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Question

For which of the following the entropy change is negative?
  1. Both a and b
  2. None of the above
  3. Conversion of graphite to diamond
  4. Conversion of ozone to oxygen gas


Solution

The correct option is C 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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