Question 21 : In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?
1. Fugacity co-efficient
2. Use of equation of state
3. Activity co-efficient
4. None of these
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Question 22 : A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of
1. 1000
2. 100
3. 3
4. none of these
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Question 23 : 2 litres of nitrogen at N.T.P. weighs __________ gms.
1. 14
2. 5
3. 25
4. 28
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Question 24 : The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg. ?
1. 0.2
2. 0.6
3. 0.1
4. 0.4
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Question 25 : If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will
1. increase four times.
2. be reduced to l/4th.
3. none of these.
4. increase two times.
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Question 26 : In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is
1. independent of the temperature.
2. decreased with the increase in pressure.
3. increased with the increase in pressure.
4. unchanged by the pressure change.
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Question 27 : Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the
1. log (temperature) vs. log (vapor pressure).
2. temperature vs. log (vapor pressure).
3. vapor pressure vs. log (temperature).
4. vapor pressure vs. temperature.
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Question 28 : At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to
1. decrease in mean free path.
2. increase in molecular attraction.
3. increased collision rate among molecules.
4. increase in average molecular speed.
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Question 29 : A gas occupies a volume of 283 c.c at 10°C. If it is heated to 20°C at constant pressure, the new volume of the gas will be __________ c.c.
1. 293
2. 566
3. 283
4. 145
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Question 30 : Molality is defined as the number of gm moles of solute per __________ of solvent.
1. litre
2. kg
3. gm mole
4. gm
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