9.0 mL of a mixture of `CH_4` and `C_2H_4` is mixed with 30.0 mL of `O_2` and the mixture is exploded in an eudiometer tube. On cooling, the resulting gas mixture occupy a volume of 21.0 mL. on shaking the residual gas with KOH, the volume becomes 7.0 mL. Find the volumes of `CH_4` and `C_2H_4` in the mixture
(All volumes are measured at the same temperature and pressure)

Options

A. 3 mL, 6 mL
B. 4 mL, 5 mL
C. 5 mL, 4 mL
D. 6 mL, 3 mL

Answer

B