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When a crystal NaOH is exposed to air a liquid layer is developed on its surface because

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Crystal melts

It loses water to the surroundings

It absorbs moisture and CO₂ from the surroundings

It undergoes sublimation

answer is C.

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Detailed Solution

NaOH is hygroscopic (or) deliquesent in nature, as it absorbs moisture and CO₂ from the surroundings and hence a liquid layer is developed on its surface

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