Question

Why zn cd hg complexes are generally colourless?

Answer 1

become brownish zn cg hg complexes are generally brownish

Answer 2

Explanation:

Electronic configuration of Zn is $[Ar]3d^{10}4s^{2}$.

Electronic configuration of Cd is $[Kr]4d^{10}5s^{2}$.

Electronic configuration of Hg is $[Xe]4f^{14}5d^{10}6s^{2}$.

Since, Zn, Cd, and Hg have completely filled shells and there is no unpaired electrons.

Due to this there is no d-d transition as a result, the complexes formed by Zn, Cd, and Hg are colourless.