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Question

3.92 g of ferrous ammonium sulphate (FAS) reacts completely with 50 ml N10 KMnO4 solution. The percentage purity of the sample is:

A
50
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B
78.4
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C
80
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D
28
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Solution

The correct option is A 50
50 ml of 0.1N potassium permanganate corresponds to 50×0.11000=0.005eq.KMnO4.
Thus, 0.005 eq. FAS has reacted.
The equivalent weight of FAS is 392 g.
0.005 equivalents of FAS corresponds to 0.005×392=1.96g of FAS.
Hence, the percentage purity of FAS sample is 1.963.92×100 or 50%.

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