The ratio of rates of diffusion of two gases is 6:4. Calculate the ratio of their Molecular Weights.
A
9:4
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B
6:4
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C
4:9
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D
8:3
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Solution
The correct option is C4:9 Let the rates of diffusion of one gas ber1and another gas to be r2 and their Molecular weights be M1 and M2respectively According to Graham’s Law of diffusion r1r2=√M2M1or,64=√M2M1 or, 3616=M2M1 ∴M1M2=49 or, M1:M2=4:9