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Question

Which of the following reactions will have a negative value of S?

A
H2O(l)H2O(g)
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B
2SO2(g)+O2(g)2SO3(g)
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C
Cl2(g)2Cl(g)
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D
CaCO3(s)CaO(s)+CO2(g)
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Solution

The correct option is B 2SO2(g)+O2(g)2SO3(g)
Entropy is a measure of randomness of a system.
Entropy of gases is more than that of solids and liquids.
Entropy increases when there is increase in the number of moles (gaseous) on the product side, i.e., when ng>0

For option (b),
2SO2(g)+O2(g)2SO3(g)
ng=23=1
So, S will be negative or entorpy decreases.

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