The equilibrium constant for a reaction decreases with increase in temperature, the reaction must be :

exothermic

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endothermic

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Both A and B

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None

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Solution

The correct option is A exothermic
Increasing the temperature of the reaction increases the amount of energy present. Thus, increasing the temperature has the effect of decreasing the amount of products of this reaction. The reaction shifts to the left to relieve the stress, and there is an increase in the concentration of reactant so its a exothermic reaction.

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