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40 ml gaseous mixture of CO, CH(4) and N...

40 ml gaseous mixture of CO, `CH_(4)` and Ne was exploded with 10 ml of oxygen. On cooling, the gases occupied 36.5 ml. After treatment with KOH the volume reduced by 9 ml and again on treatment with alkaline pyrogallol, the volume further reduced, percentage of `CH_(4)` in the original mixture is

A

22.5

B

77.5

C

7.5

D

15

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The correct Answer is:
D
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