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
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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