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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A and B

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non of these

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Solution

The correct option is A Exothermic
If you increase the temperature, the position of equilibrium will move in such a way as to reduce the temperature again. It will do that by favouring the reaction which absorbs heat. Therefore, in any equilibrium where the forward reaction is exothermic, increasing the temperature decreases the value of the equilibrium constant.

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