NCERT Class XI Chemistry Thermodynamics Solutions

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Question : 6
Total: 22
A reaction, A + B → C + D + q is found to have a positive entropy change.
The reaction will be
(a) possible at high temperature
(b) possible only at low temperature
(c) not possible at any temperature
(d) possible at any temperature.
Solution:  
(d) : A + B → C + D + q, ΔS = +ve
Here, ΔH = –ve; ΔG = ΔH – TΔS
For reaction to be spontaneous, ΔG should be –ve.
As ΔH = –ve and ΔS is +ve, ΔG will be –ve at any temperature.
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