Question

The role of diffusion of gases is governed by

• A. Graham's law
• B. Dalton's law
• C. Avogadro's law
• D. Newton's law

Hint:

Graham's law helps explain how gases with lower molar masses diffuse faster than gases with higher molar masses.

Answer 1

The Correct Option is A

Step 1: Graham's Law of Diffusion
Graham's law states that the rate of diffusion of a gas is inversely proportional to the square root of its molar mass: \[ r \propto \frac{1}{\sqrt{M}} \] where \( r \) is the rate of diffusion, and \( M \) is the molar mass of the gas.
Step 2: Why Other Options are Incorrect
Option (b) Dalton's law deals with partial pressures in a mixture of gases, not diffusion.

Option (c) Avogadro's law relates to the volume of gas and the number of moles, not the rate of diffusion.

Option (d) Newton's law pertains to mechanics, not the diffusion of gases.
Step 3: Conclusion
Thus, the diffusion of gases is governed by Graham's law.