A metallic oxide reacts with water to form its hydroxide, hydrogen peroxide and also liberates oxygen. The metallic oxide could be :

K O_{2}

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{N a}_{2} O_{2}

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C a O

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{L i}_{2} O

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Solution

The correct option is A $K O_{2}$
Potassium superoxide reacts with water as follows:

$2 K O_{2} + 2 H_{2} O ⟶ 2 K O H + H_{2} O_{2} + O_{2}$

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Metals react with water to form either their respective oxides or hydroxides and liberate:

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

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