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12 . kinetic theory of gases — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics12 . kinetic theory of gases1 Mark
MCQ
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
    ${V_N} > {V_O} > {V_H}$
  • ✓
    ${V_H} > {V_N} > {V_O}$
  • C
    ${V_O} = {V_N} = {V_H}$
  • D
    ${V_O} > {V_H} > {V_N}$
✓

Answer

Correct option: B.
${V_H} > {V_N} > {V_O}$
b
${v_{rms\,}} \propto \frac{1}{{\sqrt M }}$

$\Rightarrow$ ${V_H} < {V_N} < {V_O}$     ($\because$ ${M_H} < {M_N} < {M_O}$)

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