Question

Assertion :A catalyst remains unchanged in composition and quantity at the end of the reaction. Reason: Catalysts are sometimes very specific in respect of reaction.

• A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
• B. If both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.
• C. If Assertion is correct, but Reason is incorrect.
• D. If Assertion is incorrect, but Reason is correct.

Answer 1

The correct option is B If both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.

Catalyst is any substance that increases the rate of a reaction without itself being consumed. A catalyst actually takes part in the reaction even though it itself is not consumed or used up in the course of the reaction. It forms a reaction intermediate that has lower energy (transition state) and thereby alters the reaction rate. At the end of reaction the intermediate breaks and regenerates the catalyst. Its reaction-specific. It may not be effective in another reaction even if the two reactions are of similar type.

Assertion and reason are correct but reason is not the correct explanation.

option B is correct.