51. Colligative properties of a dilute solution are those, which depend entirely upon the
52. Viscosity of atmospheric air may be about __________ centipoise.
53. The osmotic pressure of a solution increases, if its __________ is decreased.
54. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3 . The diffusivity of aniline in air is 0.74xl0-5m2/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. The rate of evaporation of aniline is 2.97 x 10-4. Its units are
55. In osmosis through a semi-permeable membrane, diffusion of the
56. A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct ?
57. The temperature at which the second Virial co-efficient of a real gas is zero is called the
58. The hydroxyl ion (OH-) concentration in a solution having pH value 3 will be
59. Boiling point of a solution as compared to that of the corresponding solvent is
60. Real gases approach ideal behaviour at
61. The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the
62. N.T.P. corresponds to
63. During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.
64. The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies
65. The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of
66. The pressure of 'V' litres of a dry gas is increased from 1 to 2 kgf/cm2 at a constant temperature. The new volume will become
67. 1 torr is equivalent to
68. Roult's law is obeyed by a __________ solution.
69. At standard conditions,
N2 + 2O2 2NO2; ΔG° = 100 kJ/mole
NO + O2 2NO2; ΔG° = -35 kJ/mole
The standard free energy of formation of NO in kJ/mole is
70. pH value of an alkaline solution is
71. 1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?
72. According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.
73. Kinematic viscosity of 1 m2 /second is equivalent to __________ stokes.
74. Internal energy of a substance comprises of the __________ energy.
75. Chemical property of substance is determined by:?