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The purity of H(2)O(2) in a given sample...

The purity of `H_(2)O_(2)` in a given sample is 85%. The weight of impure sample of `H_(2)O_(2)` which required 10 ml of `M//5 KMnO_(4)` solution in a titration in acidic medium is 0.1 x. Find x?

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