Assertion :Transition metals are efficient catalysts. Reason: Transition metals usually contain incomplete d-orbitals and provide larger surface area for adsorption.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A Catalyst is a substance which accelerates the rate of a chemical reaction without undergoing any change in its chemical composition or mass during the reaction. A catalyst accelerates the rate of a reaction by lowering the activation energy. Transition metals are efficient catalysts. For example, Ni, Pd and Pt are used for the hydrogenation of alkenes.

Transition metals usually contain incomplete d-orbitals (so that they can show variable valency) and provide a larger surface area for adsorption.

Hence, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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