How would you account for the following? 1. Transition metals exh… - Vidyadip

Question

How would you account for the following?

Transition metals exhibit variable oxidation states.
Zr(z=40) and Hf (Z=72) have almost identical redii.
Transition metals and their compounds act as catalyst.

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Answer

Due to incomplete filling of d-orbitals, transition metals show variable oxidation states.
Because of Lanthanoid Contraction.
Because of their ability to show multiple/variable oxidation states.

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