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  4. Which of the following gas molecules have equal total kinetic energy and translational kinetic energy?

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Q. Which of the following gas molecules have equal total kinetic energy and translational kinetic energy?

AIIMSAIIMS 1996States of Matter

Solution:

The total kinetic energy of a molecule is the sum of its translational, vibrational and rotational kinetic energies. The monoatomic molecules do not possess vibrational and rotational kinetic energies. Hence noble gases (like $He, Ar$ etc) fulfill the criteria.