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,



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.


ΔG = ΔH – TΔS would always be negative.

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

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Calculate a) <spaNCERT - Chemistry Part-I