Question 31 : A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal
1. total energy.
2. intermolecular forces of attraction.
3. kinetic energy.
4. potential energy.
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Question 32 : Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the
1. bypassing
2. purging
3. recycling
4. recirculation
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Question 33 : The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the
1. phase rule
2. theoretical equations
3. experimental data
4. emperical equations
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Question 34 : Pick out the wrong statement:
1. The temperature at which a vapor is saturated is termed as the boiling point.
2. A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a 'superheated vapor'.
3. A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure.
4. The difference between the existing temperature of a vapor and its saturation temperature (i.e. dew point) is called its 'degree of superheat'.
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Question 35 : A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor.
1. saturated
2. superheated
3. none of these
4. supersaturated
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Question 36 : A bypass stream in a chemical process is useful, because it
1. increases the yield of products.
2. facilitates better control of the process.
3. improves the conversion.
4. none of these.
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Question 37 : Hess's law of constant heat summation is based on conservation of mass. It deals with
1. reaction rate
2. none of these.
3. equilibrium constant.
4. changes in heat of reaction.
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Question 38 : An azeotropic solution of two liquids has boiling point lower than either of them, when it
1. is unsaturated.
2. shows negative deviation from Raoult's law.
3. shows positive deviation from Raoult's law.
4. is saturated.
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Question 39 : What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100°C, if their vapor pressures at 100°C are 1340, 560 and 210 mmHg respectively ?
1. 78050%
2. 756.2
3. 805
4. 880.5
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Question 40 : """The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements."" This is the statement of"
1. Nearnst heat theorem
2. Kopp's rule
3. Law of Petit and Dulong
4. Trouton's rule
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