1.

In which reaction there will be increase in entropy

Answer»

`Na(s)+H_(2)O(l)rarrNaOH(l) + (1)/(2)H_(2)(G)`
`Ag^(+)(aq)+Cl^(-)(aq)rarrAgCl(s)`
`H_(2)(g)+(1)/(2)O_(2)(g)rarrH_(2)O(l)`
`Cu^(2+)(aq)+4NH_(3)(g) rarr[Cu(NH_(3))_(4)]^(2+)(aq)`

Solution :In reaction (a) Na (s) REACTS with `H_(2)O(l)` to give NaOH(l) and `(1)/(2)H_(2)(g)`. Since, the entropy of a gas is higher than that of liquid and the entropy of liquid is higher than that of solid, THEREFORE, the CHANGE in entropy of this reaction increases.


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