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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 kB is Boltzmann constant, then its temperature will be –

(1) mv-2/7KB

(2) mv-2/6KB

(3) mv-2/5KB

(4) mv-2/3KB

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Correct option  (4)  mv2/3kB  

Explanation:

Energy of molecules = (f/2) KT

For translational (1/2) Mv2 = (3/2) kT

T = Mv2/3k

According to translational equation

Mv2/3k

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