EASY
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Assertion: For gas atom the number of degrees of freedom is 3.

Reason: CPCV=γ

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Important Questions on Kinetic Theory

EASY
A man is climbing up a spiral staircase. His degrees of freedom are
MEDIUM
Two moles of helium are mixed with n moles of hydrogen. If CpCv=32 for the mixture then the value of n is,
EASY
For a gas the value of RCv=0.4, so the gas is
(R-Universal gas constant)
EASY
A polyatomic ideal gas has 24 vibrational modes. What is the value of γ?
HARD

Using equipartition of energy, the specific heat (in J kg-1 K-1 ) of Aluminium at high temperature can be estimated to be (atomic weight of Aluminium =27)

EASY
If one mole of the polyatomic gas is having two vibrational modes and β is the ratio of molar specific heats for polyatomic gas β=CPCv then the value of β is :
EASY
The average thermal energy for a mono-atomic gas is : (kB is Boltzmann constant and T, absolute temperature)
MEDIUM

Which statements are correct about degrees of freedom?

A. A molecule with n degrees of freedom has n2 different ways of storing energy.

B. Each degree of freedom is associated with 12RT average energy per mole.

C. A monoatomic gas molecule has 1 rotational degree of freedom where as diatomic molecule has 2 rotational degrees of freedom

D. CH4 has a total to 6 degrees of freedom.

Choose the correct answer from the option given below:

EASY

Match the CpCv ratio for ideal gases with different type of molecules:

Molecule Type Cp/Cv
(A) Monoatomic (I) 7/5
(B) Diatomic rigid molecules (II) 9/7
(C) Diatomic non-rigid molecules (III) 4/3
(D) Triatomic rigid molecules (IV) 5/3
EASY
Molecules of an ideal gas are known to have three translational degrees of freedom. The gas is maintained at a temperature of T. The total internal energy, U of a mole of this gas, and the value of γ=CpCv are given, respectively, by
MEDIUM
What is the amount of heat needed to raise the temperature of the gas in a cylinder of fixed capacity (44.8 litres) that contains helium gas at standard temperature and pressure, by 15.0°C ? R=8.31 J mol-1 K-1
EASY

Question Image

Consider a gas of triatomic molecules. The molecules  are assumed to be triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is:

EASY

Given below are two statements:

Statement I: In a diatomic molecule, the rotational energy at a given temperature obeys Maxwell's distribution.

Statement II : In a diatomic molecule, the rotational energy at a given temperature equals the translational kinetic energy for each molecule.

In the light of the above statements, choose the correct answer from the options given below:

MEDIUM
A diatomic gas is heated at constant pressure, what fraction of the heat energy is used to increase the internal energy?
EASY
The average kinetic energy of a monoatomic gas molecule kept at temperature 27°C is (Boltzmann constant k=1.3×10-23JK-1)
EASY
A gas has n degrees of freedom. The ratio of specific heat of gas at constant volume to the specific heat of gas at constant pressure will be
EASY
A closed vessel contains 0.1 mole of a monoatomic ideal gas at 200 K. If 0.05 mole of the same gas at 400 K is added to it, the final equilibrium temperature (in K) of the gas in the vessel will be close to ______
MEDIUM
A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature T. Assuming the gases to be ideal and the oxygen bond to be rigid, the total internal energy (in units of RT) of the mixutre is :
EASY
The ratio of the specific heats CPCv= γ in terms of degrees of freedom (n) is given by: