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Hydrogen Peroxide

An inorganic ...

Question

An inorganic substance liberates oxygen on heating and turns an acidic solution of $K I$ brown and reduces acidified $K M n O_{4}$ solution. The substance is:

H g O

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H_{2} O_{2}

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K n O_{3}

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P b {(N O_{3})}_{2}

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Solution

The correct option is B $H_{2} O_{2}$
Reactions:
$2 H_{2} O_{2} h e a t - - \to 2 H_{2} O + O_{2}$ ;
$2 K I + H_{2} O_{2} A c i d i c - --- \to 2 K O H + I_{2} G i v e s g o l d e n y e l l o w c o l o u r t o f l a m e$
Acidified $K M n O_{4}$ acts as an oxidising agent when it is decolourised,
$H_{2} O_{2} + O \to H_{2} O + O_{2}$

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