Question

The colour of coordinate compound is due to​

Answer 1

Answer:

In general, strong-field ligands cause a large split in the energies of d orbitals of the central metal atom (large Δoct). Transition metal coordination compounds with these ligands are yellow, orange, or red because they absorb higher-energy violet or blue light

Answer 2

Answer:

The colour of a complex compound is due to promotion of 3d-electrons of the central atom/ion to d-orbitals.

The colour of the complex compound is due to d−d electronic transition.The d-orbitals of a free transition metal atom or ion are degenerate (all have the same energy.) When transition metals form coordination complexes, the d-orbitals of the metal interact with the electron cloud of the ligands in such a manner that the d-orbitals become non-degenerate (not all having the same energy).