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A 20.0 mL solution containing 0.2 impure...

A 20.0 mL solution containing 0.2 impure `H_2O_2` reacts completely with 0.316 g of `KMnO_4` in acid solution . The purity of `H_2O_2` (in%) is ...........(mol .wt.of `H_2O_2=34` , mol . Wt . Of `KMnO_4 = 158` )

Text Solution

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The correct Answer is:
85
Eq. Of `H_(2)O_(2)` = Eq. Of `KMnO_(4)`
`x xx 2 = 0.316/158 xx 5`
`x = 5 xx 10^(-3)` mol
`m_(H_(2)O_(2)) = 5 xx 10^(-3) xx 34 = 0.17 g`
`%H_(2)O_(2) = 0.17/0.2 xx 100 = 85`
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