Which of the following assumptions is incorrect according to kinetic theory of gases?

Particles of a gas move in all possible directions in straight lines

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All the particles, at any particular time, have same speed and same kinetic energy

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There is no force of attraction between the particles of a gas at ordinary temperature and pressure

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The actual volume of the gas is negligible in comparison to the empty space between them

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Solution

The correct option is B All the particles, at any particular time, have same speed and same kinetic energy
Gases are made up of a large number of particles. They travel in a straight line until there take places a collision between them and an object (eg: wall of the container). They don't have any force of attraction with walls of the container. The average kinetic energy depends on the temperature of the gas.

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