1.

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

Answer»

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

Solution :In the FIRST reaction `C(gr.)+(1)/(2)O_(2)(g)rarrCO(g)DeltaS^(@)=+ve`
THEREFORE `DeltaG^(@)=DeltaH^(@)-TDeltaS` that MEANS the value of `DeltaG` DECREASE on INCREASE on increasing temperature.


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