In which of the following rections `H_(2)O_(2)` is not an oxidising agent?

Options

A. (i) (ii)
B. (iii) (iv)
C. (i) (iii)
D. (ii) (iv)

Answer

D

Explanation

The oxidation state of the species are as follows :
(i) `H_(2)O_(2)^(-1) + 2H^(+)+ 2e^(-) rarr 2H_(2) O^(-2)` (ii) `H_(2) O_(2)^(-1) - 2e^(-) rarrO_(2)^(0) + 2H^(+)`
(iii) `H_(2) O_(2)^(-1) + 2e rarr 2O^(-2) H^(-)` (iv) `H_(2) O_(2)^(-1) + 2O^(-2) H^(-) -2e^(-) rarr overset(0)O_(2) + 2H_(2) overset(-2)O`
In (ii) and (iv) `H_(2)O_(2)` acts as a reducing agent as it loses electrons to reduce the other species and itsel undergoes oxidation.