Question

Sn²⁺ compounds like SnO and SnCl₂ are well known reducing agents, while PbO₂ acts as an oxidizing agent. Which of the following statements support these reactivities? 

I. SnO is more stable than SnO₂ 

II. Sn⁴⁺ is more stable than Sn²⁺ 

III. Pb⁴⁺ is more stable than Pb²⁺ 

IV. Pb²⁺ is more stable than Pb⁴⁺

(A) I and III 

(B) I, III and IV 

(C) II and IV 

(D) I, II and IV

Answer 1

Correct answer is (C) II and IV

Sn⁺⁴ is more stable than Sn⁺² & Pb⁺² is more stable than Pb⁺⁴

So, Sn⁺² acts as reducing agents & Pb⁺⁴ acts as oxidising agents.

Above fact can also be explain by inert pair effect.