Melting of wax is accompanied with __________ in entropy.
A. Increase
B. Decrease
C. No change
D. None of these
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Joule-Thomson co-efficient for a perfect gas is
A. Zero
B. Positive
C. Negative
D. None of these
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Activity co-efficient is a measure of the
A. Departure from ideal solution behaviour
B. Departure of gas phase from idea] gas law
C. Vapour pressure of liquid
D. None of these
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The main feature of Carnot refrigeration cycle is that, it
A. Does not need the addition of external work for its functioning
B. Transfers heat from high temperature to low temperature
C. Accomplishes the reverse effect of the heat engine
D. None of these
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Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in
A. Increased COP
B. Same COP
C. Decreased COP
D. Increased or decreased COP ; depending upon the type of refrigerant
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A refrigerator may be termed as a
A. Heat pump
B. Heat engine
C. Carnot engine
D. None of these
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In the decomposition of PCl5 represented by, PCl5 ⇋ PCl3 + Cl2 , decrease in the pressure of the system will __________ the degree of dissociation of PCl5 .
A. Increase
B. Decrease
C. Not alter
D. None of these
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The four properties of a system viz. P, V, T, S are related by __________ equation.
A. Gibbs-Duhem
B. Gibbs-Helmholtz
C. Maxwell's
D. None of these
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Melting of ice exemplifies a/an
A. Adiabatic process
B. Endothermic reaction
C. Exothermic reaction
D. Process involving a chemical reaction
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Entropy change for an irreversible process taking system and surrounding together is
A. 0
B. > 0
C. < 0
D. None of these
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The necessary condition for phase equilibrium in a multiphase system of N components is that the
A. Chemical potentials of a given component should be equal in all phases
B. Chemical potentials of all components should be same in a particular phase
C. Sum of the chemical potentials of any given component in all the phases should be the same
D. None of these
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It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.
A. The amount of work needed is path dependent
B. Work alone can not bring out such a change of state
C. The amount of work needed is independent of path
D. More information is needed to conclude anything about the path dependence or otherwise of the work needed
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Heat of formation of an element in its standard state is
A. 0
B. < 0
C. > 0
D. A function of pressure
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Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the __________ equation.
A. Gibbs-Duhem
B. Maxwell's
C. Clayperon
D. None of these
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For a single component two phase mixture, the number of independent variable properties are
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For an ideal gas, the internal energy depends upon its __________ only.
A. Molecular size
B. Temperature
C. Volume
D. Pressure
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Enthalpy 'H' is defined as
A. H = E - PV
B. H = F - TS
C. H - E = PV
D. None of these
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Entropy is a/an
A. State function
B. Macroscopic property
C. Extensive property
D. None of these
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Pick out the correct equation relating 'F' and 'A'.
A. F = A + PV
B. F = E + A
C. F = A - TS
D. F = A + TS
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Mollier chart is a __________ plot.
A. Pressure vs enthalpy
B. Pressure vs volume
C. Enthalpy vs entropy
D. Temperature vs entropy
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