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One of the approach to 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 molar volume for ideal and real gas respectively) . Gas corresponding `Z gt 1` have repluive tendenciesamong constituent particles due to their size factor, among constitutent particles . As the pressure is lowered or temperature is increased the value of Z approaches 1. ( reaching the ideal behaviour)
Choose the conclusions whcih are appropriate for the observation stated
image
A. All conclusions are true
B. Conclusions I,II and IV are true
C. Conclusions I,III and IV are true
D. Conclusions III and IV are true

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Correct Answer - D
(I) `Z=1 rarr ` Ideal behaviour
(II) `Z gt rarr` On applying pressure, volume decreases
(III) `Z lt 1 rarr` Gas can be easily liqueifed .
(IV) At low, `P, Z rarr 1` means gas is approaching to ideal behaviour.

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