Transition metals and their compounds act as catalysts. Explain.

(i) In the titration of Fe^(2+) ions with KMnO_(4) in acidic medium, dil. H_(2)SO_(4) is used but not the dil. HCl. Why ? (ii) Transition metals and their compounds act as catalyst explain.

How would you account for the fact that the transition metals and their compounds are good catalysts in many process ?

Transition metals can form complexes. in: