In the titration of Mohr salt against $K M n O_{4}$ the indicator used is:

Diphenyl amine

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K M n O_{4}

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Phenolphthalein

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Methyl orange

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Solution

The correct option is B $K M n O_{4}$
No indicator is used to determine the endpoint because $K M n O_{4}$ itself acts as the indicator. Permanganate $(M n O_{4}^{-})$ ion has a dark purple color. In an acidic medium, $M n O_{4}^{-}$ is reduced to colourless manganous $(M n^{2 +})$ ions.

At the end point, the addition of the single drop of permanganate imparts a light pink color to the solution.

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