Question

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

• A. It is highly unstable
• B. Its enthalpy of decomposition is high
• C. It undergoes autooxidation on prolonged standing
• D. None of these

Answer 1

The correct option is C It undergoes autooxidation on prolonged standing

On prolonged standing, hydrogen peroxide undergoes auto oxidation or disproportionation. $2H_2{O}_2\to 2H_{2}O+O_2$ Hence, hydrogen peroxide is always stored in black bottles which cuts off the light and suppresses the auto oxidation.