1.

Choose the reaction with negative DeltaS value

Answer»

`2NaHCO_(3(s))rarrNa_(2)CO_(3(s))+CO_(2(G))+H_(2)O_((g))`
`Cl_(2(g))rarr2Cl_((g))`
`2SO_(2(g))+O_(2(g))rarr2SO_(3(g))`
`2KClO_(3(s))rarr2KCl_((s))+3O_(2(g))`

Solution :`DeltaS` has negative value if `Deltan_(g)=-ve` i.e. number of gaseous moles DECREASING during a reaction.
For (a), `Deltan_(g)=2-0=2`
For (B), `Deltan_(g)=2-1=1`
For (C ), `Deltan_(g)=2-3=-1` (`DeltaS` negative)
For (d), `Deltan_(g)=3-0=3`
For (e),`Deltan_(g)`=1-0=1


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