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X ml of H2 gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical condition is

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a
10 seconds : He
b
20 seconds: O2
c
25 seconds: CO
d
55 seconds : CO2

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detailed solution

Correct option is B

r∝1M  ∵r= Volume effused  time taken =VtVt∝1M∴ for same volumes (V constant)t∝M∴t1t2=M1M2tHc=tH2MHeMH2=542=52s.tO2=t=5322=20stCO=5282=514s;tCO2=5442=522s

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