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NEET Chemistry · d- and f-Block Elements

Transition elements: configuration, occurrence and trends

Taught in NCERT Class 12 Chemistry, Chapter 4: The d- and f-Block Elements.

1 verified question: Easy 0 · Medium 0 · NEET level 1

Sample questions

Sample 1NEET level

Assertion (A): Zinc, cadmium and mercury are not regarded as transition metals. Reason (R): Zinc, cadmium and mercury have completely filled d orbitals in their ground state but partly filled d orbitals in their common oxidation states.

  1. A

    Both A and R are true and R is the correct explanation of A

  2. B

    Both A and R are true but R is not the correct explanation of A

  3. C

    A is true but R is false

  4. D

    A is false but R is true

Show the answer
The answer is C.

Zn, Cd and Hg of group 12 have a full d10 configuration both in the ground state and in their common oxidation states, so they are not regarded as transition metals. R wrongly says their common oxidation states have partly filled d orbitals, so A is true and R is false.

  • A.

    R is false, so it cannot explain A.

  • B.

    R is false: the d10 configuration is retained in their common oxidation states.

  • D.

    A is true: these metals are not regarded as transition metals.

NCERT: Class 12 Chemistry, Unit 4 (The d- and f-Block Elements), Electronic Configurations of the d-Block Elements

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