One of the important approach of the study of real gases involves the analysis of a parameter Z called the compressibility factor `Z=(PV_(m))/(RT)` where P is pressure, `V_(m)` is molar volume ,T is absolute temperature and R is the universal gas constant .Such a relation can also be expressed as `Z=((V_(" m real"))/(V_("m ideal")))` (where `V_("m ideal")` and V_("m real")` are the moler volume for ideal and real gas respectively tendencies among constituent particles.As pressure is force among is lowered or temperature is increased the value of Z approaches ideal behaviour
Following graph represents a pressure (P) volume (V) relationship at a fixed temperature (T) for moles of a real gas.The graph has two regions masked (I) and (II). Which of the folloing option true ?

Options

A. `Zlt1` in the region (II)
B. Z = 1 in the region (II)
C. Z = 1 for the curve
D. Z approaches 1 as we move from region (II) region(I)

Answer

D