Two non-reactive monoatomic ideal gases have their atomic masses in the ratio `2:3.` The ratio of their partial pressures, when enclosed in a vessel kept at a constant temperature, is `4:3.` The ratio of their densities is

Options

A. `1 : 4`
B. `1 :2`
C. `6 :9`
D. `8 :9`

Answer

D

Explanation

`P_(1) = (rho_(1)RT)/(M_(1)) ….(i)`
`P_(2) = (rho_(2)RT)/(M_(2)) ….(ii)`
by (i) and (ii) , `(rho_(1))/(rho_(2)) = (8)/(9)`