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Preparations and Uses of Sodium Carbonate

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:

A

H g O

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B

H_{2} O_{2}

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C

K N O_{3}

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D

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

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Solution

The correct option is B $H_{2} O_{2}$
$2 H_{2} O_{2} Heat ⟶ 2 H_{2} O + O_{2} 2 K I + H_{2} O_{2} Acidic ⟶ 2 K O H + I_{2} Brown$
$H_{2} O_{2}$ reduces acidified $K M n O_{4}$ solution
$2 K M n O_{4} + 3 H_{2} S O_{4} + 5 H_{2} O_{2} \to K_{2} S O_{4} + 2 M n S O_{4} + 8 H_{2} O + 5 O_{2}$

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