Verified Solution • 2025–26 Session moderate

QJEEM25Ch5ee7: JEE Main 2025 Chemistry - Class 11 JEEM25Ch5ee7 Solution: Let us consider an endothermic reaction which is…

Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the reaction is spontaneous at boiling point of water. Choose the correct option.

Multiple Choice Options

  • A Both ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} are (-ve)
  • B ΔH\Delta \mathrm{H} is (+ve)(+\mathrm{ve}) but ΔS\Delta \mathrm{S} is (-ve)
  • C ΔH\Delta \mathrm{H} is (−ve)(-\mathrm{ve}) but ΔS\Delta \mathrm{S} is (+ve)
  • D Both ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} are (+ve)

Step-by-Step Verified Solution

Reaction is spontaneous at relatively high temperature and non-spontaneous at low temperature ΔG=ΔH−TΔS\Delta \mathrm{G}=\Delta \mathrm{H}-\mathrm{T} \Delta \mathrm{S} It is only possible when ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} both are positive.

Option (1)

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