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51.

At absolute zero temperature

A.	mass of the gas is zero	B.	volume of the gas is zero
C.	pressure of the gas is zero	D.	all a b and c

52.

If the pressure of an ideal gas contained in a closed vessel is increased by 0.4 per cent when heated through 1?C. its initial temperature must be

A.	250 K	B.	250?C
C.	2500 K	D.	25?C

53.

Which one of the following gases is nearest to an ideal gas

A.	Helium	B.	Hydrogen
C.	Oxygen	D.	Nitrogen

54.

A vessel has two compartments A and B containing H2 and O2 respectively both at one atmospheric pressure. If the wall separating the two compartments is removed

A.	the pressure will remain unchanged	B.	the pressure will increase in A
C.	the pressure will increase in B	D.	the pressure will increase both in A and B

55.

The compressibility factor (Z) of a gas is defined as

A.	the ration of the actual volume of the gas to the volume predicted by ideal-gas law	B.	the ratio of the volume predicted by ideal-gas law to the actual volume of the gas
C.	the difference between the actual volume of the gas and the volume predicted by ideal-gas law	D.	none of the above

56.

The compressibility factor (Z) of an ideal gas is always

A.	0	B.	1
C.	>1	D.	<1

57.

The compressibility factor of any gas

A.	is always less than 1	B.	is always equal to 1
C.	is always greater than 1	D.	may be less than equal to or greater than 1 depending on the nature of the gas

58.

For values of compressibility factor (Z) less than 1 the volume of a real gas

A.	is always greater than the volume predicted by ideal-gas law	B.	is always less than the volume presicated by ideal-gas law
C.	is always equal to the volume predicted by ideal gas law	D.	may be less than equal to or greater than the volume predicted by ideal-gas law depending on the nature of the gas

59.

Generalized compressibility factor chart is a plot of

A.	compressibility factor versus reduced temperature with reduced pressure as parameter	B.	compressibility factor versus reduced pressure with reduced temperature as parameter
C.	compressibility factor versus pressure with absolute temperature as parameter	D.	compressibility factor versus absolute temperature with pressure as parameter

60.

All gases have approximately the same compressibility factor at the same

A.	temperature and pressure	B.	critical temperature and critical pressure
C.	reduced temperature and reduced pressure