Question

Statement 1: The rate of diffusion(or effusion) of hydrogen gas compared with that of helium gas is $1:4$.
Statement 2: The rate of diffusion(or effusion) of gases varies inversely as the square root of the molecular mass.

Read the above both statements and choose the correct option.

• A. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.
• B. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.
• C. Statement 1 is correct but Statement 2 is not correct.
• D. Statement 1 is not correct but Statement 2 is correct.
• E. Both the Statement 1 and Statement 2 are not correct.

Answer 1

The correct option is D

Statement 1 is not correct but Statement 2 is correct.

Statement 1 is not correct but Statement 2 is correct.
Statement 1: The rate of diffusion(or effusion) of hydrogen gas compared with that of helium gas is 1.414:1
Statement 2: The rate of diffusion(or effusion) of gases varies inversely as the square root of the molecular mass.
$\frac{r_{H2}}{r_{He}}=\sqrt{\frac{M_{He}}{M_{H2}}}=\sqrt{\frac{4}{2}}=\sqrt{2}=1.414$