Assertion :The equivalent weight of $K M n O_{4}$ in acidic medium is $31.6$ . Reason: In acidic medium, $M n O_{4}^{-}$ changes to $M n^{2 +}$ ion.

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 acidic medium, the following change occurs:

$M n O_{4}^{-} \to M n^{2 +}$

The change in oxidation state $+ 7 - (+ 2) = + 5$

Therefore, equivalent weight $=$ $\frac{Molecular weight of K M n O_{4}}{5}$

$= \frac{158}{5} = 31.6$

So, option A is the correct answer.

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