Question

# For a reaction taking place in a container in equilibrium with its surroundings, the effect of temperature on its equilibrium constant K in terms of change in entropy is described by:

A
With increase in temperature, the value of K for exothermic reaction decreases because entropy change of the system is positive
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B
With increase in temperature, the value of K for endothermic reaction increases because unfavourable change in entropy of the surroundings decreases
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C
With increase in temperature, the value of K for endothermic reaction increases because the entropy change of the system is negative
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D
With increase in temperature, the value of K for exothermic reaction decreases because favourable change in entropy of the surrounding decreases
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Solution

## The correct options are B With increase in temperature, the value of K for endothermic reaction increases because unfavourable change in entropy of the surroundings decreases D With increase in temperature, the value of K for exothermic reaction decreases because favourable change in entropy of the surrounding decreasesΔSsurr=−ΔHTsurr For endothermic reaction, if Tsurr increases ΔSsurr will increase. For exothermic reaction, if Tsurr increases ΔSsurr will decrease. So, with increase in temperature, the value of K for endothermic reaction increases because unfavourable change in entropy of the surroundings decreases. With increase in temperature, the value of K for exothermic reaction decreases because favourable change in entropy of the surrounding decreases.

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