Assertion :
Transition metals are good catalysts.
Reason: Transition metals have variable oxidation state.

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
Transition metals are good catalysts due to following reasons.
(1) Transition metals have variable oxidation state.
(2) Due to variable valence, the transition metals can form unstable intermediates which readily decomposes yielding the product and regenerating the catalyst.
(3) Transition metals provide large surface area for reactants to be adsorbed and bring them closer to one another for the reaction to occur.
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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