Question

$H_2{O}_2$ is always stored in black bottles because:

• A. it is highly unstable
• B. it has high enthalpy of decomposition
• C. it undergoes auto oxidation on prolonged standing
• D. none of the above

Answer 1

The correct option is C it undergoes auto oxidation on prolonged standing

On prolonged standing, hydrogen peroxide undergoes auto oxidation or disproportionation as follows:

$2H_2{O}_2\to 2H_{2}O+O_2$

Hence, hydrogen peroxide is always stored in black bottles, which cuts off the light and suppresses the auto-oxidation.