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Question

Potassium permanganate is titrated against ferrous ammonium sulphate in acidic medium, the equivalent mass of potassium permanganate is:

A
molecular mass3
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B
molecular mass5
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C
molecular mass2
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D
molecular mass10
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Solution

The correct option is B molecular mass5
The ionic reaction involved in titration is:
MnO4+5Fe2++8H+Mn2++4H2O+5Fe3+
Since, a molecule of KMnO4 accepts 5 electrons in acid medium, its equivalent mass will be (molecular mass5).

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