• # question_answer Densities of two gases are in the ratio 1 : 2 and their temperatures are in the ratio 2 : 1, then the ratio of their respective pressures is        [BHU 2000] A)                 1 : 1        B)                 1 : 2 C)                 2 : 1        D)                 4 : 1

$\frac{{{d}_{1}}}{{{d}_{2}}}=\frac{1}{2}$, $\frac{{{T}_{1}}}{{{T}_{2}}}=\frac{2}{1}\because \frac{{{P}_{1}}}{{{P}_{2}}}=\frac{{{V}_{2}}}{{{V}_{1}}}\times \frac{{{T}_{1}}}{{{T}_{2}}}=\frac{{{T}_{1}}.{{d}_{1}}}{{{T}_{2}}.{{d}_{2}}}$                                 $\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{2}{1}.\frac{1}{2}=\frac{1}{1}$