The pressure of real gases is less than that of ideal gas because of

Finite size of particles

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Increase in the kinetic energy of the molecule

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Inter-molecular attraction

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Increase in the number of collisions

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Solution

The correct option is C Inter-molecular attraction
The pressure of real gases is less than that of ideal gas because the inter-molecular attraction is negligible in ideal gases. Due to the presence of inter molecular attractive forces in real gases, the frequency of collisions of gas molecules with the walls of the container decreases. Due to this, the pressure decreases.
Hence, option C is correct.

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Real gases approaches ideal gas at high temperature and low pressure because

$A$ . Inter atomic separation is large

$B$ . Size of the molecule is negligible when compared to inter atomic separation

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