Q. 63.8( 45 Votes )

A reaction, A + B

Answer :

A reaction is said to be feasible of possible when change in Gibbs free energy for that reaction at particular temperature is negative.

We know, change in Gibbs free energy,


ΔG = ΔH – TΔS


Where


ΔH is change in enthalpy


ΔS is change in entropy


T is temperature at which reaction occurs.


Given Energy is released when a forward reaction occurs (since q is on product side), therefore ΔH is negative.


It is also given that entropy change for the reaction is positive.


Thus –TΔS would be negative for all temperatures.


Therefore,


ΔG = ΔH – TΔS would always be negative.


Thus (iv) possible at any temperature is the right answer.


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