Transition elements are frequently used as catalyst because:

Options

A. or variable oxidationk state
B. of high ionic charge
C. large surface area of reactants
D. of their specific nature

Answer

A

Explanation

Because of unparied which d-electrons, transition metals have variable varlency which enables them to form unstable intermediate compounds. These intermediates give reaction path of lower activation enrergy and, therefore increase the rate of the reaction.