One of the important approach to the study of real gases involves the analysis of 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 molar volume for ideal and real gas respectively). Gas corresponding `Z lt 1` have attractive forces amoung constituent particles. As the pressure is lowered or temperature is increased the value of `Z` approaches 1. (reaching the ideal behaviour)
`{:("Observation",,"Conclusion"),(I.Z =1,,I."The gas need not be showing the ideal behaviour"),(II. Zgt1,, II. "On applying pressure the gas will respond by"),(,,"increasing its volume"),(III. Z lt 1,, III. "The gas may be liquefied"),(IV. Z rarr1 "for low" P,, IV. "The gas is approaching the ideal behaviour") :}`

Options

A. All conclusions are true
B. Conclusions I, II & IV ar true
C. Conclusions I, III & IV are true
D. Conclusion III & IV are true

Answer

D