Question

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80. A gas mixture containing 2 moles of H, and
8 moles of O2 gases was allowed to effuse
through a pinhole. The ratio of rate of effusion of
H, to O, initially will be
(1) 1:4
(2) 4:1
(3) 1:1
(4) 1:2
​

Answer 1

As rate of effusion is inversely proportional to square root of molar mass, so ratio of hydrogen to helium (when for oxygen it is one) is 4:1.