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Question

A volume of 10 ml hydrogen requires 25 ml air for complete combustion. The volume per cent of N2 in air is __________.

A
20%
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B
80%
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C
79%
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D
5%
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Solution

The correct option is B 80%
We have combustion reaction for hydrogen is as follow

H2+12O2H2O

So for combustion of 10 ml H2, we needs 5 ml O2 and for 10 ml H2 we need 25 ml air

So in 25 ml air the oxygen volume is 5 ml

Volume of N2 in 25 ml air =255=20 ml N2

So % of N2 in air =2025×100=80%

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