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Gases deviate from the ideal gas behaviour because their molecules:

Option: 1

Possess negligible volume

Option: 2

Have forces of attraction between them

Option: 3

Are polyatomic

Option: 4

Are not attracted to one another

Answers (1)


As we learnt in Behaviour of real gas - attraction forces exist between molecules at low temperature.
Because molecules of real gases have intermolecular forces of attraction so the effective impact on the wall of the container is diminished. Pressure of real gas is reduced by \frac{a}{v^2} factor hence behaviour of real gas deviate from ideal behaviour.
Option (b) is correct

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