With `3d^(4)` configuration, `Cr^(2+)` acts as a reducing agent but `Mn^(3+)` acts as an oxidising agent. Explain.

Tl(NO_3)_3 acts as an oxidising agent. Explain ?

KMnO_4 acts as an oxidising agent in

KMnO_4 act as an oxidising agent in :

With the same d-orbital configuration, Cr^(2+) is a reducing agent while Mn^(3+) is an oxidising agent.Explain.

Give an explanation for the following observation : With the same d-orbital configuration (d^4) , Cr^(2+) ion is a reducing agent but Mn^(3+) ion is an oxidising agent.

Pb^(4+) acts as an oxidising agent but Sn^(2+) acts as reducing agent, why ?