question_answer 73)

  Assertion (A): At constant temperature, pV vs V plot for real gases is not a straight line. Reason (R): At high pressure all gases have Z > 1 but at intermediate pressure most gases have Z < 1.

Answer:

  (b) PV versus V plot for real gases is straight line for ideal gases but not for real gases. At high pressure, there is positive deviation from ideal behaviour (Z < 1) but at intermediate or moderate pressure, the real gases passes negative deviation from ideal behavior (Z < 1)