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Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u. Molecular mass of B will be
A. `25.00` u
B. `50.00` u
C. `12.25 u`
D. `6.50 `u

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Correct Answer - C
`(r_(A))/(r_(B))=sqrt((M_(B))/(M_(A)))implies (v_(A))/(t_(A))xx(t_(B))/(v_(B))=sqrt((M_(B))/(M_(B)))implies(10)/(20)=sqrt((M_(B))/(49))`
`implies (1)/(4) =(M_(B))/(49)`
`:. M_(B)=(49)/(4)=12.25`

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