A) molecular motion ceases
B) gas becomes liquid
C) gas cannot be liquefied
D) random merino of molecules occur
Correct Answer: A
Solution :
The root mean square velocity of the molecules of a gas is directly proportional to the square root of absolute temperature (T) of gas, that is, \[{{v}_{rms}}=\sqrt{\frac{3RT}{M}}\]where R is gas constant, and M is mass. From the above relation it is evident that if absolute temperature of the gas becomes zero (T = 0) then the motion of molecules will cease \[({{v}_{rms}}=0),\]Hence according to kinetic theory absolute zero is that temperature at which the motion of all the molecules of the gas stops. NOTE: It is also clear that absolute temperature can never be negative, because \[{{v}_{rms}}\]can never be negative. Thus, no temperature is possible below the absolute zero.
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