71. Real gases approach ideal behaviour at
72. Avogadro number is the number of molecules in one __________ of a gas.
73. The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are
74. 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. The temperature at which the above mixture will exert a pressure of one standard atm. is
75. Roult's law is obeyed by a __________ solution.
76. The quantity of heat required to evaporate 1 kg of a saturated liquid is called
77. Pick out the wrong statement.
78. A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is
79. The chemical nature of an element is independent of
80. The osmotic pressure of a solution increases, if its __________ is decreased.
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