The catalytic activity of the transition metals and their compound is described to:

Options

A. their chemical reactivity
B. their magnetic behaviour.
C. their filled d-orbitals
D. their abilitiy to adopt multiple oxidation state and their complexing ability.

Answer

D

Explanation

The catalytic property of transition metals is due to their tendency to form reaction intermediates with suitable reactants. These intermediates give reaction path of lower activation energy and, therefore, increase the rate of the reaction.
These reaction inetermediates readily decompose yeilding the products and regenerating the original substance. the transition metals from these reaction intermediates due to the presence of vacant orbitals or their tendency to form variable oxidation states.