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Q.

A volume of 10ml Hydrogen requires 25ml of air for complete combustion. The volume percentage of $N_{2}$ in air is

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a

79%

b

20%

c

5%

d

80%

answer is B.

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Detailed Solution

$2 H_{2} + O_{2} \to 2 H_{2} O$
10 ml 5ml
$V_{N_{2}} = 25 - 5 = 20 m l$
$% = \frac{20}{25} \times 100 = 80 %$

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