Chemistry - Complete d-block Question with Solution | TestHub

The permanganate ion has an intense purple colour. Mn (+ VII) has a d ${}^0$ configuration. So the colour arises from charge transfer and not from d-d spectra. In ${\mathrm{MnO}}_4{}^{-}$an electron is momentarily changing ${\mathrm{O}}^{-}$- to ${\mathrm{O}}^{-}$and reducing the oxidation state of the metal from $\mathrm{Mn}(\mathrm{VII})$ to Mn (VI). Charge transfer requires that the energy levels on the two different atoms are fairly close. $\mathrm{O}=(8)=2,6$ K L $\mathrm{Mn}(25)=2,8,15$ K L M hence the charge transfer occurs from $\mathrm{L}\to \mathrm{M}$