Transition elements are used as catalyst because `:`

Options

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

Answer

2

Explanation

General electronic configuration of transition elements is `[` inert gas `](n-1)d^(1-10)`. Energy difference between `(n-1)d` and ns subshell is much less so electron can remove from `(n-1)d` subshells easily. Due to this variable oxidation states shown by transition elements.