Assertion : ${K M n O}_{4}$ has different equivalent weights in acid, neutral or alkaline medium. Reason: In different medium, change in oxidation number shown by manganese is altogether different.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In neutral and in alkaline medium, one molecule of $K M n O_{4}$ takes up 3 electrons.
Hence, the equivalent weight is one third of its molecular weight.
In acidic medium, one molecule of $K M n O_{4}$ takes up 5 electrons.
Hence, the equivalent weight is one fifth of its molecular weight.

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Assertion :KMnO4 has different equivalent weights in acid, neutral or alkaline medium. Reason: In different medium, change in oxidation number shown by manganese is altogether different.

Assertion : ${K M n O}_{4}$ has different equivalent weights in acid, neutral or alkaline medium. Reason: In different medium, change in oxidation number shown by manganese is altogether different.