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

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

  1. A

    10 s for He

  2. B

    20 s for O2

  3. C

    25 s for CO

  4. D

    55 s for CO2

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    Solution:

    (R)1 Molar mass 

    R2R1=M1M2V2t2V1t1=M1M2Xt2X5=2M25t2=2M2

    Using trial and error method:

    For oxygen, M=32

    5t2=2M2t2=20sec

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