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NEET levelSingle correct optionDifficulty 1 of 3rg168

Which graph correctly represents the behaviour of an ideal gas on a plot of $Z$ versus $P$ ?

AA straight line parallel to the $P$ axis at $Z = 1$
BA straight line through the origin
CA curve with a minimum
DA curve rising steeply from $Z = 0$

Answer: A

For an ideal gas

Z = P V / n RT = 1

at every pressure, giving a horizontal line at

Z = 1

. Real gases show curves above or below this line.

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