Question

Why d block elements show various colours can u explain

Answer 1

d block elements show color in both solid and solution form due to their electrons.

Transition elements are usually characterised by having d orbitals. Now when the metal is not bonded to anything else, these d orbitals are degenerate, meaning that they all have the same energy level.

However when the metal starts bonding with other ligands, this changes. Due to the different symmetries of the d orbitals and the inductive effects of the ligands on the electrons, the d orbitals split apart and become non-degenerate (have different energy levels).

This forms the basis of crystal field theory. How these d orbitals split depend on the geometry of the compound that is formed

Answer 2

d block elements show color in both solid and solution form due to their electrons. Transition ... This explains why not all transition metal complexes are colourful. For example copper