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Q.

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: 

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a

25 s for CO

b

55 s for CO2

c

20 s for O2

d

10 s for He

answer is B.

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Detailed Solution

(R)∝1 Molar mass 

⇒R2R1=M1M2⇒V2t2V1t1=M1M2⇒Xt2X5=2M2⇒5t2=2M2

Using trial and error method:

For oxygen, M=32

⇒5t2=2M2⇒t2=20sec

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