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Question

Van der Waals equation is applicable to :

A
Ideal gas
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B
Real gas
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C
Vapour
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D
Non-real gas
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Solution

The correct option is C Real gas
An ideal gas is a hypothetical gas whose pressure, volume and temperature behaviour is completely described by the ideal gas equation.

Actually no gas is ideal or perfect in nature. All gases are real gases. Real gases do not obey the ideal gas laws exactly under all conditions of temperature and pressure. Real gases deviate from ideal behaviour because of mainly two assumptions of "Kinetic theory of gases".

Van der Waals equation explains the behaviour of real gases.

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