Ncert Exercises & Solutions

Q.6. A reaction, A + B → C + D + q is found to have a positive entropy change. The reaction will be
(i) possible at high temperature
(ii) possible only at low temperature
(iii) not possible at any temperature
(iv) possible at any temperature

NEETprep Answer:

For a reaction to be spontaneous, ∆G should be negative.
∆G = ∆H – T∆S
According to the question, for the given reaction,
∆S = positive
∆H = negative (since heat is evolved)
⇒ ∆G = negative
Therefore, the reaction is spontaneous at any temperature.
Hence, alternative (iv) is correct.

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