Assertion :Pure water, a non-electrolyte becomes an electrolyte on addition of dil. $H_{2} S O_{4}$ . Reason: In the presence of $H^{+}$ and ions $S O_{4}^{- 2}$ ( from $H_{2} S O_{4}$ ), water becomes capable of dissociation. Sulphuric acid does not take part in the reaction but promotes the reaction or increases the rate of the reaction.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Pure / distilled water is a non-electrolyte .Addition of acid like sulphuric acid makes it an electrolyte.In the presence of $H^{+}$ and ions $S O_{4}^{- 2}$ ( from $H_{2} S O_{4}$ ), water becomes capable of dissociation.Sulphuric acid does not take part in the reaction but promotes the reaction or increases the rate of the reaction.Therefore, it can be called the catalyst of the reaction and thus the electrolysis of acidified water is considered to be an example of catalysis.

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Similar questions

Q. Assertion :The electrolysis of acidified water is considered to be an example of catalysis. Reason: An addition of acid like sulphuric acid makes it an electrolyte. In the presence of

H^{+}

and ions

S O_{4}^{- 2}

, water becomes capable of dissociation. Sulphuric acid does not take part in the reaction but promotes the reaction or increases the rate of the reaction.

Q. 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

O H^{-}

an exothermic reaction.

Assertion (A) Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol.
Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst.

Reason (R) A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in enrgy of reactant and product remains the same.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

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