Assertion :The purple colour of $K M n O_{4}$ is due to the charge transfer transition. Reason: The intense colour in most of the transition metal complexes is due to $d - d$ transition.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$K M n O_{4}$ has a deep purple color because of charge transfer from the ligand ( $O_{2}$ –) to the metal center. This is called a ligand-to-metal charge transfer.

Due to electronic transition, potassium permanganate is purple in colour. It is not due to d-d transition as Mn in $K M n O_{4}$ exists with +7 oxidation state and it has no d electrons.

Due to charge transfer reaction within the molecule, photons promote an electron from the highest energy MO orbital in one of the Mn-O bonds to an empty d orbital of Mn.

Therefore option B is correct.

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Assertion :The purple colour of KMnO4 is due to the charge transfer transition. Reason: The intense colour in most of the transition metal complexes is due to d−d transition.

Assertion :The purple colour of $K M n O_{4}$ is due to the charge transfer transition. Reason: The intense colour in most of the transition metal complexes is due to $d - d$ transition.