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When a crystal of caustic soda is exposed to air, a liquid layer is deposited because

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When a crystal of caustic soda is exposed to air, a liquid layer is deposited because

(a) Crystal loses water

(b) Crystal absorbs moisture and CO2

(c) Crystal melts

(d) Crystal sublimes

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Correct answer: (b) Crystal absorbs moisture and CO2

Explanation:

It is hygroscopic and deliquescent. It absorbs moisture and CO2 to form NaCO3

2NaOH + CO2 → Na2CO3 + H2O

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