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

Step-by-step solution

Among the given reactions only in the case of C (graphite) + 1 2 O ₂( ~g ) CO ( g ) entropy increases because randomness (disorder) increases. Thus, standard entropy change ( S^ ) is positive. Moreover, it is a combustion reaction and all the combustion reactions are generally exothermic, i.e., H^ =- ve We know that aligned & G^ = H^ -T S^ & G^ =-v v -T(+ ve ) aligned Thus, as the temperature increases, the value of G^ decreases.