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?

In which of the following reactions, standard reaction entropy change

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") + 1/2O_(2)(g) to CO(g)` `CO(g) + 1/2 O_(2)(g) to CO_(2)(s)` `Mg_(s) + 1/2O_(2)(g) to MGO(s)` `1/2C("graphite") + 1/2 O_(2)(g) to 1/2 CO_(2)(g)` Solution :`C(GR) + 1/2O_(2)(g) to CO(g)` Since `DeltaN_(g) = 1- 1/2 = + ve` `DeltaS = + ve` `DELTAG = DeltaH -TDeltaS` Since `DeltaS` is + ve, increase in TEMPERATURE will make `TDeltaS` more negative and `DeltaG` will decrease with increasing temperature.