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AIIMS 201926 May
Exam
AIIMS
Year
2019
Date
26 May
Subject
Chemistry
Chapter
Thermodynamics (C)

AIIMS 2019 · 26 May · Chemistry · Thermodynamics (C)

In isolated system, find the condition for spontaneous reaction.

In isolated system, find the condition for spontaneous reaction.

Options

  1. AΔU=0,ΔS=0,ΔG=0\Delta U=0, \Delta S=0, \Delta G=0
  2. BΔU<0,ΔS>0,ΔG<0\Delta U < 0, \Delta S>0, \Delta G < 0
  3. CΔU=0,ΔS>0,ΔG<0\Delta U=0, \Delta S>0, \Delta G < 0
  4. DΔU<0,ΔS<0,ΔG<0\Delta U < 0, \Delta S < 0, \Delta G < 0

Correct answer

C. ΔU=0,ΔS>0,ΔG<0\Delta U=0, \Delta S>0, \Delta G < 0

Step-by-step solution

For an isolated system, q=0,w=0q=0, w=0∴ΔU=0ΔG=ΔH−TΔS\begin{aligned} & \therefore \quad \Delta U=0 \\ & \Delta G=\Delta H-T \Delta S\end{aligned}$Forspontaneousreaction,For spontaneous reaction,\Delta G=-ve.e.\Delta H=0foranisolatedsystem.Thus,for an isolated system. Thus,\Delta S>0$ for the reaction to be spontaneous.
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