Verified Solution • 2025–26 Session moderate

QJEEM16Chd97a: JEE Main 2016 Chemistry - Class 11 JEEM16Chd97a Solution: A reaction at 1 bar is non-spontaneous at low temperature but…

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 :

Multiple Choice Options

  • A Both ΔH and ΔS are negative.
  • B Both ΔH and ΔS are positive.
  • C ΔH is positive while ΔS is negative.
  • D ΔH is negative while ΔS is positive.

Step-by-Step Verified Solution

We know that ΔG = ΔH − TΔS

At low temperature : ΔG is positive (non-spontaneous process), so ΔH is positive and ΔS is positive (TΔS < ΔH as T is low).

At high temperature : ΔG is negative (spontaneous process), so ΔH is positive and ΔS is positive (TΔS > ΔH as T is high).

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