When a crystal of $N a O H$ is exposed to air, a liquid layer is developed because :

crystal of

N a O H

melts

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it loses water to the surroundings

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it absorbs moisture from the surroundings

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it undergoes sublimation

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Solution

The correct option is C it absorbs moisture from the surroundings
Sodium hydroxide is hygroscopic. When exposed to air, it absorbs moisture and carbon dioxide and forms sodium carbonate.
$2 N a O H + C O_{2} \to N a_{2} C O_{3} + H_{2} O$

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N a_{2} C O_{3} . 10 H_{2} O e x p o s e d - --- \to t o a i r N a_{2} C O_{3} . H_{2} O + 9 H_{2} O

This process is called:

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N a_{2} C O_{3} .10 H_{2} O

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When a crystal of NaOH is exposed to air, a liquid layer is developed because :

The correct option is C it absorbs moisture from the surroundingsSodium hydroxide is hygroscopic. When exposed to air, it absorbs moisture and carbon dioxide and forms sodium carbonate.2NaOH+CO2→Na2CO3+H2O

When a crystal of $N a O H$ is exposed to air, a liquid layer is developed because :

The correct option is C it absorbs moisture from the surroundings
Sodium hydroxide is hygroscopic. When exposed to air, it absorbs moisture and carbon dioxide and forms sodium carbonate.
$2 N a O H + C O_{2} \to N a_{2} C O_{3} + H_{2} O$