When a crystal NaOH is exposed to air a liquid layer is developed on its surface because
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a
Crystal melts
b
It loses water to the surroundings
c
It absorbs moisture and CO2 from the surroundings
d
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