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Assertion : Equal masses of helium and oxygen gases are given equal quantities of heat. The rise in temperature of helium is greater than that in the case of oxygen.
Reason: The molecular mass of oxygen is more than the molecular mass of helium.
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Reason: The molecular mass of oxygen is more than the molecular mass of helium.
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The correct answer is:
If both assertion and reason are true but reason is not the correct explanation of assertion.
Heat given to helium is totally used up in increasing the translation energy of its molecules since it is a monoatomic gas. On the other hand, in case of oxygen, which is a diatomic gas, heat is used up in increasing the translational, rotational and vibrational energies of its molecules. The rise in temperature of a gas is due to only increase in translational energy of its molecules.
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