At $256 \mathrm{~K}, \mathrm{rms}$ speed of $\mathrm{SO}_2$ gas molecules is $3.16 \times 10^2 \mathrm{~ms}^{-1}$. What is the most probable velocity (in $\mathrm{ms}^{-1}$ ) of same gas at same temperature?

• A

  $2.911 \times 10^2$
• Correct answer
  B

  $2.58 \times 10^2$
• C

  $5.16 \times 10^2$
• D

  $1.29 \times 10^2$

Hence, the correct answer is option: 'B'.