Q.

Which of the following process does not involve increase in entropy?

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a

fusion of ice

b

sublimation of NH4Cl

c

decomposition of PCl5(g) into PCl3 and Cl2 gases

d

formation of SO3(g) from SO2 and O2 gases

answer is D.

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Detailed Solution

2SO2(g) + O2(g) 2SO3(g)

number of  gaseous moles are decreasing entropy decreases

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