Define the term-Adaptation?

Explanation

`H_2O` acts as an oxidising as well as reducing agent in acidic and basic medium.
i) Oxidising action of `H_2O_2`
a). In acidic medium
`2Fe^(2+) (aq) + 2H^+ (aq) + H_2O_2 (aq) to 2Fe^(3+) (aq) + 2H_2O (l)`
b) In basic medium
` 2Fe^(2+) + H_2O_2 to 2Fe^(3+) + 2OH^-`
ii) Reducing action of `H_2O_2`
a) In acidic medium
`2MnO_4^- + 6H^+ + 5H_2O_2 to 2Mn^(2+) + 8H_2O + 5O_2`
b) In basic medium
`I_2 + H_2O_2 + 2OH^- to 2I^- + 2H_2O + O_2`