Assertion: Entropy of system increases for a spontaneous reaction. Reason: Enthalpy of reaction always not decreases for spontaneous reaction.

S is +ve and H is -ve for a spontaneous reaction at all temperatures. Comprehension Standard Gibb’s energy of reaction rG a at a certain temperature can be compound as r r r G H T. S and the change in the value of rH and rS for a reaction with temperature can be computed as follow: 2 2 o o o r r t T t p 2 1 H H C T T 2 2 o o o 2 r r t r t p 1 T S S C ln T r t r G H T. S and by r eq. G RTln K Consider the following reaction: 2 3 CO g 2H g CH OH g Given: f 3 H CH OH,g 201 kJ / mol; f H C