An $HCl$ molecule has rotational, translational and vibrational motions. If the $rms$ velocity of $HCl$ molecules in its gaseous phase is $\bar v ,\,m$ is its mass and $k_B$ is Boltzmann constant, then its temperature will be
  • A$\frac{{m{\bar v ^{ 2}}}}{{3{k_B}}}$
  • B$\frac{{m{\bar v ^{  2}}}}{{7{k_B}}}$
  • C$\frac{{m{\bar v ^{  2}}}}{{5{k_B}}}$
  • D$\frac{{m{\bar v ^{  2}}}}{{6{k_B}}}$
JEE MAIN 2019, Medium
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