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:
A$1: 4$
B$1: 2$
C$6: 9$
D$8: 9$
IIT 2013, Medium
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D$8: 9$
d $P_1=\frac{\rho_1 R T}{M_1}$
$P_2=\frac{\rho_2 R T}{M_2}$
by $(i)$ and $(ii)$
$\frac{\rho_1}{\rho_2}=\frac{8}{9}$
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