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Two gases A and B having the same volume, diffuse through a porous partition in 20

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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 mas of B will be 

(a) 50.00 u 

(b) 12.25 u 

(c) 6.50 u 

(d) 25.00 u.

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Correct option (b)

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