Order
Trace the fall in GFR through renin, angiotensin II and aldosterone to solve the five-event sequence and reject option B.
Founder, JEEnius - IIT Kanpur Alumni · Oct 23, 2026 · 5 min read
Solutions NEET 2026: Raoult’s Law and Deviations
Solve the ideal-solution and vapour-pressure question using Raoult’s law, intermolecular attractions and the correct signs of deviation.
Founder, JEEnius - IIT Kanpur Alumni · Oct 23, 2026 · 5 min read
Optics NEET 2026: Two-Lens Image Position and Signs
Solve a separated convex–concave lens problem using signed distances, a virtual object for L2 and two successive lens-formula calculations.
Founder, JEEnius - IIT Kanpur Alumni · Oct 23, 2026 · 4 min read
Life Cycle of Plasmodium NEET 2026: Correct Sequence
Follow sporozoites from mosquito inoculation to liver and RBC multiplication, then gametocyte formation, to solve the five-stage sequence question.
Founder, JEEnius - IIT Kanpur Alumni · Oct 22, 2026 · 5 min read
Chemical Thermodynamics NEET 2026: Protein Entropy
Equal protein concentrations give K = 1: calculate the standard entropy change and avoid the Celsius and kilojoule traps.
Founder, JEEnius - IIT Kanpur Alumni · Oct 22, 2026 · 4 min read
LCR Circuit and Power Factor NEET 2026: Peak Current
A worked series LCR solution: find the 2.2 A peak current, verify unity power factor and avoid peak-versus-RMS errors.
Founder, JEEnius - IIT Kanpur Alumni · Oct 22, 2026 · 4 min read
Cloning Vectors NEET 2026: pBR322 BamHI Insertion
BamHI insertion in pBR322 disrupts tetracycline resistance; learn why ampicillin resistance remains and how to identify recombinants.
Founder, JEEnius - IIT Kanpur Alumni · Oct 21, 2026 · 4 min read
Compounds of Manganese NEET 2026: KMnO₄ Decomposition
Heating KMnO₄ gives green K₂MnO₄; use the balanced reaction, Mn(+6) oxidation state and one unpaired electron to identify the correct option.
Founder, JEEnius - IIT Kanpur Alumni · Oct 21, 2026 · 4 min read
First Law of Thermodynamics NEET 2026: 600 J Solution
A worked solution showing why the triangular P-V cycle transfers 600 J of net heat, with sign conventions and the monatomic-gas trap explained.
Founder, JEEnius - IIT Kanpur Alumni · Oct 21, 2026 · 4 min read
Frog Morphology NEET 2026: Features That Identify Males
Learn why vocal sacs and the copulatory pad identify male frogs, while bulging eyes, webbed toes and spotted skin do not.
Founder, JEEnius - IIT Kanpur Alumni · Oct 20, 2026 · 4 min read
Standard Electrode Potential NEET 2026: Iron Reduction
Use Gibbs-energy changes and electron counts to derive +0.76 V for iron(III) reduction and avoid the +0.40 V subtraction trap.
Founder, JEEnius - IIT Kanpur Alumni · Oct 20, 2026 · 4 min read
P-n Junction Diode NEET 2026: Depletion Width Order
Compare forward-biased, unbiased and reverse-biased junctions to obtain W3 > W2 > W1 and understand why zero external bias does not remove depletion.
Founder, JEEnius - IIT Kanpur Alumni · Oct 20, 2026 · 4 min read
Cyclostomata NEET 2026: Why Petromyzon Is Correct
Identify Petromyzon by checking every Cyclostomata character, and learn why a cartilaginous skeleton alone cannot settle the answer.
Founder, JEEnius - IIT Kanpur Alumni · Oct 19, 2026 · 4 min read
Organic Compounds Containing Nitrogen NEET 2000: Nitrobenzene
Trace nitrobenzene to N-methylaniline through aniline and phenyl isocyanide, and avoid confusing compound B with answer option B.
Founder, JEEnius - IIT Kanpur Alumni · Oct 19, 2026 · 4 min read
Electromagnetic Spectrum NEET 2026: Answer and Applications
Verify option C by matching all four radiation bands to their NCERT applications, then practise frequency order and application-based questions.
Founder, JEEnius - IIT Kanpur Alumni · Oct 19, 2026 · 5 min read
Contraceptive Methods NEET 2026: Match Names to Categories
Match Progestasert, Multiload 375, diaphragm and Saheli, then check why only option 1 satisfies all four classifications.
Founder, JEEnius - IIT Kanpur Alumni · Oct 18, 2026 · 4 min read
Co-ordination Compounds NEET 2000: Cyanide Complexes
Option C is correct: derive the copper(I) and cadmium(II) cyanide formulas, then use relative stability to explain why only CdS precipitates.
Founder, JEEnius - IIT Kanpur Alumni · Oct 18, 2026 · 5 min read
Stationary Waves in Pipes NEET 2026: Counting Nodes
Both the open pipe's fifth harmonic and the closed pipe's ninth harmonic have five displacement nodes; learn to count them correctly.
Founder, JEEnius - IIT Kanpur Alumni · Oct 18, 2026 · 4 min read
Blood Composition NEET 2026: Counts from 8000 WBCs
Calculate eosinophil and lymphocyte counts from 8000 WBCs, match option B and avoid percentage-conversion errors.
Founder, JEEnius - IIT Kanpur Alumni · Oct 17, 2026 · 4 min read
Redox Reactions and Electrochemistry NEET 2000: Copper Potential
Find why copper(I) disproportionation gives 0.38 V, how Gibbs energy yields the missing potential, and which sign and electron-count errors to avoid.
Founder, JEEnius - IIT Kanpur Alumni · Oct 17, 2026 · 4 min read
Q-value of Nuclear Reaction NEET 2026: Uranium Alpha Decay
Find the uranium alpha-decay Q-value using the supplied masses, convert 3.726 MeV to 3726 keV and avoid the rounding error behind option B.
Founder, JEEnius - IIT Kanpur Alumni · Oct 17, 2026 · 4 min read
Muscle Contraction NEET 2026: Why Option D Is Correct
Option D (4) is correct: learn why A, B, D and E hold, why calcium does not break cross bridges, and how ATP triggers detachment.
Founder, JEEnius - IIT Kanpur Alumni · Oct 16, 2026 · 5 min read
Organic Compounds Containing Halogens NEET 2001: Wurtz Solution
Learn why t-butyl chloride is correct in the 2001 question by constructing its formal Wurtz product and counting equivalent hydrogen environments.
Founder, JEEnius - IIT Kanpur Alumni · Oct 16, 2026 · 4 min read
Kinematics NEET 2026: Average Speed with Direction Reversal
Solve a position-time question by finding the direction reversal, adding segment distances and separating average speed from average velocity.
Founder, JEEnius - IIT Kanpur Alumni · Oct 16, 2026 · 4 min read
Juxta Glomerular Apparatus NEET 2026: DCT and Afferent Arteriole
Identify the two structures forming JGA and revise macula densa, renin release and the response to falling GFR.
Founder, JEEnius - IIT Kanpur Alumni · Oct 15, 2026 · 4 min read
Optical Isomerism in Alkanes NEET 2001: Why Option A Is Correct
Learn why 2,3-dimethylpentane is the correct answer by checking C7H16 and comparing the four groups attached to carbon-3.
Founder, JEEnius - IIT Kanpur Alumni · Oct 15, 2026 · 4 min read
Mean Free Path NEET 2026: Number Density Ratio Explained
A worked mean-free-path ratio solution showing why gas A has half the number density of gas B, with the diameter-square trap and three practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Oct 15, 2026 · 4 min read
Spermatogenesis NEET 2026: Divisions and Spermiogenesis
Trace sperm formation from spermatogonia to spermatozoa and see why only statements C and E are correct in this practice question.
Founder, JEEnius - IIT Kanpur Alumni · Oct 14, 2026 · 4 min read
Some Basic Concepts NEET 2001: Virus Molar Mass
Find why option B is correct for the NEET 2001 virus question, with unit conversions and a worked molar mass calculation.
Founder, JEEnius - IIT Kanpur Alumni · Oct 14, 2026 · 4 min read
Magnetic Effects NEET 2026: Parallel-Wire Minimum Height
Find the minimum wire separation by balancing magnetic attraction against weight, then check the floor reaction and the factor-of-two trap.
Founder, JEEnius - IIT Kanpur Alumni · Oct 14, 2026 · 4 min read
Human Skeletal System NEET 2026: B, C and E Explained
A statement-by-statement solution to the skeletal-system MCQ, with the B, C and E answer set and the anatomy behind each verdict.
Founder, JEEnius - IIT Kanpur Alumni · Oct 13, 2026 · 5 min read
Redox Reactions and Electrochemistry NEET 2002: NaCl Cathodes
Learn why aqueous NaCl gives hydrogen at a platinum cathode but sodium amalgam at mercury, and why option B explains the difference.
Founder, JEEnius - IIT Kanpur Alumni · Oct 13, 2026 · 4 min read
Experimental Skills NEET 2026: Optical Bench Index Correction
Learn why optical-bench focal-length measurement needs index correction and how it differs from vernier zero error and resonance-tube end correction.
Founder, JEEnius - IIT Kanpur Alumni · Oct 13, 2026 · 5 min read
Sex Determination NEET 2026: Grasshopper XX–XO System
Identify why 23-chromosome grasshoppers are male and 24-chromosome grasshoppers are female using XX–XO, then check sperm and egg totals.
Founder, JEEnius - IIT Kanpur Alumni · Oct 12, 2026 · 4 min read
Co-ordination Compounds NEET 2002: One Unpaired Electron
Ferricyanide has one unpaired electron; compare all four options using oxidation states, ligand fields and orbital occupancy.
Founder, JEEnius - IIT Kanpur Alumni · Oct 12, 2026 · 5 min read
Photoelectric Effect NEET 2026: Three-Cell Solution
Check emission first, compare stopping potentials and understand the assumption behind option A in the three-cell photoelectric question.
Founder, JEEnius - IIT Kanpur Alumni · Oct 12, 2026 · 4 min read
Ecological Pyramids NEET 2026: Marine Biomass vs Energy
Learn why marine biomass is generally inverted, pond energy is always upright, and option D is correct.
Founder, JEEnius - IIT Kanpur Alumni · Oct 11, 2026 · 4 min read
Chemical Thermodynamics NEET 2003: Graphite to Diamond
Solve the NEET 2003 graphite–diamond question using Gibbs free energy, molar volumes and a checked SI conversion to obtain option A.
Founder, JEEnius - IIT Kanpur Alumni · Oct 11, 2026 · 4 min read
Dual Nature NEET 2026: Electron-to-Photon Momentum Ratio
At 20 eV, the electron has 225 times the photon's momentum; use the correct energy relations and keep the requested ratio in order.
Founder, JEEnius - IIT Kanpur Alumni · Oct 11, 2026 · 4 min read
Bt Crops NEET 2026: Gene Matching and Option A Explained
Match Bt toxin genes to cotton bollworms and corn borer, check both positions in option A, and revise protoxin activation.
Founder, JEEnius - IIT Kanpur Alumni · Oct 10, 2026 · 5 min read
Redox Reactions and Electrochemistry NEET 2003: 2.14 V
Calculate the 2.14 V minimum for aluminium oxide electrolysis by matching Gibbs energy and electron count to one mole of oxygen.
Founder, JEEnius - IIT Kanpur Alumni · Oct 10, 2026 · 4 min read
Thermal Expansion NEET 2026: Sphere Volume Increase
Find the sphere's volume increase, use the correct expansion coefficient, and see why dropping the factor 4/3 leads to option B.
Founder, JEEnius - IIT Kanpur Alumni · Oct 10, 2026 · 4 min read
Cell Membrane NEET 2026: Answer, Bilayer and Glycocalyx
Review the supplied option C answer, phospholipid orientation and RBC membrane composition without memorising a false rule about glycocalyx.
Founder, JEEnius - IIT Kanpur Alumni · Oct 9, 2026 · 5 min read
Organic Compounds Containing Oxygen NEET 2003: Option D Explained
Track acetyl chloride, acetophenone and ethyl addition to see why option D is the tertiary alcohol in this NEET 2003 reaction sequence.
Founder, JEEnius - IIT Kanpur Alumni · Oct 9, 2026 · 5 min read
Floating Body and SHM NEET 2026: Density Ratio of 1/4
For the same floating cork, derive the SHM period and show why doubling it requires one-fourth the liquid density.
Founder, JEEnius - IIT Kanpur Alumni · Oct 9, 2026 · 4 min read
Aves (Birds) NEET 2026: Penguin vs Ostrich Forelimbs
Learn why Aptenodytes, not Struthio, matches both the flightless and swimming-forelimb clues, then test the distinction with three practice MCQs.
Founder, JEEnius - IIT Kanpur Alumni · Oct 8, 2026 · 4 min read
D- and F-Block Elements NEET 2005: Third Ionization Enthalpy
Manganese is the answer to this NEET 2005 PYQ because its third ionization breaks the stable half-filled 3d subshell of Mn²⁺.
Founder, JEEnius - IIT Kanpur Alumni · Oct 8, 2026 · 5 min read
Simple Harmonic Motion NEET 2026: Energy Graph Solution
Use energy conservation to solve the SHM graph question, compare coefficients and avoid the common spring–mass frequency error.
Founder, JEEnius - IIT Kanpur Alumni · Oct 8, 2026 · 4 min read
Cell Organelles NEET 2026: Matching Question Explained
Learn the four organelle matches, why option B is correct and how to avoid confusing membrane composition with structural identity.
Founder, JEEnius - IIT Kanpur Alumni · Oct 7, 2026 · 5 min read
Equilibrium NEET 2005: pH Order and Salt Hydrolysis
Work through the correct pH order for four equal-molar sodium compounds, keeping oxide’s reaction with water separate from anion hydrolysis.
Founder, JEEnius - IIT Kanpur Alumni · Oct 7, 2026 · 5 min read
Physics and Measurement NEET 2026: Vernier Zero Error
The standard Vernier assumption gives 1.06 cm, not option D; work through least count, negative zero error and the source inconsistency.
Founder, JEEnius - IIT Kanpur Alumni · Oct 7, 2026 · 4 min read
Cell Structure and Function NEET 2026: Matching Answer
Understand the four molecule-function matches, why option B is correct, and how Concanavalin A differs from GLUT-4.
Founder, JEEnius - IIT Kanpur Alumni · Oct 6, 2026 · 5 min read
Enthalpy of Neutralisation NEET 2005: MgO and HCl
Solve the NEET 2005 MgO–HCl question using formation enthalpies, and distinguish signed reaction enthalpy from standard neutralisation enthalpy.
Founder, JEEnius - IIT Kanpur Alumni · Oct 6, 2026 · 4 min read
Series LCR Circuit NEET 2026: Peak Current and Resonance
Work through the reactance and impedance calculations that give a peak current of 2.2 A, then practise RMS and changed-frequency variants.
Founder, JEEnius - IIT Kanpur Alumni · Oct 6, 2026 · 4 min read
Phylum Chordata NEET 2026: Symmetry Question Explained
Understand why answer C is correct by checking radial symmetry and the bilateral larva-to-radial adult transition in echinoderms.
Founder, JEEnius - IIT Kanpur Alumni · Oct 5, 2026 · 5 min read
Co-ordination Compounds NEET 2005: Option C Explained
Learn why the cobalt(III) complex is both inner orbital and diamagnetic, and why the zinc, chromium and nickel options fail.
Founder, JEEnius - IIT Kanpur Alumni · Oct 5, 2026 · 4 min read
Electromagnetic Waves NEET 2026: Why Option B Is Incorrect
Work through the 100 m wavelength calculation, verify the propagation direction and understand the notation problem in option C.
Founder, JEEnius - IIT Kanpur Alumni · Oct 5, 2026 · 4 min read
Glycolysis NEET 2026: Pyruvate Count From 206 Glucose
Use the 1:2 glucose-to-pyruvate ratio to calculate 412 pyruvic acid molecules from 206 glucose molecules and check the answer by carbon balance.
Founder, JEEnius - IIT Kanpur Alumni · Oct 4, 2026 · 4 min read
Chemical Thermodynamics NEET 2006: Hydrogenation Answer
Use balanced combustion routes and Hess's law to calculate cyclohexene hydrogenation enthalpy and avoid sign and scaling errors.
Founder, JEEnius - IIT Kanpur Alumni · Oct 4, 2026 · 4 min read
Banking of Roads NEET 2026: Angle and Minimum Tyre Wear
Solve the banked-road question using zero required friction, derive the design-speed formula, and see why a radius error leads to option B.
Founder, JEEnius - IIT Kanpur Alumni · Oct 4, 2026 · 4 min read
Calvin Cycle NEET 2026: Three Glucose Require 18 Turns
Three glucose equivalents need 18 Calvin-cycle turns; learn the carbon-counting rule and the ATP and NADPH requirements.
Founder, JEEnius - IIT Kanpur Alumni · Oct 3, 2026 · 4 min read
Equilibrium NEET 2006: Dilute HCl and Water Ionisation
Use charge balance and water ionisation to solve the dilute-HCl question, calculate pH and distinguish option B from the exact result.
Founder, JEEnius - IIT Kanpur Alumni · Oct 3, 2026 · 3 min read
Bohr Model of Hydrogen Atom NEET 2026: Radius from Speed
Find hydrogen's orbital radius from electron speed using force balance, then check exponents, units and the coefficient before choosing an option.
Founder, JEEnius - IIT Kanpur Alumni · Oct 3, 2026 · 4 min read
Placentation NEET 2026: Matching Types and Plant Examples
Match pea, tomato, Argemone and primrose to their placentation types using ovule attachment and septa, then check option D.
Founder, JEEnius - IIT Kanpur Alumni · Oct 2, 2026 · 4 min read
Equilibrium NEET 2007: Combining Equilibrium Constants
Reverse, scale and add the supplied reactions to derive K = K2K3^3/K1 and avoid the exponent error in option B.
Founder, JEEnius - IIT Kanpur Alumni · Oct 2, 2026 · 4 min read
Electromagnetic Induction NEET 2026: Solenoid Inductance
Derive a long solenoid's self-inductance using turn density and circular area, then practise how length and radius change the result.
Founder, JEEnius - IIT Kanpur Alumni · Oct 2, 2026 · 4 min read
Photosynthesis NEET 2026: Photorespiration Answer Explained
Solve the photorespiration question with RuBisCO products, gas exchange and energy checks, then practise three related concepts.
Founder, JEEnius - IIT Kanpur Alumni · Oct 1, 2026 · 5 min read
Hydrocarbons NEET 2007: HCl and HI Addition to But-1-yne
Follow HCl and HI additions to but-1-yne, retain the C–Cl bond, and verify why option D is the final geminal dihalide.
Founder, JEEnius - IIT Kanpur Alumni · Oct 1, 2026 · 4 min read
Escape Speed NEET 2026: Half-Radius Ratio Explained
For equal-mass planets, halving the radius increases escape speed by √2; derive the ratio and avoid confusing speed with speed squared.
Founder, JEEnius - IIT Kanpur Alumni · Oct 1, 2026 · 4 min read
Plant Hormones NEET 2026: Cabbage Bolting and Gibberellin
Cabbage internode elongation before flowering means bolting: identify gibberellin, reject the IBA trap and practise three related questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 30, 2026 · 5 min read
Redox Reactions and Electrochemistry NEET 2007: Cu–Ag Equilibrium
Solve the 2007 copper–silver equilibrium MCQ using electron counting and antilogs, and learn why the exponent separates option D from option C.
Founder, JEEnius - IIT Kanpur Alumni · Sep 30, 2026 · 4 min read
Work, Energy and Power NEET 2026: Variable Friction
Solve the linearly decreasing friction MCQ using integration, distinguish signed work from its magnitude, and practise two related variations.
Founder, JEEnius - IIT Kanpur Alumni · Sep 30, 2026 · 4 min read
Meiosis: Prophase-I Stages NEET 2026 and Fungal Matches
Separate fungal sexual-cycle events from prophase-I substages using correct matches, nuclear ploidy checks and three related practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 29, 2026 · 4 min read
Redox Reactions and Electrochemistry NEET 2008: Fuel Cell EMF
Balance pentane combustion, count 32 electrons and use Gibbs energy to obtain the NEET 2008 fuel-cell answer: 1.0968 V.
Founder, JEEnius - IIT Kanpur Alumni · Sep 29, 2026 · 5 min read
Silvered Lens NEET 2000: Why the Answer Is 10 cm
The plane-silvered lens gives 10 cm, not 20 cm, because light passes through the lens twice.
Founder, JEEnius - IIT Kanpur Alumni · Sep 29, 2026 · 4 min read
Classification of Animals NEET 2026: The Crocodile Exception
Reptilia means creep or crawl, but not every reptile has a three-chambered heart: use the crocodile exception to identify option C.
Founder, JEEnius - IIT Kanpur Alumni · Sep 28, 2026 · 4 min read
Chemical Bonding NEET 2008: Bond Order Explained
Use molecular orbital occupancies to calculate four bond orders and identify option D in the Chemical Bonding NEET 2008 question.
Founder, JEEnius - IIT Kanpur Alumni · Sep 28, 2026 · 4 min read
Laws of Motion NEET 2004: Accelerating Wedge Solution
Derive the no-slip acceleration and normal force for a smooth accelerating wedge, with the pseudo-force sign check that rules out option D.
Founder, JEEnius - IIT Kanpur Alumni · Sep 28, 2026 · 4 min read
Tapetum and Microsporangium NEET 2026: Why Option C Is Correct
Option C is correct: use NCERT to check chromosome condensation in diakinesis and distinguish meiosis I from meiosis II.
Founder, JEEnius - IIT Kanpur Alumni · Sep 27, 2026 · 5 min read
Equilibrium NEET 2008: Pressure Ratio of 36:1 Explained
Derive the 36:1 pressure ratio from partial pressures, track the factor of four and avoid the equal-dissociation trap.
Founder, JEEnius - IIT Kanpur Alumni · Sep 27, 2026 · 4 min read
Oscillations and Waves NEET 2004: Car-and-Cliff Echo
Use two Doppler shifts to solve the NEET 2004 car-and-cliff echo question and see why the car speed is one-third of the speed of sound.
Founder, JEEnius - IIT Kanpur Alumni · Sep 27, 2026 · 4 min read
Frog Anatomy NEET 2026: 10 Pairs of Cranial Nerves
Learn why a frog has 10 pairs of cranial nerves and revise its brain divisions, peripheral nerves and three-chambered heart.
Founder, JEEnius - IIT Kanpur Alumni · Sep 26, 2026 · 4 min read
D- and F-block Elements NEET 2009: Manganese Oxidation States
Learn why manganese is option C in the 2009 MCQ, distinguish electron count from oxidation-state variety, and practise charge balance.
Founder, JEEnius - IIT Kanpur Alumni · Sep 26, 2026 · 4 min read
Electromagnetic Induction NEET 2005: Series LCR Solution
Derive option A for the NEET 2005 series LCR question using the 45° phase condition, then check reactance ordering and avoid the wrong sign.
Founder, JEEnius - IIT Kanpur Alumni · Sep 26, 2026 · 4 min read
Bt Toxin Mechanism NEET 2026: Why Alkaline pH Is Correct
Learn why alkaline pH activates Bt protoxin in the NCERT explanation, then trace binding, pore formation and midgut-cell lysis.
Founder, JEEnius - IIT Kanpur Alumni · Sep 25, 2026 · 5 min read
Redox Reactions and Electrochemistry NEET 2009: Copper
Use Gibbs energy and electron counts to derive the copper reduction potential of 0.521 V, then check scaling and sign reversal.
Founder, JEEnius - IIT Kanpur Alumni · Sep 25, 2026 · 4 min read
Properties NEET 2006: Floating-Block Period and SHM
Derive the floating block's SHM period from changing buoyancy and see why option B, the inverse-square-root area dependence, is correct.
Founder, JEEnius - IIT Kanpur Alumni · Sep 25, 2026 · 4 min read
Genetic Disorders NEET 2026: Down’s and Turner’s Explained
Check why both statements are false, revise trisomy 21 and 45, XO, and practise chromosome-count questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 24, 2026 · 4 min read
VSEPR Theory and Bond Angles NEET 2010: Why Option B Is Correct
Learn why ClO₂⁻ < Cl₂O < ClO₂, with electron counts, approximate angles and the lone-pair mistake behind option D.
Founder, JEEnius - IIT Kanpur Alumni · Sep 24, 2026 · 5 min read
Current Electricity NEET 2006: Zero Terminal Voltage
Solve the NEET 2006 two-cell question using the loop equation and zero terminal voltage to obtain R = r₁ - r₂.
Founder, JEEnius - IIT Kanpur Alumni · Sep 24, 2026 · 4 min read
Hormones and Their Functions NEET 2026: Option B Explained
Match GH, LH, ADH and oxytocin to their effects, verify option B, and separate water reabsorption from uterine contractions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 23, 2026 · 5 min read
D- and f-block Elements NEET 2011: Divalent Ion Stability
Use aqueous reduction potentials to rank Co2+, Mn2+, Fe2+ and Cr2+, and learn why a half-filled-shell shortcut gives the wrong answer.
Founder, JEEnius - IIT Kanpur Alumni · Sep 23, 2026 · 4 min read
Rotational Motion NEET 2006: Liquid-Tube Force Explained
Work through the 2006 rotating liquid-tube PYQ with slice-by-slice integration, dimensional checks and two practice variations.
Founder, JEEnius - IIT Kanpur Alumni · Sep 23, 2026 · 4 min read
Embryo Sac Structure NEET 2026: Anther Counts Explained
Resolve the misleading embryo-sac label, understand the keyed anther answer, and revise the cell counts and positions in a typical mature embryo sac.
Founder, JEEnius - IIT Kanpur Alumni · Sep 22, 2026 · 4 min read
Some Basic Principles NEET 2011: Dumas Method Solution
Solve the 2011 Dumas-method question in four steps: dry pressure, STP volume, nitrogen mass and percentage by mass.
Founder, JEEnius - IIT Kanpur Alumni · Sep 22, 2026 · 4 min read
Electrostatics NEET 2009: Concentric Shell Potentials
Work through the three-shell potential comparison, choose the correct denominator for each contribution and see why option A—not D—is correct.
Founder, JEEnius - IIT Kanpur Alumni · Sep 22, 2026 · 4 min read
Chordates and Vertebrates NEET 2026: Human Origins
Check African origin and the supplied NCERT emergence interval separately to see why option D answers this human-evolution question.
Founder, JEEnius - IIT Kanpur Alumni · Sep 21, 2026 · 5 min read
S-block Elements NEET 2012: Hydration and Adsorption
Learn why Li+ < Na+ < K+ < Rb+ is the correct adsorption order and why none of the four supplied options matches it.
Founder, JEEnius - IIT Kanpur Alumni · Sep 21, 2026 · 5 min read
Electromagnetic Induction NEET 2009: Four-Loop Answer
Understand why only the circle and ellipse have varying emf in the NEET 2009 four-loop question, using the boundary-cut rule.
Founder, JEEnius - IIT Kanpur Alumni · Sep 21, 2026 · 5 min read
Adaptive Radiation NEET 2026: Why Convergence Is Correct
Learn why the NEET 2026 mammal question tests convergence, not divergence, with NCERT examples and three practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 20, 2026 · 5 min read
Chemical Kinetics NEET 2013: Rate-Doubling Solution
Solve the NEET 2013 rate-doubling question with the two-temperature Arrhenius equation and see why 34.7 kJ/mol is correct.
Founder, JEEnius - IIT Kanpur Alumni · Sep 20, 2026 · 4 min read
Doppler Effect NEET 2009: Car-and-Hill Echo at 720 Hz
Solve the car-and-hill Doppler question in two stages, check the 720 Hz answer and avoid the sign error that gives 550 Hz.
Founder, JEEnius - IIT Kanpur Alumni · Sep 20, 2026 · 4 min read
Immunity NEET 2026: Secondary Lymphoid Organs Explained
Tonsils and spleen are secondary lymphoid organs; use the NCERT development-versus-response rule to distinguish them from bone marrow and thymus.
Founder, JEEnius - IIT Kanpur Alumni · Sep 19, 2026 · 4 min read
Chemical Thermodynamics NEET 2014: Silver Carbonate Ksp
Solve the NEET 2014 silver carbonate question using standard Gibbs energy, correct unit conversions and the natural-log relation.
Founder, JEEnius - IIT Kanpur Alumni · Sep 19, 2026 · 4 min read
Rotational Motion NEET 2010: Two-Disc Energy Loss
Work through the two-disc solution to obtain option D, separate frictional dissipation from the first disc’s energy decrease, and check the result with practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 19, 2026 · 5 min read
PCR and Selectable Markers NEET 2026: Plasmid Question
Understand why both plasmid statements are true, avoid the chromosomal-integration trap, and distinguish PCR amplification from antibiotic selection.
Founder, JEEnius - IIT Kanpur Alumni · Sep 18, 2026 · 4 min read
D- and f-Block Elements NEET 2008: Second Ionization Order
Learn why second ionization enthalpy follows Cr > Mn > V > Ti by comparing the singly charged ions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 18, 2026 · 4 min read
Gravitation NEET 2011: When Is Gravitational Power Greatest?
Gravity supplies its greatest signed power just before return to Earth's surface; the force-velocity direction check explains why option A is correct.
Founder, JEEnius - IIT Kanpur Alumni · Sep 18, 2026 · 4 min read
Population Interactions NEET 2026: Answer and Sign Table
Option D explained through NCERT interaction signs, with the predation–commensalism trap and three practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 17, 2026 · 4 min read
Co-ordination Compounds NEET 2008: Paramagnetism
Work through ligand charges, oxidation states and spin assignments to see why option C is most paramagnetic under the supplied solution.
Founder, JEEnius - IIT Kanpur Alumni · Sep 17, 2026 · 4 min read
Work, Energy and Power NEET 2012: Stable Equilibrium
Find why r = 2A/B gives stable equilibrium, why U = 0 fails, and how to check potential-energy questions using derivatives.
Founder, JEEnius - IIT Kanpur Alumni · Sep 17, 2026 · 4 min read
Energy Flow in Ecosystem NEET 2026: 10% Law Explained
Solve the NEET 2026 energy-flow question by separating solar capture from trophic transfer and applying Lindeman’s approximate 10% law.
Founder, JEEnius - IIT Kanpur Alumni · Sep 16, 2026 · 5 min read
Hydrocarbons NEET 2024: Diborane Question Explained
Solve the NEET 2024 diborane question by tracking the carbon-boron bond and checking each statement independently.
Founder, JEEnius - IIT Kanpur Alumni · Sep 16, 2026 · 4 min read
Rotational Motion NEET 2012: Cylinder-Spring Solution
A rolling solid cylinder stores 36 J of kinetic energy, giving 0.6 m spring compression when both translation and rotation are counted.
Founder, JEEnius - IIT Kanpur Alumni · Sep 16, 2026 · 4 min read
Diversity in Living World NEET 2026: Animal Symmetry
Learn why option C is correct by checking radial symmetry and separating adult and larval echinoderm traits, then solve three practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 15, 2026 · 5 min read
Chemical Kinetics NEET 2024: Activation Energy Solution
Use the two-temperature Arrhenius equation to get 18.22 kJ/mol, select option C and avoid the rounding error that points to D.
Founder, JEEnius - IIT Kanpur Alumni · Sep 15, 2026 · 4 min read
Lens-Mirror Combination NEET 2012: Why Option C Is Correct
Place the lens focus at the mirror's centre of curvature to get d = 2f1 + f2 and a parallel beam after the final lens passage.
Founder, JEEnius - IIT Kanpur Alumni · Sep 15, 2026 · 5 min read
Gymnosperms NEET 2026: Answer, Gametophytes and Seeds
Option A is correct: distinguish gametophyte development within sporangia from naked seeds that lack fruit enclosure, not a seed coat.
Founder, JEEnius - IIT Kanpur Alumni · Sep 14, 2026 · 4 min read
Equilibrium NEET 2025: Phosphoric Acid Question Solved
Solve the NEET 2025 phosphoric acid question using stepwise ionisation constants, acid-strength order and the distinction between option D and statement D.
Founder, JEEnius - IIT Kanpur Alumni · Sep 14, 2026 · 4 min read
Dual Nature NEET 2012: Threshold Frequency Solution
Find why the threshold frequency is 1.6 x 10^15 Hz and why using the full photon energy gives the wrong option.
Founder, JEEnius - IIT Kanpur Alumni · Sep 14, 2026 · 4 min read
Structural Organisation NEET 2026: Solanaceae Answer
Check why option A is correct for the Solanaceae question, then practise sepal fusion, stamen attachment and ovary position.
Founder, JEEnius - IIT Kanpur Alumni · Sep 13, 2026 · 4 min read
D- and f-block elements NEET 2025: Cr²⁺ vs Nd³⁺
Cr²⁺ has four unpaired electrons and Nd³⁺ has three, making option C the correct answer.
Founder, JEEnius - IIT Kanpur Alumni · Sep 13, 2026 · 4 min read
Lorentz Force NEET 2013: Option C Explained
Option C follows from separating electric and magnetic forces; work through the NEET 2013 solution and three related practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 13, 2026 · 4 min read
Photorespiration NEET 2026: Why Option B Is Correct
Check why option B is correct using RuBisCO activity, gas exchange, phosphoglycolate formation and ATP/NADPH output.
Founder, JEEnius - IIT Kanpur Alumni · Sep 12, 2026 · 4 min read
Chemical Bonding NEET 2025: Four Property Orders Explained
Check four property orders using dipole values, xenon electron counting, bond-length comparisons and bond enthalpies to see why only statements A and D are correct.
Founder, JEEnius - IIT Kanpur Alumni · Sep 12, 2026 · 4 min read
Newton's Law of Cooling NEET 2014: Why the Answer Is 45 °C
Find the 45 °C surroundings temperature using equal-interval excess ratios, check both intervals and identify the error behind option C.
Founder, JEEnius - IIT Kanpur Alumni · Sep 12, 2026 · 4 min read
Meiosis NEET 2026 Assertion-Reason Question Solved
Official step-by-step solution for the meiosis NEET 2026 assertion-reason question explaining why the correct choice is option C and how to avoid common mistakes in similar NEET biology questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 11, 2026 · 4 min read
Reptilia NEET 2026 Assertion-Reason Question Explained
Complete breakdown of the Reptilia NEET 2026 assertion-reason question, official solution, crocodile exception, common mistakes and matching practice questions from Diversity in Living World.
Founder, JEEnius - IIT Kanpur Alumni · Sep 10, 2026 · 4 min read
Oscillations and Waves NEET 2014: Correct Relation for n
Detailed solution to the NEET 2014 oscillations and waves question on a string divided into three segments, explaining the reciprocal frequency relation with derivation and common pitfalls.
Founder, JEEnius - IIT Kanpur Alumni · Sep 10, 2026 · 3 min read
Chromosomal Disorders NEET 2026: Both Statements Incorrect
Official step-by-step solution for the NEET 2026 chromosomal disorders assertion-reason question explaining the exact karyotypes of Down's, Turner's and Klinefelter syndromes plus the 45-second solving technique.
Founder, JEEnius - IIT Kanpur Alumni · Sep 9, 2026 · 4 min read
Natural Selection NEET 2026: Three Patterns and Pitfalls
Breakdown of the NEET 2026 re-held natural selection question showing it produces stabilisation, directional change and disruption but not genetic drift, with method to avoid partial recall errors.
Founder, JEEnius - IIT Kanpur Alumni · Sep 8, 2026 · 4 min read
Thermodynamics NEET 2024: Vibrational Modes f in Terms of γ
Official step-by-step solution to the NEET 2024 Thermodynamics question on vibrational modes f expressed in terms of γ, with derivation, common mistakes, related problems and 90-second solving strategy.
Founder, JEEnius - IIT Kanpur Alumni · Sep 8, 2026 · 3 min read
Lac Operon NEET 2026: Only Statement A is Correct
Official step-by-step solution to the Lac Operon NEET 2026 PYQ explaining why only statement A is correct along with common mistakes and must-revise distinctions between regulator and structural genes.
Founder, JEEnius - IIT Kanpur Alumni · Sep 7, 2026 · 4 min read
Alkynes - Reactions NEET 2025: Propyne Assertion-Reason Solved
Breakdown of the NEET 2025 assertion-reason question on propyne with full stoichiometry, factor-of-10 volume error analysis, practice questions and a 2-minute revision table for terminal alkynes.
Founder, JEEnius - IIT Kanpur Alumni · Sep 7, 2026 · 4 min read
Polarisation and Malus' Law NEET 2025: Three Polaroids at 22.5°
Official step-by-step solution to the NEET 2025 Malus' law question with three polaroids at 22.5° between crossed polarisers, including visualisation, trig identity and mistakes that lead to distractors.
Founder, JEEnius - IIT Kanpur Alumni · Sep 7, 2026 · 3 min read
Equilibrium Constant (Kp) NEET 2025: Hard Numerical Solution
Official solution to the hard NEET 2025 equilibrium constant (Kp) numerical shows why Kp equals 1.8 atm and how forgetting the square on P_CO leads many to pick 3 atm.
Founder, JEEnius - IIT Kanpur Alumni · Sep 6, 2026 · 3 min read
Oscillations and Waves NEET 2025: AQ/AP for Same vmax
Senior faculty breaks down the NEET 2025 oscillations and waves question on two masses with same maximum speed, showing why AQ/AP is sqrt(k1/k2) and how to avoid inversion errors.
Founder, JEEnius - IIT Kanpur Alumni · Sep 6, 2026 · 3 min read
Thermodynamics NEET 2025: Two Spheres Blackbody Radiation
Breakdown of the hard Thermodynamics NEET 2025 question on two blackbody spheres radiating energy, with full solution, mistake analysis, practice questions and time management tips.
Founder, JEEnius - IIT Kanpur Alumni · Sep 5, 2026 · 3 min read
Human Evolution NEET 2026: Assertion Reason on Homo Sapiens Origin
Discover the correct way to tackle assertion-reason questions in human evolution for NEET 2026 by verifying statements independently against NCERT textbook lines on Homo sapiens.
Founder, JEEnius - IIT Kanpur Alumni · Sep 4, 2026 · 3 min read
Boiling Point Elevation NEET 2025: Increasing Order for NaCl and Urea
Senior faculty breaks down the boiling point elevation NEET 2025 question with official solution for ordering NaCl and urea by boiling points, i×C method and practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Sep 4, 2026 · 3 min read
Atoms and Nuclei NEET 2025: De Broglie Wavelength Ratio in Bohr Model
Step-by-step solution to the hard Atoms and Nuclei NEET 2025 question on de Broglie wavelength ratio in hydrogen Bohr orbits, explaining why answer is 4 not 16 and how to avoid the n-factor error.
Founder, JEEnius - IIT Kanpur Alumni · Sep 4, 2026 · 4 min read
Correct Statements on Loop of Henle for Human Physiology NEET 2026
This human physiology NEET 2026 article teaches how to evaluate Loop of Henle statements on permeability and reabsorption, spot the correct option a b d, and avoid the common trap of mixing Na+ and water reabsorption.
Founder, JEEnius - IIT Kanpur Alumni · Sep 3, 2026 · 4 min read
Principles Related NEET 2025: Chlorine Carius Method Numerical
Official step-by-step solution to the hard NEET 2025 chlorine estimation question by Carius method, including why students pick 25% and the exact revision formulas.
Founder, JEEnius - IIT Kanpur Alumni · Sep 3, 2026 · 3 min read
Genetics and Evolution NEET 2026: Convergent Evolution in Marsupials
Breakdown of why placental mammals and Australian marsupials demonstrate convergent evolution, with official NEET solutions, common mistakes and comparisons to divergent evolution for 2026 prep.
Founder, JEEnius - IIT Kanpur Alumni · Sep 2, 2026 · 3 min read
Chemical Kinetics NEET 2025: First-Order Isomerization Numerical
NEET 2025 featured a tough Chemical Kinetics question on first-order isomerization requiring calculation of half-life in picoseconds using Arrhenius equation, with the correct answer being 69.
Founder, JEEnius - IIT Kanpur Alumni · Sep 2, 2026 · 3 min read
Electrostatics NEET 2025: Capacitor Dielectric Charge and Energy
Solution to the NEET 2025 electrostatics question about additional charge and energy change when a K=2 dielectric is inserted into a battery connected capacitor.
Founder, JEEnius - IIT Kanpur Alumni · Sep 2, 2026 · 3 min read
ABO Blood Group Inheritance NEET 2026: Why D Cannot Produce O Child
Discover why IAIB × IAi cannot produce a blood group O child in ABO blood group inheritance NEET 2026 along with official solutions and 45-second allele-check methods.
Founder, JEEnius - IIT Kanpur Alumni · Sep 1, 2026 · 4 min read
Heterogeneous Equilibrium NEET 2017: Why the Answer is 5 L
The NEET 2017 heterogeneous equilibrium question on SrO and SrCO3 is solved step-by-step to show why maximum CO2 pressure occurs at exactly 5 L using Kp with constant moles instead of Boyle's law.
Founder, JEEnius - IIT Kanpur Alumni · Sep 1, 2026 · 3 min read
Lens and Mirror Combination NEET 2025: Object at R/(2μ-1)
Step-by-step solution to the NEET 2025 lens and mirror combination problem with a biconvex lens having one surface polished, explaining the correct object position and common pitfalls.
Founder, JEEnius - IIT Kanpur Alumni · Sep 1, 2026 · 4 min read
Plant Physiology NEET 2008 Senescence Question Explained
Detailed analysis of the Plant Physiology NEET 2008 senescence question revealing it tests active developmental PCD in xylem differentiation rather than visible ageing like leaf abscission.
Founder, JEEnius - IIT Kanpur Alumni · Aug 29, 2026 · 3 min read
Density of Crystal Lattice NEET 2018: BCC to FCC Ratio
Official step-by-step solution and error analysis for the NEET 2018 density of crystal lattice question on iron transitioning from BCC to FCC structure while keeping radius constant.
Founder, JEEnius - IIT Kanpur Alumni · Aug 29, 2026 · 3 min read
Diversity in Living World NEET 2013: Three Correct Statements
Break down the NEET 2013 Diversity in Living World question to identify the three correct statements and master key concepts from bryophytes, pteridophytes and gymnosperms life cycles.
Founder, JEEnius - IIT Kanpur Alumni · Aug 28, 2026 · 4 min read
Induced Emf and Charge Flow NEET 2017: 32 μC Solution
Detailed solution for the induced emf and charge flow NEET 2017 question explaining why the total charge flow is 32 μC and how time dependence is eliminated in the final answer.
Founder, JEEnius - IIT Kanpur Alumni · Aug 27, 2026 · 4 min read
Transcription in Prokaryotes NEET 2024: Sigma Factor Question
Breakdown of the 2024 NEET assertion-reason question on prokaryotic transcription, official solution for sigma factor role, common mistakes and NCERT stage mapping to score full marks.
Founder, JEEnius - IIT Kanpur Alumni · Aug 25, 2026 · 3 min read
Cannizzaro Reaction NEET 2026: Grignard Amine Question
Breakdown of the cyclohexyl magnesium bromide and cyclohexyl amine question from NEET 2026 re-held paper with focus on Cannizzaro reaction NEET 2026 preparation and Grignard reactivity.
Founder, JEEnius - IIT Kanpur Alumni · Aug 25, 2026 · 4 min read
Chemical Kinetics NEET 2026: Reversible Denaturation Solved
Complete step-by-step solution to the 2026 NEET chemical kinetics reversible protein denaturation question, including the exact ΔS° calculation, distractor analysis, and practice numericals.
Founder, JEEnius - IIT Kanpur Alumni · Aug 24, 2026 · 3 min read
Organic Compounds Containing Halogens NEET 2026: Radical HBr Addition
Breakdown of a hard NEET 2026 question testing alkyne reduction to geometrical isomers K and L followed by peroxide-effect HBr addition that yields identical racemic M and N.
Founder, JEEnius - IIT Kanpur Alumni · Aug 23, 2026 · 4 min read
Newton's Laws of Motion NEET 2026: Elastic Collision with Hanging Bob
Complete step-by-step solution for the Newton's Laws of Motion NEET 2026 elastic collision with hanging bob showing why h equals 5 m using NCERT velocity exchange and pendulum energy conservation.
Founder, JEEnius - IIT Kanpur Alumni · Aug 21, 2026 · 3 min read
Structural Organisation NEET 2024: Monocarpellary Ovary MCQ
Official step-by-step solution for the Structural Organisation NEET 2024 monocarpellary ovary question featuring Sesbania and Indigofera from Fabaceae.
Founder, JEEnius - IIT Kanpur Alumni · Aug 21, 2026 · 3 min read
Gravitation NEET 2021: Maximum Height Using Energy Conservation
Step-by-step solution of the gravitation NEET 2021 question on maximum height reached by a particle projected at k times escape velocity using mechanical energy conservation.
Founder, JEEnius - IIT Kanpur Alumni · Aug 21, 2026 · 3 min read
Ecology and Environment NEET 2024: Population Interactions Solved
Senior faculty breaks down the 2024 NEET match-the-following question from Ecology and Environment on population interactions, giving exact pairings, key distinctions and mistakes to avoid.
Founder, JEEnius - IIT Kanpur Alumni · Aug 21, 2026 · 3 min read
Organic Compounds Containing Nitrogen NEET 2026: Why Z is Ethanol
Understand why ethanol is the major product Z in this organic compounds containing nitrogen NEET 2026 question on aliphatic primary amines and unstable diazonium salts.
Founder, JEEnius - IIT Kanpur Alumni · Aug 21, 2026 · 3 min read
Colligative Properties NEET 2016: Official Vapour Pressure Solution
Complete breakdown of the Colligative Properties NEET 2016 vapour pressure question with official solution, common mistakes, linked concepts and similar practice problems.
Founder, JEEnius - IIT Kanpur Alumni · Aug 20, 2026 · 4 min read
Redox Reactions and Electrochemistry NEET 202: Permanganate Question
Detailed solution to the hard NEET 2022 question from redox reactions and electrochemistry neet 202 involving acidified permanganate and calculation of cell potential for spontaneity.
Founder, JEEnius - IIT Kanpur Alumni · Aug 19, 2026 · 3 min read
Kinematics NEET 2021: θ from Circular T to Height 4R
Official step-by-step derivation for the 2021 NEET kinematics question linking circular motion period T to projectile max height 4R and the exact inverse sine expression for θ.
Founder, JEEnius - IIT Kanpur Alumni · Aug 19, 2026 · 3 min read
Gene Cloning Tools NEET 2025: Why C and D Are Correct
Classify five enzymes, handle the word NOT correctly, and reach Option A—C and D only—in the NEET 2025 gene-cloning question.
Founder, JEEnius - IIT Kanpur Alumni · Aug 15, 2026 · 5 min read
Oxides of Transition Metals NEET 2023: Why C and D Are Incorrect
A step-by-step solution showing why statements C and D are incorrect and why option (3) is the right answer.
Founder, JEEnius - IIT Kanpur Alumni · Aug 15, 2026 · 6 min read
Logic Gates NEET 2022: Four-NAND XOR Circuit Solved
Solve the NEET 2022 four-NAND circuit gate by gate and verify its XOR output using Boolean algebra and a complete truth table.
Founder, JEEnius - IIT Kanpur Alumni · Aug 15, 2026 · 4 min read
Cleavage of Ethers NEET 2023: HI Reaction Products
Learn the 60-second method for cleaving benzyl methyl ether with HI and distinguishing benzylic, aryl, SN1 and SN2 pathways.
Founder, JEEnius - IIT Kanpur Alumni · Aug 14, 2026 · 5 min read
Genetics and Evolution NEET 2021: DNA Probe PYQ Answer
A direct solution to the NEET 2021 DNA probe PYQ, covering complementarity, hybridisation, autoradiography and why option D is correct.
Founder, JEEnius - IIT Kanpur Alumni · Aug 14, 2026 · 5 min read
Equivalent Capacitance NEET 2023: 2 μF Key vs 3 μF Working
Step-by-step bridge reduction for the NEET 2023 capacitor question, including the 3 μF calculation, the official 2 μF key and the 6 μF trap.
Founder, JEEnius - IIT Kanpur Alumni · Aug 14, 2026 · 4 min read
Gametogenesis NEET 2022: Correct Answer Explained
Solve the NEET 2022 gametogenesis question by comparing the timelines of spermatogenesis and oogenesis.
Founder, JEEnius - IIT Kanpur Alumni · Aug 14, 2026 · 5 min read
Formal Charge NEET 2026: O2, O1 and O3 Charges Solved
Calculate the formal charges on O2, O1 and O3 correctly, avoid the answer-order trap and reach option B within 90 seconds.
Founder, JEEnius - IIT Kanpur Alumni · Aug 14, 2026 · 4 min read
DNA Replication NEET 2022: Why the Answer Is 60 Cells
A generation-wise solution showing why 10 heavy-labelled E. coli cells produce 60 fully light cells after 60 minutes.
Founder, JEEnius - IIT Kanpur Alumni · Aug 14, 2026 · 5 min read
Organic Compounds Containing Oxygen NEET 2026: Full Solution
A rigorous, intermediate-first solution to the four reagent matches, with error analysis and three aligned practice questions.
Founder, JEEnius - IIT Kanpur Alumni · Aug 13, 2026 · 4 min read
Combination of Lenses NEET 2023: −100 cm Solution
A clean three-layer solution showing the radius signs, individual powers and arithmetic that give the official answer, −100 cm.
Founder, JEEnius - IIT Kanpur Alumni · Aug 13, 2026 · 3 min read
Lac Operon NEET 2022: Correct Answer and Mutation Logic
A step-by-step solution to the NEET 2022 lac operon mutation PYQ, with option analysis and a quick comparison of related mutations.
Founder, JEEnius - IIT Kanpur Alumni · Aug 12, 2026 · 5 min read
Magnetic Effects of Current NEET 2023: Bent-Wire Solution
A complete solution to the NEET 2023 bent-wire question using arc and semi-infinite-wire fields with correct directions.
Founder, JEEnius - IIT Kanpur Alumni · Aug 12, 2026 · 4 min read
Electrostatics NEET 2026: Hard Capacitor PYQ Solved
Solve the hard NEET 2026 capacitor PYQ using correct branch identification, series-parallel reduction and charge checks.
Founder, JEEnius - IIT Kanpur Alumni · Aug 11, 2026 · 4 min read
Plant Growth Regulators NEET 2025: Hard PYQ Solved
An NCERT-based solution to the NEET 2025 plant growth regulator PYQ, covering auxin, ABA, dedifferentiation and apical dominance.
Founder, JEEnius - IIT Kanpur Alumni · Aug 10, 2026 · 6 min read
Hydrocarbons NEET 2026: Re-Exam Stereochemistry Answer
A stepwise solution to the NEET 2026 re-exam MCQ on bromination, syn hydroxylation, and meso versus racemic products.
Founder, JEEnius - IIT Kanpur Alumni · Aug 10, 2026 · 6 min read
Rotational Motion NEET 2026: Hard Momentum Graph PYQ
Solve the hard momentum graph PYQ by adding tangential momentum vectors and checking the start, midpoint and endpoint.
Founder, JEEnius - IIT Kanpur Alumni · Aug 10, 2026 · 4 min read
Aldol Condensation NEET 2026: Why Option A Cannot Form
Solve the hard aldol PYQ by identifying the only enolizable alpha-carbon and tracing each proposed product back to it.
Founder, JEEnius - IIT Kanpur Alumni · Aug 9, 2026 · 5 min read
Genetics and Evolution NEET 2025: RNA World MCQ Answer
Learn why Option A is correct in the NEET 2025 RNA World MCQ and how to verify both statements within 60 seconds.
Founder, JEEnius - IIT Kanpur Alumni · Aug 9, 2026 · 4 min read
Thermodynamics NEET 2026: Hard Re-Exam MCQ Solved
Solve the hard NEET 2026 re-exam MCQ using isothermal work, adiabatic relations and the distinction between state and path functions.
Founder, JEEnius - IIT Kanpur Alumni · Aug 9, 2026 · 4 min read