MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Chemistry MCQ
Gaseous State Mcq Neet Chemistry
Quiz 2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
Real gas most closely approaches the behavior of an ideal gas at ... [ KCET 1992]
0%
a) 15 atm and 200K
0%
b) 1 atm and 273K
0%
c) 0.5 atm and 500K
0%
d) 15 atm and 500 K
Explanation
A real gas approaches the behavior of ideal gas when the pressure is low and the temperature is high Answer: (c)
Q.2
At the same temperature and pressure, which of the following gases will have the highest kinetic energy per mole
0%
a) Hydrogen
0%
b) Oxygen
0%
c) Methane
0%
d) all the same
Explanation
Kinetic energy is proportional to temperature and independent of molecular mass Answer: (d)
Q.3
The correct value of the gas constant 'R' is closed to: ... [ CBSE PMT 1993]
0%
a) 0.082 litre-atmospher K
0%
b) 0.082 litre-atmospher K-1 mol-1
0%
c) 0.082 litre-atmosphere-1 K mole-1
0%
d) 0.082 litre-1 atmosphere-1K mol
Explanation
Answer: (b)
Q.4
Which one of the following statements is not true? [ BHU 1994]
0%
a) The product of pressure and volume of fixed amount of gas in independent of temperature.
0%
b) Molecules of different gases have the same K.E. at a given temperature
0%
c) The gas constant per molecule is known as Boltzmann constant
0%
d) The gas equation is not valid at higher pressure and low temperature
Explanation
PV=constant at constant temp and hence is not independent of temperature. Answer: (a)
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]
0%
a) 4
0%
b) 2
0%
c) 1
0%
d) 1/4
Explanation
Answer: (c)
Q.6
An ideal gas obeying kinetic theory of gases can be liquefied if : ... [ CBSE PMT 1995]
0%
a) Its temperature is more than critical temperature TC
0%
b) Its pressure is more than critical pressure PC
0%
c) Its pressure is more than PC at a temperature less than TC
0%
d) It cannot be liquified at any value of P and T
Explanation
Ideal gas cannot be liquified at any value of P and T Answer: (d)
Q.7
Which of the following mixture of gases does not obey Daltons law of partial pressure?
0%
a) O2 and CO2
0%
b) N2 and O2
0%
c) Cl2 and O2
0%
d) NH3 and HCl
Explanation
Ammonia and HCl reacts with each other Answer: (d)
Q.8
The compressibility factor for an ideal gas is ... [ IIT 1997]
0%
a) 1.5
0%
b) 1.0
0%
c) 2.0
0%
d) ∞
Explanation
Answer: (b)
Q.9
Van deer Waal's constant 'a' and 'b' are related with ...... respectively [ Raj. PMT 1994]
0%
a) Attractive force and bond energy of molecules
0%
b) Volume and repulsive force of molecules
0%
c) Shape and repulsive forces of the molecules
0%
d) Attractive force and volume of the molecules
Explanation
'a' is related is attractive force and 'b' to the volume of the molecule Answer: (d)
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]
0%
a) 2
0%
b) 1/2
0%
c) 4
0%
d) 1/4
Explanation
Answer: (c)
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
0%
b) Boyle temperature
0%
c) Inversion temperature
0%
d) reduced temperature
Explanation
Answer: (b)
Q.12
Internal energy and pressure of a gas per unit volume are related as ... [ CBSE PMT 1993]
0%
b) P=(3/2) E
0%
a) P=(2/3)E
0%
c) P=(1/2)E
0%
d) P=2E
Explanation
PV = nRT n = 1 and V = 1 P = RT ....(i) Now internal energy U or E =(3/2) RT From (i), E = (3/2)P P = (2/3)E Answer: (a)
Q.13
Which of the following statement is false? [ CBSE PMT 1999]
0%
a)Gases do not have a definite shape and volume
0%
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
0%
d) Mass of the gas cannot be determined by weighing a container in which it is enclosed
Explanation
Answer: (d)
Q.14
Gas equation PV=nRT is obeyed by ... [ BHU 2000]
0%
a) only isothermal process
0%
b) only adiabatic process
0%
c) Both (a) and (b)
0%
d) None of these
Explanation
Answer: (c)
Q.15
At STP, 0.50 mol H2 gas and 1.0 mol He gas ... [ CBSE PMT 1993]
0%
a) have equal average kinetic energies
0%
b) have equal molecular speeds
0%
c) occupy equal volumes
0%
d) have equal effusion rates
Explanation
kinetic energy depends on temperature Answer: (a)
Q.16
Which of the following exhibits the weakest intermolecular force? ... [ AIIMS 2000]
0%
a) NH3
0%
b) HCl
0%
c) He
0%
d) H2O
Explanation
Helium atom, being smallest in size an having only momentary dipole induced dipole interactions have weakest van der Waal's force Answer: (c)
Q.17
Weight of 112 ml of oxygen at NTP on liquefaction would be .. [ DPMT 1984]
0%
a) 0.32 g
0%
b) 0.64 g
0%
c) 0.16 g
0%
d) 0.96 g
Explanation
22400 cc of O2=32 gm at NTP Answer: (c)
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]
0%
a) N/2
0%
b) N
0%
c) 2N
0%
d) 4N
Explanation
Under same condition of temperature and pressure equal volumes of gases contains same number of molecules. Thus molecules present in 2 L will be 2N Answer: (c)
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]
0%
a) 10 seconds: He
0%
b) 20 seconds :O2
0%
c) 25 seconds: CO
0%
d) 55 seconds: CO2
Explanation
from equation for diffusion by substituting values of molecular mass of all options , only option (b) found correctAnswer: (b)
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
0%
b) CO2
0%
c) NH3
0%
d) SO2
Explanation
760mm pressure=1 atm .From ideal gas equation, molecular weight Mo Hence gas is CO2Answer: (b)
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]
0%
a) The same as that of SO2
0%
b) ½ that of SO2
0%
c) Twice that of SO2
0%
d) One fourth that of SO2
Explanation
Under similar conditions of temp. and pressure, equal volumes contain equal number of molecules. But 1 mol of SO2=64g and 1 mole of O2=72g.weight of O2=½ of SO2Answer: (b)
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]
0%
a) 6 cm3
0%
b) 60 cm3
0%
c) 0.6 cm3
0%
d) 0.06 cm3
Explanation
Mass of 1 L steam=1000 × 0.0006=0.6g Thus mass of water=0.6gVolume of water=0.6cc ( as density is 1 gm/cc given)Same volume will be occupied by water molecules in steamAnswer: (c)
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]
0%
a) 6.02 × 1023
0%
b) 1.2 ×1024
0%
c) 3.01 ×1023
0%
d) 2.01 ×1023
Explanation
Ratio of Cp and Cv of gas 'X' is 1.4. means that the gas is diatomic. Hence 11.2L at NTP=½ ×6.02 × 6.02 × 1023=6.02 ×1023 atoms Answer: (a)
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]
0%
a) 110 K
0%
b) 173 K
0%
c) 373 K
0%
d) 273 K
Explanation
effusion rate ∝ to velocity (v) of gas Answer: (c)
Q.25
The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is ... [ IIT 1981]
0%
a) 1.086 : 1
0%
b) 1 : 1.086
0%
c) 2 : 1.086
0%
d) 1.686 : 2
Explanation
rms=1.086 (average speed) Answer: (a)
Q.26
In the ideal gas equation, the gas constant R has the dimensions of ...[ NCERT 1982]
0%
a) mole-atm/degree K
0%
b) litre mol
0%
c) litre-atm/degree K/ mole
0%
d) erg/degree K
Explanation
Answer: (c)
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]
0%
a) V mL
0%
b) V/2 mL
0%
c) 2V
0%
d) None of these
Explanation
Answer: (a)
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)
0%
b)
0%
c)
0%
d)
Explanation
From Graham's law of diffusion Answer: (d)
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
0%
b) 64 min
0%
c) 8 min
0%
d) 32 min
Explanation
Answer: (b)
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
0%
b) When V=22.4 litres
0%
c) When T=12K
0%
d) Impossible under any conditions
Explanation
PV=nRT or P=CRT, here C is moles per litre HenceAnswer: (c)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page