20 volume `H_(2)O_(2)` solution has a strength of about

Options

A. `30%`
B. `6%`
C. `3%`
D. `10%`

Answer

B

Explanation

`because" 22.4 litre "O_(2)" at N.T.P. obtained by 68 g of "H_(2)O_(2)`
`therefore" 1 litre "O_(2)" at N.T.P. obtained by "(68)/(22.4)g" of "H_(2)O_(2)`
`therefore" 20 litre "O_(2)" at N.T.P. obtained by"`
`(68)/(22.4)xx20g" of "H_(2)O_(2)=60.71 g" of "H_(2)O_(2)`
`therefore" 1000 mL "O_(2)" at N.T.P. obtained by = 60.71 g of "H_(2)O_(2)`
`therefore" 100 mL "O_(2)" at N.T.P. obtained by"`
`=(60.71)/(1000)xx100=6.071%`