In order to prepare one litre normal solution of KMnO₄ , how many grams of KMnO₄ are required, if the solution is used in acidic medium for oxidation

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158 g

31.6 g

790 g

62 g

answer is B.

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Detailed Solution

One liter 1N solution of KMnO₄ corresponds to 1 g equivalent.

In acid medium for oxidation, the equivalent weight of KMnO₄ is one fifth of its molecular mass.

It is $\frac{158}{5}$ = 31.6 g.
Hence, 1 g equivalent of KMnO₄ corresponds to 31.6 g.
Hence, in order to prepare one liter 1N solution of KMnO₄, 31.6 grams of KMnO₄ are required, if the solution to be used in acid medium for oxidation.

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