Yb^(2+) acts as a reductant while Tb^(4...

`Yb^(2+)` acts as a reductant while `Tb^(4+)` act as an oxidant. Why?

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H_2O_2 acts as a reducing agent in its:

Reaction with a ferrous salt

Reaction with iodides

Reaction with lead sulphide

Reaction with `KMnO_4` in acid medium

KMnO_4 act as an oxidising agent in :

Acidic medium

Alkaline medium

Neutral medium

All of the above media

In which SO_2 acts as oxidant, while reacting with ?

Acidified `KMnO_4`

Acidified `K_2Cr_2O_7`

`H_2S`

Acidified `C_2H_5OH`