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20 mL of a solution containing 0.2 g of ...

20 mL of a solution containing 0.2 g of impure sample of `H_(2)O_(2)` reacts with 0.316 g of `KMnO_(4)` (acidic). Calculate :
(a) Purity of `H_(2)O_(2)`
(b) Volume of dry `O_(2)` evolved at `27^(@)C` and 750 mm pressure.

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The correct Answer is:
`% H_(2)O_(2)=85; " Vol" O_(2)=124.79 mL`
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