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Question

A certain volume of H2 effuses from an apparatus in one minute. The same volume of ozonised oxygen (O3 + O2) mixture took 246 sec. to effuse from apparatus under identical conditions percentage of O2 by mole in mixture is :

A
89.87%
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B
10.13%
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C
76.54%
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D
73.12%
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Solution

The correct option is A 89.87%
rH2rO3+O2=tO3+O2tH2=MO3+O2MH2

r246r60=MO3+O2M2

MO3+O2=33.62g/mol

100×33.62=48(100x)+32x

x=89.87%

Hence, the percentage of O2 by a mole in the mixture is 89.87 %

Hence, the correct option is A

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