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(A) The catalytic activity of transition metals is primarily due to their ability to adopt $Variable \ oxidation \ states$ and provide a large surface

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Variable oxidation states

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(A) The catalytic activity of transition metals is primarily due to their ability to adopt $Variable \ oxidation \ states$ and provide a large surface area with free valencies. These properties allow them to form unstable intermediate compounds with reactants,providing an alternative reaction path with lower activation energy. Therefore,the correct option is $(A)$.

Which one of the following characteristics of the transition metals is associated with their catalytic activity?

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