The correct statement about the use of transition metals as catalysts is:

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Why transition metals are good catalysts:

Two main reasons:

1. Variable oxidation states: Transition metals can change their oxidation state during the reaction, acting as electron donors/acceptors in intermediate steps. This lowers the activation energy.

Example:  in the catalysis of  +  reaction.

2. Ability to adsorb reactants: Transition metals have empty d orbitals that can form weak bonds with reactant molecules, bringing them close together and orienting them for reaction.

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