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The catalytic activity of transition metals and their compounds is ascribed mainly to:

1. their magnetic behaviour
2. their unfilled d-orbitals
3. their ability to adopt variable oxidation state
4. their chemical reactivity

Correct answer: their ability to adopt variable oxidation state

Solution

Transition metals exhibit catalytic activity primarily due to their ability to adopt variable oxidation states, which allows them to form intermediate compounds and facilitate reactions.

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