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Question

For which of the following the entropy change is negative?

A
Conversion of ozone to oxygen gas
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B
Conversion of graphite to diamond
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C
Both a and b
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D
None of the above
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Solution

The correct option is B Conversion of graphite to diamond
Considering the options one by one,

a) 2O3(g)3O2(g)
As the number of gaseous moles is increasing, ng>0
where,
ng=npnR
nP= total number of gaseous moles of products
nR= total number of gaseous moles of reactants
S>0

b) In the conversion of graphite to diamond, the randomness decreases as diamond has a more organised and packed structure than graphite. So, S<0

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