Write chemical reactions to justify that hydrogen peroxide can function as an oxidising as well as reducing agent.

Explanation

Hydrogen peroxide ,`H_(2)O_(2)` can function as an oxidising as well as reducing agent both in acidic as well as basic medium.
As an oxidising agent:
a. In acidic medium
`Pbs_((s))+4H_(2)O_(2(l))to PbSO_(4(s))+4H_(2)O_((l))`
or `S^(2-) + H_(2)O_(2)to SO_(4)^(2-)+4H_(2)O`
b. In basic medium
`2 Fe^(2+)+H_(2)O_(2)to 2Fe^(3+)+2 overset(o-)OH`
As a reducing agent :
a. In acidic medium
`H_(2)O_(2)+NH_(2)OHto O_(2)+NH_(3)+H_(2)O`
b. In basic medium `H_(2)O_(2)+Ag_(2)Oto 2Ag+H_(2)O+O_(2)`