Question

The tendency of the transition elements to form coloured compounds is attributed to
A. transtiton of electrons from one atom to the ether.
B. transition of electrons from s-orbitals of the outer shells to p-orbitals.
C. d-d transition of electron in las but one shell.
D. none of the reason is correct.

Answer 1

Correct Answer - C
According to crystal field theory the colour of the complex is due to the d-d transition of the electron in presence of is due of ligands. For example, in `[Ti(H_(2) O)_(6)]^(3 +)` by absorbing green yellow component of white light, d-d transition of electron takes place and the aqueous solution apperas purple as the purple is the comlimentary colour of greenish-yellow