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Assetion : Equal masses of helium and ox...

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.

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.

Text Solution

Verified by Experts

The correct Answer is:
B
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.
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Knowledge Check

  • Assertion: Effusion rate of oxygen is smaller than nitrogen. Reason: Molecular size of nitrogen is smaller than oxygen.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true.

  • Equal masses of helium and oxygen are mixed in a container at 25 C^(@) . The fraction of the total pressure exerted by oxygen in the mixture of gases is

    A
    1/3
    B
    2/3
    C
    1/9
    D
    4/9

  • Assertion: The diffusion rate of oxygen is smaller than that of nitrogen under identical conditions. Reason: Molecular mass of nitrogen is smaller than that of oxygen.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If assertion is false but reason is true.