Sodium peroxide which is a yellow solid, when exposed to air becomes white due to formation of :

H_{2} O_{2}

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N a_{2} O

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N a_{2} O a n d O_{3}

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N a O H a n d N a_{2} C O_{3}

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Solution

The correct option is D $N a O H a n d N a_{2} C O_{3}$
Sodium peroxide reacts with moist atmospheric carbon dioxide to release oxygen according to the equation
$2 N a_{2} O_{2} + 2 C O_{2} \to 2 N a_{2} C O_{3} + O_{2}$
This reaction is also used to regenerate air in enclosed spaces.
$N a_{2} O_{2} + O_{2} \to 2 N a O_{2}$
$2 N a O_{2} + 2 H_{2} O \to 2 N a O H + O_{2} + H_{2} O_{2}$

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Silver articles become black when exposed to air due to formation of:

M n (O H)_{2}

Formation of rust when iron is exposed to moist air is called ________.

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