How will you separate mixture of two gases ?

Options

A. Fractional distillation technique
B. Grahm's law
C. Osmosis
D. Chromatography

Answer

B

Explanation

Fractional distillation is used to separate a mixture of miscrible liquids which differ in their boiling points , e.g. , `(C_(6) H_(6) + CHCl_(3))`
Mixture of two gases can be separated by diffusion technique . According to Graham.s law of diffusion or effusion : At constant temperature and pressure , the rate of diffusion of a gas is inversely proportional to the square root of its density (4) or molecular mass (M) .
i.e., `r prop (1)/(sqrtd) or (1)/(sqrtM)` (at constant T and p)
`or (r_(1))/(r_(2)) = sqrt((d_(1))/(d_(2))) = sqrt((M_(2))/(M_(1))) ( M = 2 xx d)`
Thus , the lighter gas will diffuse faster and the one with higher molecular mass is left behind .
Osmosis is the simple process of movement of only solvent molecules from the region of their higher concentration to the region of the lower concentration through a semipermeable membrane .
Chromatography is used to separate a mixture of miscible liquids with differ in their rate of adsorption on the stationary phase .