JEE Main 2016 Chemistry question

A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following:

(1)H is negative while S is positive
(2)Both H and S are negative
(3)H is positive while S is negative
(4)Both H and S are positiveCorrect

Answer: (4)

Solution

Spontaneity requires . For the sign of to *change* from positive to negative as rises, the temperature-dependent term must work in favour of the reaction, so must be **positive**. And since the reaction is non-spontaneous at low temperature — where the

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Question ID VK-115531