Q.

Which of the following process decreases the entropy of system.

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a

Evaporation of liquid into vapour.

b

Decomposition of sodium bicarbonate into sodium carbonate, water and carbondioxide 

c

A liquid crystallizes into its solid.

d

Temperature of crystalline solid increases from 0 K to 120 K.

answer is D.

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Detailed Solution

entropy order is Solid < liquid < gas

With increase in temperature randomness increases and entropy increases

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