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Q 1220278111.     A `10` ml mixture of `N_2 `, a alkaline & `O_2` undergo combustion in eudiometry tube. There was contraction of `2` mL , when residual gases are passed through `KOH` . To the remaining mixture comprising of only one gas excesses` H_2` was added & after combustion the gas produced is absorbed by water , causing a reduction in volume of `8` ml .
Volume of `O_2` remained after the first combustion `?`
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)