The purple colour of KMnO4 is due to the transition

Question

The purple colour of KMnO4 is due to the transition (A) C.T. (L → M) (B) C.T. (M → L) (C) d-d (D) p-d

Tardigrade Admin · Accepted Answer

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

MnO X_{4} X^{-}

an electron is momentarily changing

O X^{--}

to

O X^{-}

and reducing the oxidation state of the metal from Mn(VII) to Mn (VI). Charge transfer requires that the energy levels on the two different atoms are fairly close.

O = (8) = 2_{K}, 6_{L}

M n (25) = 2_{K}, 8_{L}, 1 5_{M}

hence the charge transfer occurs from

L \to M

Q. The purple colour of $KMnO X_{4}$ is due to the transition

$C . T . (L \to M)$

$C . T . (M \to L)$

$d - d$

$p - d$

Q. The purple colour of KMnOX4​ is due to the transition

C.T.(L→M)

C.T.(M→L)

d−d

p−d

Q. The purple colour of $KMnO X_{4}$ is due to the transition

$C . T . (L \to M)$

$C . T . (M \to L)$

$d - d$

$p - d$