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(B) The dissociation of water is represented as: $H_{2}O(\ell) \rightleftharpoons H_{(aq)}^{+} + OH_{(aq)}^{-}$.The ionization of water is an endother

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Both assertion and reason are false.

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(B) The dissociation of water is represented as: $H_{2}O(\ell) \rightleftharpoons H_{(aq)}^{+} + OH_{(aq)}^{-}$.The ionization of water is an endothermic process,meaning $\Delta H > 0$.According to Le Chatelier's principle,increasing the temperature shifts the equilibrium in the forward direction,which increases the concentration of both $H^{+}$ and $OH^{-}$ ions.Since $pH = -\log[H^{+}]$,an increase in $[H^{+}]$ leads to a decrease in $pH$.Therefore,the assertion is false because the $pH$ of water decreases with an increase in temperature,and the reason is false because the dissociation of water is endothermic,not exothermic.

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

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