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.

Explanation

i. Transition metals have umpaired electrons and hence they show paramagnetic behaviour.
ii. Due to the presence of unpaired electrons in the valence shell of transition metals, there is strong interatomic.bonding in them and hence have high enthalpies of atomisation.
"iii. In transition metals there is unpaired electrons and these electrons can readily undergo đ -d transition and hence, they form coloured compounds.
iv. Transition metals have vacant orbitals and can show variable oxidation states. Therefore they act as good catalyst.