Chemistry Chapter 3 Entry Test MCQs
51. The effect of pressure on density of gas is explained as under:
a. Decrease in pressure results in increase in density
b. Increase in pressure causes decreases in density
c. No effect
d. Increases in pressure causes increase in density
52. Kinetic energy of gas molecules is due to
a. Vibrational motion
b. Translational motion
c. Rotational motion
d. All of these
53. Density of H2 gas at 00C is 0.5 gdm-3, the density of methane gas at same temperature would be:
a. 5.0 gdm-3
b. 0.5 gdm-3
c. 1.5 gdm-3
d. 4.0 gdm-3
54. The density of CO2 is maximum at:
a. -10oC, 2atm
b. 20oC, 2atm
c. 50oC, 1atm
d. 30oC, 1atm
55. The minimum amount of energy required to raise the temperature of one mole of a gas upto one Kelvin is equal to:
a. 6.314 J
b. 0.0821 atm.dm3
c. 8.314 Cal
d. 4 Cal
56. What volume is occupied by gas molecules at 260 0C temperature if original volume of gas is 546 cm3 at 273 K and 1 atm pressure.
a. 1092 cm3
b. 1066 cm3
c. 1000 cm3
d. 1076 cm3
57. Helium atom is twice as heavy as H2 molecule is at 298 K, the average kinetic energy of helium is
a. Four times that of hydrogen
b. Two times that of hydrogen
c. Same as that of hydrogen
d. Half that of hydrogen
58. The density of gas ‘x’ is twice than that of ‘Y’ under same conditions. If molar mass of ‘x’ is ‘M’ then the molar mass of ‘Y’ is
a. M
b. M/2
c. 4M
d. 2M
59. When the value of general gas constant ‘R’ is given as 8.314, the relevant units will be
a. J. mol-1. K-1
b. Cal, mol-1 degree-1
c. ergs.mol-1.degree-1
d. dm3 . atm mol-1. k-1
60. A gas with lowest density
a. Ne
b. NH3
c. N2
d. O2
61. Which of the following has same number of molecules at STP?
a. 1.5 moles of N2O and 22.4 dm3 of CO
b. 22g CO2 and 5.6dm3 of N2
c. 11.2 dm3 of CH4 and 0.25 moles of CO
d. 500 cm3 of NO2 and 500 cm3 of CO
62. The molar volume of N2 is maximum at
a. 0oC and 2 atm
b. 273 K and 2 atm
c. STP
d. 273oC and 1 atm
Non-Ideal Behaviour
63. Which of the following exhibits the weakest intermolecular forces?
a. He
b. NH3
c. H2O
d. HCl
64. The actual volume can be considered negligible at which of the following pressure.
a. 6atm
b. 1atm
c. 8atm
d. 4atm
65. Ideal gas obeying kinetic theory of gases can be liquefied if:
a. Not be liquefied
b. T > Tc
c. P > Pc and T < Tc
d. P > Pc
66. About the gases which deviate more from ideal behavior, which statement is correct
a. They are liquefied easily
b. They have high values of coefficient of attractions
c. Their compressibility factor is not equal to unity
d. All of the given
67. Critical temperature is the temperature above which a substance cannot be liquefied. It depends upon size, shape and intermolecular forces. The gas which has lowest critical temperature:
a. Neon
b. Hydrogen
c. Ammonia
d. Helium
68. Which of the following statement is correct according to the Vander Waal’s equation?
a. ‘a’ constant of NH3 is greater than that of N2 and b constant of NH3 is less than that of N2
b. ‘a’ and ‘b’ constant of both NH3 and N2 have greater value
c. ‘a’ constant of NH3 is smaller than that of N2 and ‘b’ constant of NH3 is more than that of N2
d. ‘a’ and ‘b’ constant of both NH3 and N2 have smaller value
69. A gas that has highest value for Vander Waals coefficient of attraction
a. H2
b. NH3
c. O2
d. CO2
70. Effective volume of molecules per mole of a gas is____ times greater than actual volume of 1 mole of gas molecules.
a. 4
b. 2
c. 5
d. 3
71. Which of the following shows strange behaviour when subjected to gradual increase in pressure at 0oC?
a. CO2
b. H2
c. He
d. All show same behaviour
72. The compressibility factor, (Z=PV/nRT) has value at which a gas shows maximum non-ideality in behaviour
a. 1.0
b. 1.5
c. 0.9
d. 1.1
73. The deviation of a real gas from ideal behaviour is maximum at
a. – 10oC and 2.0 atm
b. – 10oC and 5.0 atm
c. 0oC and 2.0 atm
d. 100oC and 2.0 atm
74. Van der Waal’s equation is reduced to general gas equation at
a. Low temperature and high pressure
b. High temperature and low-pressure
c. Low temperature and low pressure
d. High temperature and high-pressure
75. Observed pressure of gas on the walls of container is less than actual pressure due to
a. Elastic collision
b. Haphazard motion
c. Repulsive forces
d. Inter molecular attractive forces
76. Which gas show marked deviation from ideal behavior?
a. N2
b. He
c. CO2
d. H2