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$H_{2} O_{2}$ is always stored in black bottles because:

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it is highly unstable

its enthalpy of decomposition is high

it undergoes auto-oxidation on prolonged standing in light

none of the above

answer is C.

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Detailed Solution

Hydrogen peroxide goes through auto oxidation or disproportionation when left standing for a long time

$2 H_{2} O_{2} \to 2 H_{2} O + O_{2}$

In order to prevent oxidation and block light, hydrogen peroxide is always stored in dark bottles. Hence, correct option is C.

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