Question

If $V_{H},V_{N}$ and $V_{O}$ denote the root-mean square velocities of molecules of hydrogen, nitrogen and oxygen respectively at a given temperature, then

• A. $V_{N} > V_{O} > V_{H}$
• B. $V_{H} > V_{N} > V_{O}$
• C. $V_{O} = V_{N} = V_{H}$
• D. $V_{O} > V_{H} > V_{N}$

Answer 1

Answer: (B)

$V_{H} > V_{N} > V_{O}$

Answer 2

$v_{rms} \propto \frac{1}{\sqrt{M}}$Ž$V_{H} < V_{N} < V_{O}$ ($\because M_{H} < M_{N} < M_{O}$)