Question

State whether the given statement is true or false:

Hydrogen peroxide acts both as an oxidizing and as a reducing agent in alkaline solution towards certain first-row transition metal ions.

Answer 1

As oxidizing agent: $H_2{O}_2+2e^{-}\to 2O{H}^{-}$

$2Cr(OH{)}_3+4NaOH+3H_2{O}_2\to 2N{a}_{2}Cr{O}_4+8H_{2}O$,

The oxidation number of chromium increase from +3 to +6.

As reducing agent: $H_2{O}_2+2O{H}^{-}\to O_2+2H_{2}O+2e^{-}$

$2e^{-}+2K_3\left[Fe\right(CN{)}_6]+2KOH+H_2{O}_2\to 2K_4[Fe\left(CN{)}_6\right]+2H_{2}O+O_2$,

The oxidation number of iron decreases from $+3$ to $+2$.

Hence,given statement is True.