Two vessel separately contains two ideal gases A and B at the same temperature, the pressure of A being twice that of B. under such conditions, the density of A is found to be 1.5 times the density of B. the ratio of molecular weight of A and B is

Options

A. `1/2`
B. `2/3`
C. `3/4`
D. `2`

Answer

C

Explanation

`PV=nRTimplies P =(rho)/(M)RT`
`M = (rhoRT)/(P) implies M prop (rho)/(P)`
`(M_1)/(M_2)=3/2 xx 1/2 implies M_(1):M_(2)=3:4`.