Q.1.
Real gas most closely approaches the behavior of an ideal gas at ... [ KCET 1992]
-
11%
a) 15 atm and 200K
-
33%
b) 1 atm and 273K
-
33%
c) 0.5 atm and 500K
-
22%
d) 15 atm and 500 K
Q.2.
At the same temperature and pressure, which of the following gases will have the highest kinetic energy per mole
-
0%
a) Hydrogen
-
22%
b) Oxygen
-
11%
c) Methane
-
67%
d) all the same
Q.3.
The correct value of the gas constant 'R' is closed to: ... [ CBSE PMT 1993]
-
0%
a) 0.082 litre-atmospher K
-
50%
b) 0.082 litre-atmospher K-1 mol-1
-
25%
c) 0.082 litre-atmosphere-1 K mole-1
-
25%
d) 0.082 litre-1 atmosphere-1K mol
Q.4.
Which one of the following statements is not true? [ BHU 1994]
-
11%
a) The product of pressure and volume of fixed amount of gas in independent of temperature.
-
56%
b) Molecules of different gases have the same K.E. at a given temperature
-
22%
c) The gas constant per molecule is known as Boltzmann constant
-
11%
d) The gas equation is not valid at higher pressure and low temperature
Q.5.
The ratio between the root mean square velocity of H2 at 50 K and that of O2 at 800 K is .... [ IIT 1996]
-
29%
a) 4
-
14%
b) 2
-
14%
c) 1
-
43%
d) 1/4
Explanation
Q.6.
An ideal gas obeying kinetic theory of gases can be liquefied if : ... [ CBSE PMT 1995]
-
17%
a) Its temperature is more than critical temperature TC
-
17%
b) Its pressure is more than critical pressure PC
-
17%
c) Its pressure is more than PC at a temperature less than TC
-
50%
d) It cannot be liquified at any value of P and T
Q.7.
Which of the following mixture of gases does not obey Daltons law of partial pressure?
-
17%
a) O2 and CO2
-
33%
b) N2 and O2
-
17%
c) Cl2 and O2
-
33%
d) NH3 and HCl
Q.8.
The compressibility factor for an ideal gas is ... [ IIT 1997]
-
0%
a) 1.5
-
38%
b) 1.0
-
25%
c) 2.0
-
38%
d) ∞
Q.9.
Van deer Waal's constant 'a' and 'b' are related with ...... respectively [ Raj. PMT 1994]
-
29%
a) Attractive force and bond energy of molecules
-
29%
b) Volume and repulsive force of molecules
-
14%
c) Shape and repulsive forces of the molecules
-
29%
d) Attractive force and volume of the molecules
Q.10.
Two separate bulbs contain ideal gases A and B. The density of gas A is twice that of gas B. The molecular mass of A is half that of gas B. The two gases are at the same temperature. The ratio of pressure of A to that of gas B is ... [ BHU 1994]
-
29%
a) 2
-
57%
b) 1/2
-
14%
c) 4
-
0%
d) 1/4
Explanation
Q.11.
The temperature at which real gases obey the ideal gas laws over a wide range of pressure is called ... [ IIT 1994]
-
0%
a) Critical temperature
-
60%
b) Boyle temperature
-
40%
c) Inversion temperature
-
0%
d) reduced temperature
Q.12.
Internal energy and pressure of a gas per unit volume are related as ... [ CBSE PMT 1993]
-
20%
b) P=(3/2) E
-
60%
a) P=(2/3)E
-
20%
c) P=(1/2)E
-
0%
d) P=2E
Q.13.
Which of the following statement is false? [ CBSE PMT 1999]
-
20%
a)Gases do not have a definite shape and volume
-
20%
b) Volume of the gas is equal to the volume of the container confining the gas
-
0%
c) Confined gas exerts uniform pressure on the walls of its container in all directions
-
60%
d) Mass of the gas cannot be determined by weighing a container in which it is enclosed
Q.14.
Gas equation PV=nRT is obeyed by ... [ BHU 2000]
-
14%
a) only isothermal process
-
0%
b) only adiabatic process
-
71%
c) Both (a) and (b)
-
14%
d) None of these
Q.15.
At STP, 0.50 mol H2 gas and 1.0 mol He gas ... [ CBSE PMT 1993]
-
33%
a) have equal average kinetic energies
-
33%
b) have equal molecular speeds
-
17%
c) occupy equal volumes
-
17%
d) have equal effusion rates
Q.16.
Which of the following exhibits the weakest intermolecular force? ... [ AIIMS 2000]
-
20%
a) NH3
-
20%
b) HCl
-
60%
c) He
-
0%
d) H2O
Q.17.
Weight of 112 ml of oxygen at NTP on liquefaction would be .. [ DPMT 1984]
-
17%
a) 0.32 g
-
0%
b) 0.64 g
-
50%
c) 0.16 g
-
33%
d) 0.96 g
Q.18.
The molecular weight of O2 and SO2 are 32 and 64 respectively. If one litre of O2 and 15°C and 750mm pressure contains 'N' molecules, the number of molecules in two litres of SO2 under the same conditions of temperature and pressure will be [ MLNR 1991]
-
40%
a) N/2
-
20%
b) N
-
20%
c) 2N
-
20%
d) 4N
Q.19.
X ml of H2 gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions is .. [ IIT 1996]
-
33%
a) 10 seconds: He
-
33%
b) 20 seconds :O2
-
17%
c) 25 seconds: CO
-
17%
d) 55 seconds: CO2
Explanation
Q.20.
A gas found to have density of 1.80 gL-1 at 760 mm pressure and 27°C. The gas will be
-
0%
a) O2
-
40%
b) CO2
-
40%
c) NH3
-
20%
d) SO2
Explanation
Q.21.
A pre weighed vessel was filled with oxygen at N.T.P. and weighed. It was then evacuated, filled with SO2 at the same temperature and pressure, and again weighed. The weight of oxygen will be ...[ NCRT 1989]
-
17%
a) The same as that of SO2
-
50%
b) ½ that of SO2
-
17%
c) Twice that of SO2
-
17%
d) One fourth that of SO2
Q.22.
At 100° and 1 atm, if the density of liquid water is 1.0 gcm-3 and that of water vapour is 0.0006 g cm-3, then the volume occupied by water molecules in 1 litre of stem at that temperature is ... [ IIT 2000]
-
17%
a) 6 cm3
-
33%
b) 60 cm3
-
33%
c) 0.6 cm3
-
17%
d) 0.06 cm3
Q.23.
Ratio of Cp and Cv of gas 'X' is 1.The number of atoms of the gas 'X' present in 11.2 litres of it at N.T.P. is ... [ CBSE PMT 1989]
-
60%
a) 6.02 × 1023
-
0%
b) 1.2 ×1024
-
20%
c) 3.01 ×1023
-
20%
d) 2.01 ×1023
Q.24.
At what temperature, the rate of effusion of N2 would be 1.625 times that of SO2 at 50°C? [ CBSE PMT 1996]
-
17%
a) 110 K
-
0%
b) 173 K
-
67%
c) 373 K
-
17%
d) 273 K
Explanation
Q.25.
The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is ... [ IIT 1981]
-
20%
a) 1.086 : 1
-
40%
b) 1 : 1.086
-
40%
c) 2 : 1.086
-
0%
d) 1.686 : 2
Q.26.
In the ideal gas equation, the gas constant R has the dimensions of ...[ NCERT 1982]
-
14%
a) mole-atm/degree K
-
29%
b) litre mol
-
43%
c) litre-atm/degree K/ mole
-
14%
d) erg/degree K
Q.27.
Volume occupied by a gas at one atmospheric pressure and 0°C is V mL. Its volume at 273K will be ... [ Bihae MADT 1982]
-
17%
a) V mL
-
33%
b) V/2 mL
-
50%
c) 2V
-
0%
d) None of these
Q.28.
At constant volume and temperature conditions, the rate of diffusion DA and DB of gases A and B having densities ρA and ρB are related by expression ... [ IIT 1993]
-
0%
a)
-
60%
b)
-
20%
c)
-
20%
d)
Explanation
Q.29.
50 ml of hydrogen diffuses out through a small hole from a vessel in 20 minutes. The time needed for 40 ml of oxygen to diffuse out is ..[ CBSE PMT 1994]
-
0%
a) 12 min
-
80%
b) 64 min
-
0%
c) 8 min
-
20%
d) 32 min
Explanation
Q.30.
Under what conditions will a pure sample of an ideal gas not only exhibit a pressure of 1atm but also a concentration of 1 mole /lit? ( R=0.082 litre atm / mol deg)[ CBSE PMT 1993]
-
0%
a) At STP
-
57%
b) When V=22.4 litres
-
29%
c) When T=12K
-
14%
d) Impossible under any conditions
Explanation
