Kinetic Molecular Theory of Gas

IMPORTANT

Kinetic Molecular Theory of Gas: Overview

This topic covers concepts such as kinetic molecular theory of gases, postulates of kinetic theory of gases, etc.

Important Questions on Kinetic Molecular Theory of Gas

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Absolute zero is defined as the temperature

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Easily liquefiable gases show larger deviations from gas laws. Comment on this statement on the basis of kinetic molecular theory.

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Two gases A and B which do not chemically react, are taken in two 1 L containers. They are found to exert pressures P1 and P2, respectively. When the mixture of the gases A and B is taken in another 1 L container, the pressure exerted is found to be P1+P2. How can you justify this on the basis of kinetic molecular theory?

EASY
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Arrange the following relevant points in a proper sequence to explain why gases exert pressure.

1 Gas molecules are in random motion.

2 Kinetic energy of gas molecules is proportional to absolute temperature.

3 A gas is made up of tiny particles called molecules.

4 Intermolecular forces of attraction are negligible in gases.

5 During random motion, the gas molecules collide with each other.

6 During random motion, the gas molecules collide with the walls of a container.

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Which one of the following is not an assumption of kinetic theory of gases?

HARD
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At 1200 K, the most probable speed of gas “X” (molecular mass =40) is equal to the root mean square speed of gas “Y” at 1800 K. The molecular mass of gas “Y” is?

MEDIUM
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The volume of a gas and the number of molecules within that volume for three situations are (1) 2Vo and No (2) 3Vo and 3No (3) 3Vo and 9No The situations are ranked according to the mean free path (greatest first) as

MEDIUM
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According to kinetic molecular theory of gases, which of the following statements are correct?

a) The actual volume of the molecules is negligible in comparison to the empty space between them.

b) Collisions of gas molecules are inelastic.

c) At any particular time, different particles in the gas have the same speed and same kinetic energies.

d) Pressure is exerted by the gas as a result of collision of the particles with the walls of the container.

EASY
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The molecular speeds of gaseous molecules analogous to those of rifle bullets. Then why is odour of a gas not detected so fast ?

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Which is wrong according to Kinetic theory?

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According to Kinetic theory of gases, there are 

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Which is/are correct for molecular speed of gases?

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Which of the following is not correct in case of kinetic theory of gases?

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Which of the following postulate of kinetic theory of gas is responsible for deviation from ideal behaviour?

EASY
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The incorrect statement for kinetic molecular theory of gases is

MEDIUM
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In a closed flask of 5 L, 1.0 g of H2 is heated from 300 to 600 K. Which option is incorrect?

EASY
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 On applying the pressure, the intermolecular spaces can be reduced. This assumption explains the

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The theory that attempts to elucidate the behaviour of gases is known as of gases.

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Gases expand and occupy all the space available to them. Which of the following assumption explain this behaviour correctly?