The temperature at which an endothermic reaction becomes spontaneous is Option(A) Â At higher temperatures when the change in entropy is positive.
An endothermic reaction is any process with an increase in the enthalpy ΔH of the system. In such a process, a closed system usually absorbs thermal energy from its surroundings, which is heat transfer into the system. In simple words, the chemical reactions in which the reactants absorb heat energy from the surroundings to form products is called endothermic reaction.
A reaction becomes spontaneous when the value of Entropy(ΔS) is positive and Gibbs free energy(ΔG) is negative.
When temperature is increased, the entropy of the reaction (ΔS), becomes positive as it is directly proportional with the change in temperature.
Gibbs free energy(ΔG) is related to change in temperature(ΔT) as-
ΔG = - nRΔT
Therefore as temperature is increased, the value of Gibbs free energy decreases and becomes more negative.
Thus the overall endothermic reaction becomes spontaneous when Option(A) At higher temperatures when the change in entropy is positive.
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