AP EAMCET Engineering 23 Sep 2020 Shift 1 Paper

According to Graham's law of diffusion, "rate of diffusion is inversely proportional to the molecular mass of the gas"
r∝‌

1

M

(The molecular mass of CO2=44g/mol,SO2=64g∕mol,SO3=80g/mol and PCl5=208.5g∕mol )
Thus, the correct order of rate of diffusion is CO2>SO2>SO3>PCl3