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  4. Assertion The purple colour of KMnO 4 is due to the charge transfer transition. Reason The intense colour in most of the transition metal complexes is due to d-d transition.

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Q. Assertion The purple colour of $KMnO _{4}$ is due to the charge transfer transition.
Reason The intense colour in most of the transition metal complexes is due to $d-d$ transition.

AIIMSAIIMS 2014

Solution:

Purple colour of $KMnO _{4}$ arises due to charge transfer by oxygen to $Mn$. In this way one of the oxygen is $O ^{-}$and $Mn$ charges from +VII to $VI$ (with one unpaired electron in $3 d$ ).