Question

The colour of $MnO{{}_4}^{-}$ ion is due to:

• A. unpaired d-electrons
• B. d - d transition
• C. d - p transition
• D. charge transfer

Answer 1

The correct option is D charge transfer

The colour of $MnO{{}_4}^{-}$ ion is due to charge transfer theory. Colour is associated with the electrons being promoted from one energy level to another, and absorbing or emitting the energy difference between the two levels. Thus transfer of an electron from M to L or vice-verse results in charge transfer which gives rise to a spectra called charge transfer spectra.

Hence, option D is correct.