A mixture of CO and `CO_(2)` having a volume of 20 mL is mixed with X mL of oxygen and electrically sparked. The volume after explosion is 16 + X mL under the same conditions. What would be the residual volume if 30 mL of the original mixture is treated with aqueous NaOH?

Options

A. 12 mL
B. 10 mL
C. 9 mL
D. 8 ml

Answer

A

Explanation

`2CO+O_(2) to 2CO_(2)`, volume of `O_(2)` consumed = (20+ X)-(16+ X) = 4 mL
`"Volume of CO in 20 ml"= 2 xx 4 = 8 mL`
`"Volume of CO in 30 mL"= (8)/(20) xx 30 = 12mL` = volume of residual gas (`CO_(2)` is absorbed by NaOH)