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Thermodynamics

Question
CBSEENCH11008216
Wired Faculty App

Which of the following lines correctly show the temperature dependence of equilibrium constant K, for an exothermic reaction?

  • A and D

  • A and B

  • B and C

  • C and D

Solution

B.

A and B

∆G° = - RT ln K∆H° - T∆S° = - RT ln K-∆H°RT+∆S°R = ln K

Therefore ln K vs 1/T the graph will be a straight line with slope equal to -∆H°R.Since reaction is
exothermic, therefore ∆H° itself will be negative resulting in positive slope.

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