Question

Which of the following statements are correct about Zn, Cd and Hg?
A. They exhibit high enthalpy of atomization as the d-subshell is full.
B. Zn and Cd do not show variable oxidation state while Hg shows +I and +II.
C. Compounds of Zn, Cd and Hg are paramagnetic in nature.
D. Zn, Cd and Hg are called soft metals.
Choose the most appropriate from the options given below:

• A. B, D only
• B. B, C only
• C. A, D only
• D. C, D only

Answer 1

Answer: (A)

B, D only

Answer 2

- (A) Incorrect. Zn, Cd, and Hg exhibit lower enthalpy of atomization compared to other transition metals in their respective series because they have fully filled d-subshells, which make their bonding weaker.

- (B) Correct. Zn and Cd do not show variable oxidation states, generally remaining in the $+2$ state. Hg, however, can show $+1$ and $+2$ oxidation states due to its unique electron configuration.

- (C) Incorrect. Compounds of Zn, Cd, and Hg are typically diamagnetic because they have fully filled d-orbitals, which do not contribute to unpaired electrons.

- (D) Correct. Zn, Cd, and Hg are known as soft metals due to their malleability and ductility.

The Correct Answer is: B, D only