For the following Assertion and Reason,the co | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

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

Vedclass · Accepted Answer

Both assertion and reason are false.

Vedclass · Answer

(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.

Similar Questions

The $pH$ of a solution is $5.0$. To this solution,sufficient acid is added to decrease the $pH$ to $2.0$. The increase in hydrogen ion concentration is $...$ times.

Which of the following will have the highest $pH$?

Which of the following does not make any change in $pH$ when added to $10 \ mL$ of dilute $HCl$?

The $pH$ of a solution having $[H^{+}] = 10 \times 10^{-4} \, \text{moles/litre}$ will be

When pure water is taken in a container and it absorbs $CO_2$ from the atmosphere,what will be the $pH$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module

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.