NEET 2012 Chemistry question

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

(1)their chemical reactivity
(2)their magnetic behaviour
(3)their unfilled d-orbitals
(4)their ability to adopt variable oxidation statesCorrect

Answer: (4)

Solution

Transition metals and their compounds act as catalysts mainly because they can exhibit multiple oxidation states and so form unstable intermediates (they readily shuttle between oxidation states, e.g. in contact process, / in

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Question ID VK-090984