Which of the following statements are correct about Zn, Cd and Hg?
- (I) they exhibit high enthalpies of atomisation as the d -subshell is full
- (II) Zn and Cd do not show variable oxidation states while Hg shows +I and +II
- (III) Compound of Zn, Cd and Hg are paramagnetic in nature
- (IV) Zn, Cd and Hg are called soft metals
a. I, II, III
b. I, III
c. II, IV
d. IV only