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An unknown gaseous hydrocarbon and oxyge...

An unknown gaseous hydrocarbon and oxygen gas are mixed in volume ratio `1:7` respectively and exploded. The resulting mixture upon cooling occupied a volume of `V mL`, half of which got absorbed in aq. `KOH` (absorbed `CO_(2)`) and the remaining half was absorbed in alkaline pyrogallol solution (absorbs `O_(2)`) . Assuming all volumes to be measured under identical conditions :

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