Q 1146178973.     A `20 text( cm)^3` mixture of `CO, CH_4` and `He` gases was exploded by an electric discharge at room temperature with excess oxygen. The volume contraction was found to be `13.0 text( cm)^3`. A further contraction of `14.0 text( cm)^3` occurred when the residual gas was treated with `KOH` solution. Find out the composition of `CH_4` in the mixture in terms of volume percentage

A

20%

B

10%

C

50%

D

30%

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