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(C) The catalytic activity of transition metals for hydrogenation reactions depends on the strength of adsorption of reactants on the metal surface.If

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Both assertion and reason are true and the reason is the correct explanation for the assertion.

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(C) The catalytic activity of transition metals for hydrogenation reactions depends on the strength of adsorption of reactants on the metal surface.If the adsorption is too weak,the reactants do not stay on the surface long enough to react.If the adsorption is too strong,the surface becomes blocked and the product cannot desorb.Group $7-9$ elements possess the optimal strength of adsorption for reactants,which leads to maximum catalytic activity.Therefore,both the assertion and the reason are true,and the reason correctly explains the assertion.

For the following Assertion and Reason,the correct option is
Assertion : For hydrogenation reactions,the catalytic activity increases from Group $5$ to Group $11$ metals with maximum activity shown by Group $7-9$ elements.
Reason : The reactants are most strongly adsorbed on Group $7-9$ elements.

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For the following Assertion and Reason,the correct option isAssertion : For hydrogenation reactions,the catalytic activity increases from Group $5$ to Group $11$ metals with maximum activity shown by Group $7-9$ elements.Reason : The reactants are most strongly adsorbed on Group $7-9$ elements.