Question

Why does ${\mathrm{KMnO}}_4$ shows the d-d transition?

Answer 1

d-d transition:-

• d-d transition is defined as the transition of an electron from a lower energy level d-orbital to a higher energy level d orbital.
• The electron present in the ground state absorbs light in the visible region and the complementary colour appears.

Colour in ${\mathrm{KMnO}}_4$

• Charge transfer transition is responsible for the purple colour of ${\mathrm{KMnO}}_4$.
• Transition metal complexes are commonly coloured and the main reason behind this is d-d transition.