D Block Practice Questions NEET: 8 Free MCQs Explained

Should I start with chapter MCQs, PYQs or full mocks?

Start with explained chapter MCQs, then move to verified PYQs. These free d-block practice questions for NEET include eight original, single-correct MCQs with answers and explanations below, so you can begin without buying a resource.

Chapter questions are best for learning and diagnosis. Verified previous-year questions check exam-style application; full-length mocks test recall amid subject switching. A full paper is not the most efficient first step for weak d-block concepts. Eight is our editorial practice-set size, not a claim about how many questions appear in NEET.

How do explained MCQs, verified PYQs and full mocks compare?

Explained chapter MCQs isolate chemistry errors, verified PYQs check application to historical exam questions, and full mocks test pacing and recall across subjects. Choose by the mistake you need to expose, not by the size of a question bank.

Each comparison lists original explained chapter MCQs, verified chapter PYQs and full-length mocks, in that order.

Immediate usefulness for d-block revision: MCQs target one rule at a time. PYQs check application after revision. Mocks spread attention across the whole syllabus.
Explanation requirements: MCQs need sound chemistry and useful distractors. PYQs need a traceable paper/year and a checked answer. Mocks need post-paper reasoning checks, not just a total score.
Recurring conceptual errors: MCQs expose repeated configuration mistakes directly. PYQs help if you explain rather than recognise answers. Mocks test recall under mixed-topic conditions but may provide few chapter examples.
Whole-paper pacing value: MCQs offer little. Chapter PYQs also offer little. Full mocks are the right format for subject switching and time allocation.
Principal limitation: Original MCQs are not evidence of actual exam content. Remembering a PYQ answer can disguise weak reasoning. Mock d-block coverage varies, so a full paper is not a guaranteed chapter drill.
Access: The original set below is free. A worked PYQ is linked later in this article. For whole-paper practice, NEET JEEnius AI provides 30 free full-length mocks a month.

Which practice format fits my current preparation?

Use chapter practice when you cannot explain a rule, PYQs when you can, and full papers when the difficulty appears mainly during mixed practice. Your reasoning, not your class or dropper status, should decide the next step.

First encounter, including Class 11 students studying ahead: Read the relevant NCERT material first. Use explained questions to connect definitions with examples before attempting a full mock for chapter diagnosis.
Class 12 students who know definitions but miss exceptions: Attempt the on-page set. Identify whether electron removal, oxidation states or another specific rule is causing the wrong choice.
Students who can explain chapter answers unaided: Move to verified PYQs. Explain why each distractor is wrong, not merely why the keyed answer looks familiar.
Droppers who remember PYQ options: Read the stem and explain the chemistry before looking at the choices. Use unseen original questions to check whether you can apply the rule to unfamiliar wording.
Students whose chapter work is sound but mixed-paper performance drops: Choose full-length mocks. Examine missed words, time pressure and difficulty recalling chemistry after another subject.

This small set provides no score threshold that guarantees readiness. A correct answer with faulty reasoning still needs repair.

Can I attempt eight free d-block practice questions for NEET now?

Attempt these eight free questions before reading the answer section. These are original practice questions, not NEET PYQs, and each has exactly one correct option. Record the rule behind each choice in a few words, and mark guesses so you do not mistake a correct choice for sound reasoning.

1. Which element belongs to the d-block but is excluded from the usual transition-element definition because its atom and usual ion lack an incomplete d subshell?

A. Zinc
B. Iron
C. Chromium
D. Copper

2. Which is the ground-state electronic configuration of an isolated chromium atom?

A. & [A r] 3 d^{4} 4 s^{2} B. & [A r] 3 d^{5} 4 s^{1} C. & [A r] 3 d^{6} 4 s^{0} D. & [A r] 3 d^{3} 4 s^{3}

3. An isolated iron atom loses two electrons to form an iron(II) cation. Which configuration results?

A. & [A r] 3 d^{4} 4 s^{2} B. & [A r] 3 d^{5} 4 s^{1} C. & [A r] 3 d^{6} D. & [A r] 3 d^{8}

4. In the permanganate ion below, what is manganese’s oxidation state? $M n O_{4}^{-}$

A. Plus four
B. Plus six
C. Minus seven
D. Plus seven

5. How many unpaired electrons does a ground-state free iron(III) ion have? This question concerns an isolated ion, with no ligand field or coordination environment.

A. 1
B. 3
C. 5
D. 6

6. The permanganate ion is purple even though manganese has no d electrons in its formal configuration. Which explanation best accounts for this colour?

A. Any species without d electrons must be colourless.
B. Ligand-to-metal charge-transfer absorption can produce colour.
C. Manganese must contain one d electron because the ion is coloured.
D. Its colour proves that an ordinary d–d transition occurs.

7. Which comparison of second ionisation enthalpies is correct for gaseous copper and zinc?

A. Zinc is higher, solely because it lies farther right.
B. They are equal because both singly charged ions contain ten d electrons.
C. Copper is higher because its second ionisation removes a d electron from a filled d subshell.
D. Copper is lower because its singly charged ion still has a 4s electron.

8. Which statement best describes typical interstitial compounds formed by transition metals with small atoms such as carbon or nitrogen?

A. They must have exact whole-number stoichiometry.
B. Their formation necessarily removes metallic conductivity.
C. Small atoms replace every metal atom in the lattice.
D. Small atoms occupy lattice gaps, often producing hard solids that retain metallic conductivity.

What are the answers, and which rule does each one test?

The answer key is: 1 A, 2 B, 3 C, 4 D, 5 C, 6 B, 7 C, 8 D. Check your reasoning against each explanation, including the rejected option. Use the bold concept labels to choose what to revise; do not turn eight editorial questions into a predicted NEET score or a claim of chapter mastery.

1. A, block membership versus transition status. Zinc occupies the d-block, but its atom and usual divalent ion have filled d subshells:

Z n : [A r] 3 d^{10} 4 s^{2} Z n^{2 +} : [A r] 3 d^{10}

The usual transition-element definition requires an incomplete d subshell in the atom or a cation it forms. Copper is the tempting alternative, but copper(II) has an incomplete d subshell:

C u^{2 +} : [A r] 3 d^{9}

2. B, chromium’s ground state. Chromium’s observed configuration is:

C r : [A r] 3 d^{5} 4 s^{1}

The close orbital energies and electron interactions favour this arrangement, with a half-filled d subshell. Option A follows the simple filling sequence mechanically but is not chromium’s ground state.

3. C, electron removal during cation formation. Iron loses its 4s electrons before its 3d electrons:

F e : [A r] 3 d^{6} 4 s^{2} ⟶ F e^{2 +} : [A r] 3 d^{6}

Option A removes two d electrons while keeping both 4s electrons. Do not assume the neutral-atom filling order also determines the order of removal.

4. D, oxidation-state accounting. Oxygen has oxidation state minus two here, and the oxidation-state sum must equal the ion’s charge:

x + 4 (- 2) = - 1 x = + 7

Option B would give an overall charge of minus two, not minus one. Keep the species’ charge in the calculation.

5. C, free-ion unpaired electrons. After losing two 4s electrons and one 3d electron, iron(III) has:

F e^{3 +} : [A r] 3 d^{5}

Hund’s rule places one electron in each d orbital before pairing, giving five unpaired electrons. Option A could result from applying a strong ligand-field result to a question explicitly about a free ion.

6. B, colour beyond d–d transitions. Manganese(VII) has the formal configuration: $3 d^{0}$

Permanganate’s colour arises from charge-transfer absorption, not an ordinary d–d transition. Option A wrongly turns the absence of d–d transitions into a rule that all such species must be colourless.

7. C, second-ionisation reasoning. Compare the singly charged ions first:

C u^{+} : [A r] 3 d^{10} Z n^{+} : [A r] 3 d^{10} 4 s^{1}

Copper’s next removal breaks a filled d subshell; zinc loses its remaining 4s electron and retains a filled d subshell. This explains copper’s higher second ionisation enthalpy, contrary to option A’s mechanical left-to-right argument.

Two parallel second-ionisation pathways showing Cu+ labelled [Ar] 3d10 becoming Cu2+ labelled [Ar] 3d9 by removal of a 3d electron, and Zn+ labelled [Ar] 3d10 4s1 becoming Zn2+ labelled [Ar] 3d10 by removal of a 4s electron.

8. D, interstitial-compound properties. Small atoms occupy gaps in the metal lattice, often increasing hardness while metallic conductivity remains. Option A is too restrictive because these compounds are often non-stoichiometric.

How should I use a worked previous-year question next?

Attempt the historical question before reading its explanation, and write the relevant ionic configurations first. Use D- and f-Block Elements NEET 2008: Second Ionization Order after repairing any second-ionisation error in this set.

An original diagnostic question isolates a chosen misconception. A worked past question checks whether you can apply the rule in an actual historical question format, rather than only in wording designed for teaching.

Cover the choices initially if recognition is a problem. After attempting, compare your reasoning with the worked solution, not just the final answer. One historical question establishes neither current chapter weightage nor a prediction for a future paper.

What should I do after checking my mistakes?

Repair the missed rule before seeking more questions; use a full mock when you are ready to test that rule alongside other topics and subjects. Choose your next task by the reason for the error, not simply your total of correct answers.

Name the missed concept. Write “removed 3d electrons first,” not just “configuration mistake.”
Revisit the relevant NCERT passage. Find the definition, configuration or property that resolves the error.
Explain the rule without looking. Include why the tempting distractor fails.
Reattempt the question. Then seek a fresh question on the same concept.

Separate three kinds of error:

Conceptual error: Use the NCERT-and-explanation loop.
Careless reading: Identify the missed word, such as “free ion,” “second” or “incorrect,” and check it before choosing.
Remembered answer: Hide the choices and attempt an unseen question. Recognition alone does not show understanding.

When chapter reasoning holds but mixed-paper performance needs checking, NEET JEEnius AI has 30 free full-length mocks a month, each with 180 questions, 720 marks and 180 minutes, plus a scored per-subject breakdown. Use the result to select specific errors for repair before attempting another full paper.

Next step: full-length mock tests on NEET JEEnius AI and sit a full 180-question, 720-mark, 180-minute paper, 45 Physics, 45 Chemistry and 90 Biology, and get a scored per-subject breakdown (30 free a month).

Frequently asked questions

Should I start d-block practice with MCQs, PYQs or full mocks?

Start with explained chapter MCQs if you cannot explain the underlying rules. Move to verified PYQs once your reasoning is sound, then use full mocks to test recall and pacing across subjects. A full paper is not the most efficient first step for weak d-block concepts.

Are these d-block questions actual NEET PYQs?

No. These eight questions are original, single-correct practice MCQs with answers and explanations. The article separately links to a worked NEET 2008 question on second ionisation order.

Which topics do these d-block practice questions cover?

The set covers transition-element definitions, chromium's configuration, electron removal during cation formation, oxidation states and free-ion unpaired electrons. It also tests permanganate colour, second ionisation enthalpy and interstitial compounds.

What should I do after getting a d-block MCQ wrong?

Name the exact missed concept and revisit the relevant NCERT passage. Explain the rule without looking, including why the tempting distractor fails, then reattempt the question and try a fresh one on the same concept. Treat careless reading and remembered answers separately from conceptual errors.

D Block Practice Questions NEET: 8 MCQs Explained