Assetion : Equal masses of helium and oxygen gases are given equal quantities of heat. The rise in temperature of helium is greater thant that in case of oxygen.
Reason : The molecular mass of oxygen is more than molecular mass of helium.

Options

A. If, both Assertion and reason are ture and the Reason is the correct explanation of the Assertion.
B. If both, Assertion and reason are true but Reason is not a correct expationation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If Both, Assertion and reason are false.

Answer

B

Explanation

Here, both assertion and reason are true but reason is not correct explanation of assertion.
Heat given to helium is totally used up in increasing the translational energy of its molecules sime it is a monoatomic gas. On the other hand, in case of oxygen which is a diatomic gas, heat is used up in increasing transational , rotational and vibrational energies of its molecules. the rise in temperature of a gas is only, due to increase im transtaltional energy of its molecules.