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Q.

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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a

158 g

b

31.6 g

c

790 g

d

62 g

answer is B.

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Detailed Solution

For One litre normal solution , Weight = Equivalent weight (Since , ) Mn+7O4-→H+Mn+2 ; E=MChange in oxidation stateIn Acidic medium , N=WE×1V(l)⇒1=WE×11E=M5 = 1585=31.6 g.

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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