JEE Main 2016 · 9 Apr · Shift 1 · Chemistry Q35

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ChemistrySingle correct+4 / -1Question 35 of 90

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 :

Both ΔH and ΔS are negative.

Both ΔH and ΔS are positive.

ΔH is positive while ΔS is negative.

ΔH is negative while ΔS is positive.

Answer and worked solution

Official answer: B

$\Delta G=\Delta H-T\Delta S$ is positive at low T and negative at high T only when both ΔH and ΔS are positive.

Topics:Entropy

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JEE Main 2016 · 9 Apr · Shift 1, Chemistry question 35