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Question

According to kinetic theory of gases, monoatomic ideal gases have

A
translational kinetic energy
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B
rotational kinetic energy
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C
vibrational kinetic energy
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D
all of the above
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Solution

The correct option is A translational kinetic energy
Molecules of a monoatomic ideal gas (atoms) can only travel in a straight path between two points and don't have rotational/vibrational K.E. Whereas in a diatomic/polyatomic gas, molecules can vibrate/rotate about different axes.

Thus, monoatomic ideal gases have only translational kinetic energy.

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