Question

A reaction A + B → C + D + q is found to have a positive entropy change. The reaction will be 

(i) possible at high temperature                   (ii) possible only at low temperature 

(iii) not possible at any temperature            (iv) possible at any temperature

Answer 1

Here ΔH = –ve and ΔS= +ve. 

ΔG = ΔH – TΔS. 

For the reaction to be spontaneous, ΔG should be –ve which will be so at any temperature i.e., option (iv) is correct.