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

Catalytic activity of the transition metals and their compounds can be ascribed to:

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

The catalytic of the transition metals and their compounds is described to

The catalytic activity of transition metals and their compounds is mainly due to: a)their magnetic behaviour b)their unfilled d-orbitals c)their ability to adopt variable oxidation state d)their chemical reactivity