1.

For which reaction change of entropy will be positive?

Answer»

`H_2(g) + I_2(g) IFF 2HI(g)`
`HCl(g) + NH_3(g) iff NH_4Cl(s)`
`NH_4NO_3(s ) iff N_2O(g) + 2H_2O`
`MGO(s) + H_2(g) iff Mg(s) + H_2O (l)`

Solution : Entropy of gas is greater than that of liquid and SOLID. In option (c) solid is converted into gaseous PHASE, therefore, in this reaction change of entropy will be POSITIVE.


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