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Question

The purity of H2O2 in a given sample is 85%. Calculate the weight of impure sample of H2O2 which requires 10 mL of M5 KMnO4 solution in a titration in acidic medium.

A
2 g
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B
0.2 g
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C
0.17 g
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D
0.15 g
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Solution

The correct option is B 0.2 g
Milliequivalents of MnO4 Milliequivalents of H2O2
10×M5×5 Milliequivalents of H2O2
10 Milliequivalents Milliequivalents of H2O2
Weight of H2O2=10×103×342=0.17 g
Weight of impure H2O2=10085×0.17=0.2 g

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