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

(d) `P_1M_1=d_1RT, P_2M_2=d_2RT`
`:. (P_1)/(p_2)xx(M_1)/(M_2)=(d_1)/(d_2)`
`4/3xx2/3=(d_1)/(d_2) :. (d_1)/(d_2)=8/9`