For the following Assertion and Reason, the correct option is:
Assertion: The $p^{H}$ of water increases with increase in temperature.
Reason: the dissociation of water into $H^{+}$ and ${OH}^{-}$ is an exothermic reaction.

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Both assertion and reason are true, and the reason is the correct explanation for the assertion

Assertion is not true, but reason is true

Both assertion and reason are true, but the reason is not the correct explanation for the assertion

Both assertion and reason are false

answer is B.

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Detailed Solution

With an increase of temperature, the ionization of water increases implies the hydrogen and hydroxyl ion concentrations increase. Hence, $P^{H}$ and $P^{OH}$ decrease. $H_{2} O \to H^{+} + {OH}^{-}$ Is an endothermic reaction.

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