1.

In which of the following reactions, standard reaction entropy change (Delta S^(@)) is positive and standard Gibb's energy (Delta G^(@)) decreases sharply with increasing temperature ?

Answer»

`(1)/(2) C("graphite") + (1)/(2)O_(2)(g) rarr (1)/(2)CO_(2)(g)`
`C("graphite") + (1)/(2)O_(2)(g) rarr CO_(2)(g)`
`CO("graphite") + (1)/(2)O_(2)(g) rarr CO_(2)(g)`
`Mg(s) + (1)/(2)O_(2)(g) rarr MgO(s)`

Solution :`C(s) + (1)/(2) O_(2)(g) rarr CO(g)` Since `DELTA n_(g) (1 - (1)/(2)) = + ve`, `Delta S` is +ve
`Delta G = Delta H - T delta S`
Since, `Delta S` is +ve, increase in temperature will make `T Delta S` more negative and `Delta G` will DECREASE.


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