Explain giving reasons:i. Transition metals and many of their compounds show paramagnetic behaviour.ii. The enthalpies of atomisation of the transition metals are high.iii. The transition metals generally form coloured compounds.iv. Transition metals and their many compounds act as good catalyst.

(1)They show paramagnetic behaviour dto the presence of large number of unpaired electron.
(2)Transition elements have high effective nuclear charge and a large number of valence electrons. Therefore, they form very strong metallic bonds. As a result, the enthalpy of atomization of transition metals is high.
(3)The transition metal generally formed coloured compounds because on providing energy they d-d transition takes place in the visible region of the spectrum
(4)they provide a suitable surface for the reaction to occur