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Potassium Permanganate

Assertion : ...

Question

Assertion : ${K M n O}_{4}$ is purple in colour due to charge transfer. Reason: There is no electron present in $d -$ orbitals of manganese in ${M n O}_{4}^{-}$ .

A

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

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B

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

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C

Assertion is correct but Reason is incorrect

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D

Assertion is incorrect but Reason is correct

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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
The deep purple colour of potassium permanganate is due to charge transfer from oxygen to Mn.
One of the oxygen becomes $O^{-}$ and the oxidation state of Mn(VII) changes to Mn(VI). Mn(VI) has one unpaired 3d electron. This results in colour. Thus, both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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(a) Assertion and reason both are correct and reason is correct explanation of assertion.
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