$H_{2}$ gas is liberated when $H_{2} O_{2}$ reacts with:

acidified

K M n O_{4}

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O_{3}

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acidified

K_{2} C r_{2} O_{7}

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H C H O

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Solution

The correct option is B $H C H O$
$O_{3}$ , acidified $K_{2} C r_{2} O_{7}$ and acidic $K M n O_{4}$ are very strong oxidising agents.

Since $H_{2}$ is released from $H_{2} O_{2}$ , hydrogen peroxide thus acts as an oxidising agent which is only possible for the fourth option.

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Acidified K_{2} C r_{2} O_{7}, Alkanline K M n O_{4}, C u S O_{4}, H_{2} O_{2}, C l_{2}, O_{3}, F e C l_{3}, H N O_{3}, a n d N a_{2} S_{2} O_{3}

When $K M n O_{4}$ reacts with acidified $F e S O_{4}$ _________

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