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Question

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

A
their unfilled d-orbitals
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B
their ability of adopt variable oxidation states
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C
their chemical reactivity
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D
their magnetic behaviour
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Solution

The correct option is A their ability of adopt variable oxidation states
Transition metals show variable oxidation states, due to which they can perform as a catalyst.
For example: Contact process, i.e., manufacturing of sulphuric acid.
SO3++5V2O5SO3++4V2O4
V2O4+O2SO3++4V2O4
V2O4+O2+5V2O5

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