Question

According to Graham’s law, the rate of diffusion of CO, O₂, N₂ and CO₂ follows the order

(a) CO = N₂ > O₂ > CO₂

(b) CO = N₂ > CO₂ > O₂

(c) O₂ > CO = N₂ > CO₂

(d) CO₂ > O₂ > CO == N₂

Answer 1

Answer is : (a) CO = N₂ > O₂ > CO₂

According to Graham’s law, rate of diffusion is inversely proportional to the square root of molar mass, i.e.

r ∝ 1/√M

Thus, rate of diffusion decrease with increase in molecular weight. Therefore, the order of rate of diffusion will be