When dilute aqueous solutions of two salts are mixed, the process is associated with
A. Decrease in temperature
B. Increase in temperature
C. No change in temperature
D. Change in temperature which is a function of composition
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A system is said to be isopiestic, if there is no __________ change.
A. Temperature
B. Pressure
C. Volume
D. None of these
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The third law of thermodynamics states that the
A. Heat capacity of a crystalline solid is zero at absolute zero temperature
B. Heat transfer from low temperature to high temperature source is not possible without external work
C. Gases having same reduced properties behave similarly
D. None of these
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Cp of a gas at its critical temperature and pressure
A. Becomes zero
B. Becomes infinity
C. Equals 1 kcal/kmol °K
D. Equals 0.24 kcal/kmol °K
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Heat of reaction at constant volume is identified with __________ change.
A. Enthalpy
B. Internal energy
C. Either A or B
D. Neither A nor B
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Change of state namely evaportation condensation, freezing and melting is an __________ process.
A. Isothermal
B. Adiabatic
C. Isobaric
D. Isochoric
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The most important application of distribution law is in
A. Evaporation
B. Liquid extraction
C. Drying
D. Distillation
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The energy of activation of exothermic reaction is
A. Zero
B. Negative
C. Very large compared to that for en-dothermic reaction
D. Not possible to predict
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The equation Tds = dE - PdV applies to
A. Single phase fluid of varying composition
B. Single phase fluid of constant composition
C. Open as well as closed systems
D. Both B and C
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In vapour compression refrigeration system, if the evaporator temperature and the condenser temperatures are -13°C and 37°C respetively, the Carnot COP will be
A. 5.2
B. 6.2
C. 0.168
D. Data insufficient, can't be found out
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The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is
A. Less
B. More
C. Same
D. Dependent on climatic conditions
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The gas law (PV = RT) is true for an __________ change.
A. Isothermal
B. Adiabatic
C. Both A & B
D. Neither A nor B
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If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be __________ c.c.
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At 60° C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60° C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is
A. 1.572
B. 1.9398
C. 3.389
D. 4.238
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Free energy change of mixing two liquid substances is a function of the
A. Concentration of the constituents only
B. Quantities of the constituents only
C. Temperature only
D. All of the above
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For an ideal solution, the value of activity co-efficient is
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The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing.
A. Contracts
B. Expands
C. Does not change in volume
D. Either A, B or C
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A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.
A. Isolated
B. Closed
C. Open
D. None of these
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During Joule-Thomson expansion of gases
A. Enthalpy remains constant
B. Entropy remains constant
C. Temperature remains constant
D. None of these
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The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is
A. R loge 4
B. R log10 4
C. Cv log10 4
D. Cv loge 4
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