It is a pale yellow powder, but on exposure to moisture and $C O_{2}$ it turns to white. What are we talking about?

NaOH

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Na₂O₂

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Na₂O

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Solution

The correct option is B
Na₂O₂

$2 N a_{2} O_{2} + 2 H_{2} O \to 4 N a O H + O_{2}$

$2 N a_{2} O_{2} + 2 C O_{2} \to 2 N a_{2} C O_{3} + O_{2}$

$N a O H$ and $N a_{2} C O_{3}$ are white in colour.

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