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

1. Variable oxidation states
2. High enthalpy of atomization
3. Paramagnetic behaviour
4. Colour of hydrated ions

Correct answer: Variable oxidation states

Solution

Transition metals exhibit catalytic activity primarily due to their ability to adopt variable oxidation states, which allows them to facilitate redox reactions by providing alternative reaction pathways.

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