The colour of the transition metal ions is//are due to:

Options

A. d-d transition of electrons in presence of ligands
B. charge transfer from ligand to metal ion.
C. change in the geometry
D. Polarisation of anion by cation

Answer

ABD

Explanation

(A) The colour of the transition metal ion/compound is attributed to d-d transition of electrons e.g. in `[Cu(CN_(3))_(4]^(2+)`.
Charge transger spectrum e.g. in `MnO_(4)^(-)`(no. d electron present).
The colour change is not because of change in the geometry of the molecules.
Yellow colour of the `Agl` is due to the polarisation of `l^(-)` by `ag^(+)`.