Question

For which of the following reactions, the entropy change will be positive?
A. `H_(2)(g)+I_(2)(g)hArr2HI(g)`
B. `HCl(g)+NH_(3)(g)hArrNH_(4)Cl(s)`
C. `NH_(4)NO_(3)(s)hArrN_(2)O+2H_(2)O(g)`
D. `MgO(s)+H_(2)(g)hArrMg(s)+H_(2)O(l)`

Answer 1

Correct Answer - C
`Deltan_(g)=3-0=3`
Since `Deltan_(g)gt0`, there will be increase in entropy change.