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Question

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

A
A and D
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B
A and B
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C
B and C
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D
C and D
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Solution

The correct option is B A and B
We know, ΔG0=RTlnK
ΔH0TΔS0=RTlnK
ΔH0RT+ΔS0R=lnK
From this equation, the slope of the graph of lnK vs 1T is ΔH0R, but since it is an exothermic reaction, the slope should be positive.
Hence the lines that correctly show the temperature dependence of equilibrium constant K, for an exothermic reaction are A and B.

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