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2022

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91. If an ideal gas has volume V at 27°C and it is heated at a constant pressure so that its volume becomes 1.5V. Then the value of final temperature will be

(a)  600°C                                 (b)  177°C (c)   817°C                                (d)  None of these Answer-b (11)

90. At what temperature volume of an ideal gas at 0°C becomes triple

(a)  546°C                                 (b)  182°C (c)   819°C                                (d)  646°C Answer-a   (11)

82. 2 gm of

O2 gas is taken at 27°C and pressure 76 cm. Of Hg. Then find out volume of gas (in litre)...

79. In Vander Waal’s equation a and b represent

[P+(a/V2)][v-b]=RT (a) Both a and b represent correction in volume (b)  Both a and b represent adhesive force between molecules...

77. For matter to exist simultaneously in gas and liquid phases

(a)  The temperature must be 0 K (b)  The temperature must be less than 0°C (c)   The temperature must be...

76. Two thermally insulated vessels 1 and 2 are filled with air at temperatures

( T1,T2) volume (V1,V2)  and pressure (P1,P2) respectively. If the valve joining the two vessels is opened, the temperature inside...

75. When a gas in a closed vessel was heated so as to increase its temperature by

5°C , there occurred an increase of 1% in its pressure. The original temperature of the gas was (a)   500...

74. A vessel is filled with an ideal gas at a pressure of 10 atmospheres and temperature

27°C. Half of the mass of the gas is removed from the vessel and temperature of the remaining gas is...

73. The rate of diffusion is

(a) Faster in solids than in liquids and gases (b)   Faster in liquids than in solids and gases (c)   Equal...

53. A vessel contains 1 mole of

O2  gas (molar mass 32) at a temperature T. The pressure of the gas is P. An identical vessel containing...

55. For ideal gas, which statement is not true

(a) It obeys Boyle’s law (b) It follows PV = RT (c) Internal energy depends on temperature only (d) It...

72. At a given volume and temperature, the pressure of a gas

(a) Varies inversely as its mass (b)   Varies inversely as the square of its mass (c)   Varies linearly as its...

71. Three containers of the same volume contain three different gases. The masses of the molecules are

m1,m2 and m3 and the number of molecules in their respective containers are N1,N2  and N3 . The gas pressure...

70. The pressure and temperature of two different gases is P and T having the volume V for each. They are mixed keeping the same volume and temperature, the pressure of the mixture will be

(a)   P / 2                                        (b)   P (c)   2P                                            (d)   4P Answer-c (8)

68. Oxygengas is filled in a vessel. If pressure is doubled, temperature becomes four times. How many times its density will become

(a)   2                                               (b)   4 (c)   1/4                             ...

69. The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

(a)  1092 K                                            (b)   273 K (c)   546°C                         ...

66. The equation of state corresponding to 8 g of

O2 is (a)   PV = 8RT                                         (b)   PV = RT/4 (c)   PV = RT             ...

65. A gas at 27°C has a volume V and pressure P. On heating its pressure is doubled and volume becomes three times. The resulting temperature of the gas will be

(a)   1800°C                                   (b)   162°C (c)   1527°C                                   (d)   600°C Answer-c (91)

64. In the relation n=(PV)/(RT),n=

(a) Number of molecules      (b)     Atomic number (c) Mass number                    (d)...

63. A balloon contains

1500 m3 of helium at 27°C  and 4 atmospheric pressure. The value of helium at -3°C  temperature and 2 atmospheric...

62. When volume of system is increased two times and temperature is decreased half of its initial temperature, then pressure becomes

(a) 2 times                         (b) 4 times (c) (1/4) times                  ...

61. A gas at

27°C temperature and 30 atmospheric pressure is allowed to expand to the atmospheric pressure. If the volume becomes 10 times...

60. The molecular weight of a gas is 44. The volume occupied by 2.2 g of this gas at 

0°Cand 2 atm pressure will be (a) 0.56 litre                   (b) 1.2 litres (c) 2.4 litres                   (d) 5.6 litres Answer-a...

59. A flask is filled with 13 gm of an ideal gas at

27°C and its temperature is raised to 52°C. The mass of the gas that has to be released to maintain...

58. One litre of Helium gas at a pressure 76 cm of Hg and temperature

27° is heated till its pressure and volume are doubled. The final temperature attained by the gas is (a) 927°C                       ...

57. Kinetic theory of gases was put forward by

(a) Einstein                    (b) Newton (c) Maxwell                    (d) Raman Answer-c (5)

56. A given mass of a gas is allowed to expand freely until its volume becomes double.

If Cb and Ca are the velocities of sound in this gas before and after expansion respectively, then Ca is...

54. 1 mole of gas occupies a volume of 100 ml at 50 mm pressure. What is the volume occupied by two moles of gas at 100 mm pressure and at same temperature

(a) 50 ml                              (b) 100 ml (c) 200 ml                       ...

67. The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be

(a)   PV=(5/32)RT                 (b)   PV=5RT (c)   PV=(5/2)RT                        (d)  PV=(5/16)RT (Where R is...

26. A gas at the temperature 250 K is contained in a closed vessel. If the gas is heated through 1K, then the percentage increase in its pressure will be

(a) 0.4%                        (b) 0.2% (c) 0.1%                         (d) 0.8% Answer-a (4)

52. A balloon contains

500m3 of helium at 27°C and 1 atmosphere pressure. The volume of the helium at – 3°C temperature and 0.5...

51. The product of the pressure and volume of an ideal gas is

(a) A constant (b) Approx. equal to the universal gas constant (c) Directly proportional to its temperature (d) Inversely proportional...

50. A sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T, the mass of each molecule is m. The expression for the density of gas is (k = Boltzmann’s constant)

(a) mkT                                (b) P/kT (c) P/kTV                           (d) Pm/kT...

49. If a given mass of gas occupies a volume of 10 cc at 1 atmospheric pressure and temperature of 100°C(373.15 K). What will be its volume at 4 atmospheric pressure; the temperature being the same

(a) 100 cc                             (b) 400 cc (c) 2.5 cc                       ...

48. We write the relation for Boyle’s law in the form PV = C when the temperature remains constant. In this relation, the magnitude of C depends upon

(a)  The nature of the gas used in the experiment (b) The magnitude of g in the laboratory (c) The...

47. The pressure P, volume V and temperature T of a gas in the jar A and the other gas in the jar B at pressure 2P, volume V/4 and temperature 2T, then the ratio of the number of molecules in the jar A and B will be

(a)    1 : 1                                (b) 1 : 2 (c) 2 : 1                 ...

46. The number of molecules in a gas at pressure

1.64×10-3 atmospheres and temperature 200 K having the volume 1 cc are (a) 6.02×1016                          (b) 2.63×1016 (c) 3.01×1019  ...

45. For one gram mol of a gas, the value of R in the equation PV = RT is nearly

(a) 2 cal/K                            (b) 10 cal/K (c) 0.2 cal/K                       ...

44. The volume of a gas at 21°C temperature and 768 mm pressure is 1 litre. If the density of the gas is 1.2 gm/litre at NTP, then its mass will be

(a)  4 gm                               (b) 4.21 gm (c) 1.13 gm                       ...

43. At NTP the mass of one litre of air is 1.293 gm. The value of specific gas constant will be

(a) 0.29 J/K-gm                    (b) 4.2 J/K–gm (c) 8.3 J/K-gm                       (d)...

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