Question

Bi is stronger oxidiser than Sb . why

Answer 1

Both Sb and Bi have + 3 as more stable oxidation state than +5 due to imert pair effect.but as Bi has f electrons therefore it has +3 most stable oxidatiob state even more stable than Sb.

So Bi has tendency to achieve Bi(III) oxidation state from Bi(V) for stability.

As Bi is under self reduction hence it is more stronger oxidising agent than Sb.