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Under similar conditions which of the following gases will diffuse four times as quickly as oxygen ?

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Under similar conditions which of the following gases will diffuse four times as quickly as oxygen ?
A. `He`
B. `H_(2)`
C. `N_(2)`
D. `D_(2)`
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Correct Answer - B
`(r_("gas"))/(r_(O_(2))) = sqrt((M_(O_(2)))/(M_("gas")))`
`4 = sqrt((32)/(M_("gas"))) " or " 16 = (32)/(M_("gas"))`
or `M_("gas") = (32)/(16) = 2, " i.e., " H_(2)`
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