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The d and F Block Elements — NEET & JEE 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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Read the chapter first

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

Other NEET Chemistry chapters

Some Basic Concepts of ChemistryStructure of AtomClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureThermodynamicsEquilibrium

All 19 chapters →

Questions

How many NEET and JEE 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 and JEE 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.