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JEE Main levelSingle correct optionDifficulty 2 of 3rg112

A plot of $P V$ against $P$ for one mole of a real gas at constant temperature is

Aa horizontal straight line at all pressures
Ba straight line through the origin
Ca curve that approaches $RT$ as $P$ tends to zero
Da straight line of negative slope at all pressures

Answer: C

For an ideal gas

P V = RT

is a horizontal line. A real gas deviates (the product dips or rises with pressure) but as

P \to 0

the gas becomes ideal and

P V \to RT

. So the curve approaches

RT

at zero pressure.

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