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01/10/2021 11:07 am
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Which of the following pairs of processes is certain to occur in a spontaneous chemical reaction?
(a) Exothermic and increasing disorder
(b) Exothermic and decreasing disorder
(c) Endothermic and increasing disorder
(d) Endothermic and decreasing disorder
1 Answer
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01/10/2021 11:09 am
Correct answer: (a) Exothermic and increasing disorder
Explanation:
Measure of disorder of a system is nothing but entropy. For a spontaneous reaction, ΔG < 0. As per Gibbs Helmholtz equation,
ΔG = ΔH – TΔS
Thus ΔG is -ve only
when ΔH = -ve (exothermic)
and ΔS = +ve (increasing disorder)