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25.5 g of H(2)O(2) solution on decomposi...

25.5 g of `H_(2)O_(2)` solution on decomposition gave 1.68 L of `O_(2)` at STP. The percentage strength by weight of the solution is

A

30

B

10

C

20

D

25

Text Solution

Verified by Experts

The correct Answer is:
C
`underset("34 g")(H_(2)O_(2))rarrH_(2)O+underset("16 g")((1)/(2))O_(2)`
1.68 litres sulpher of oxygen - STP - weighs
`(1.68xx32)/(22.4)=2.4g`
16g oxygen given by 34 g `H_(2)O_(2)`
2.4g oxygen given by `(2.4xx34)/(16)=5.1g`
% of `H_(2)O_(2)` by weight = `(5.1)/(25.5)xx100=20`
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