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

Options

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

Answer

B

Explanation

Transition metals are show variable oxidation states
`2SO_(2)+O_(2) overset(V_(2)O_(5))rarr 2SO_(3)`
`SO_(2)+overset(+5)V_(2)O_(5)rarrSO_(3)+overset(+4)V_(2)O_(4)`
`overset(+4)V_(2)O_(4)+O_(2)rarr overset(+5)V_(2)O_(5)`