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Preparation of Dioxygen

Finely divide...

Question

Finely divided metals and metal oxides on reaction with hydrogen peroxide liberate __ gas.

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Solution

Hydrogen peroxide readily breaks down in the presence of finely divided metals to liberate oxygen gas:
$2 H_{2} O_{2} + M e t a l \to 2 H_{2} O (l) + O_{2} (g)$

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