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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  wil be :

(1) 12.25 u

(2) 6.50 u

(3) 25.00 u

(4) 50.00 u
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Best answer

Ans: (1) 12.25 u

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