A sample of `H_(2)O_(2)` is labelled 10 vol. Its percentage strength will be nearly___ %.

Options

A. 3
B. 6
C. 9
D. 12

Answer

A

Explanation

10 V `H_(2)O_(2)` means 1 L of this solotion will produce 10 L `O_(2)` at STP.
`underset(68g)(2H_(2)O_(2))to2H_(2)O+underset("22.4L at STP")(O_(2))`
`because22.4" L of "O_(2)` is obtained from `H_(2)O_(2)=68g`
`because10L` of `O_(2)` will be obtained from
`therefore1000mL` of the given solution contains 30.36 g `H_(2)O_(2)` and 100 mL of the given solution contains
`(30.36xx100)/(100)=3.03gH_(2)O_(2)`
thus, % strength of `H_(2)O_(2)` is 3.03 `(~~3)`.