• # question_answer The density of a gas An is three times that of a gas B. if the molecular mass of A is M, the molecular mass of B is [CPMT 1987] A)                 3 M        B)                 $\sqrt{3}$M C)                 $M/3$                D)                 $M/\sqrt{3}$

$d\propto M$ Þ  $\frac{{{d}_{1}}}{{{d}_{2}}}=\frac{{{M}_{1}}}{{{M}_{2}}}$; $\frac{3d}{d}=\frac{M}{{{M}_{2}}}$ ; ${{M}_{2}}=\frac{M}{3}$.