Assertion: A lighter gas diffuses more rapidly than heavier gas.
Reason: At a given temperature, the rate of diffusion of a gas is inversely proportional to the square root of its density.
A. If both A and R are correct and R is the correct explanation of A
B. If both A and R are correct but R is not the correct explanation of A
C. If A is correct but R is incorrect
D. If A is incorrect but R is correct
