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The d and F Block Elements — NEET Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

Which definition identifies a transition element?
  1. Its atom or at least one common ion has an incomplete d subshell ✓
  2. Every atom has exactly two outer s electrons
  3. It belongs to any group from 3 to 12 regardless of electron configuration
  4. Its compounds must all be coloured
Answer: A. The IUPAC criterion is an incomplete d subshell in the atom or an ion. Merely occupying the d-block is the closest trap because Zn, Cd and Hg fail the electronic criterion.
Why not B: Several transition atoms have ns1 configurations, and outer s count is not the definition.
Why not C: Group 12 elements have filled d10 configurations in atoms and common ions and are excluded by IUPAC.
Why not D: d0 and d10 species can be colourless even when the element otherwise qualifies.
Why is zinc not classified as a transition element?
  1. Zinc has no d electrons in its atom
  2. Zinc is not located in the d-block
  3. Zn and Zn2+ have completely filled d10 subshells ✓
  4. Zinc cannot form any ions
Answer: C. Neither Zn atom nor its common Zn2+ ion has an incomplete d subshell, so it is excluded. Saying it lies outside the d-block confuses location with transition classification.
Why not A: Neutral Zn contains a filled 3d10 subshell.
Why not B: Zinc is the group-12 end member of the 3d block but fails the IUPAC electronic criterion.
Why not D: Zinc readily forms Zn2+.
What is the spin-only magnetic moment of high-spin Co2+, whose configuration is 3d7?
  1. 3.87 BM for three unpaired electrons ✓
  2. 5.92 BM for five unpaired electrons
  3. 2.84 BM for two unpaired electrons
  4. 1.73 BM for one unpaired electron
Answer: A. High-spin d7 has three unpaired electrons, so μ = √[3(3+2)] = √15 = 3.87 BM. Counting only the two singly occupied orbitals after pairing begins gives the 2.84 trap.
Why not B: A d7 high-spin ion has three rather than five unpaired electrons.
Why not C: Two unpaired electrons describe a typical d8 free-ion count.
Why not D: One unpaired electron describes d9 or d1.

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Every NCERT question in this chapter is solved, free: NCERT solutions — The d and F Block Elements →

Other NEET Chemistry chapters

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Questions

How many NEET questions are there on The d and F Block Elements?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.