A 10 ml mixture of N_2 , a alkaline & O_2 undergo combustion in eudiometry tube. There was contraction of 2 mL ,

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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 ?
A

4 ml

B

2 ml

C

0 ml

D

8 ml

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