Which of the following statement(s) is/are correct?
(A) Transition metals and many of their compounds show paramagnetic behaviour.
(B) The enthapies of atomisation of the transition metals are high
(B) The transition metals generally form coloured compounds
(D) Transition metals and their many compounds act as good catalyst.

Explanation

As metal ions generally cotains one or more unpaired electrons in then & hence their complexes are generally paramagnetic.
(B) Because of having larger number of unpaired electron intheir atoms, they have stronger inter atomic interaction and hence stronger bonding between the atoms.
(C) According to CFT, in presence of ligands the colour of the compound is due to the d-d transition of the electrons.
(D) This activity is ascribred to their ability to adopt multiple oxidation state and to form complexes.
Therefore, (A,B,C,D) options are correct.