QJEEM02Ch410e: JEE Main 2002 Chemistry - Class 11 JEEM02Ch410e Solution: If an endothermic reaction is non-spontaneous at freezing point …

Question

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If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then :

Accepted Answer

TIPS/Formulae :

Δ G = Δ H - T Δ S

Since

Δ G = Δ H - T Δ S

for an endothermic reaction,

Δ H = + v e

and at low temperature

Δ S = + v e

Hence

Δ G = (+) Δ H - T (+) Δ S

and if

T Δ S < Δ H

(at low temp)

Δ G = + v e

(non spontaneous)

But at high temperature, reaction becomes

spontaneous i.e.

Δ G = - v e .

because at higher temperature

T Δ S > Δ H .

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