*/*_A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is?

Followed from Margule's equation

*/*_Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)??

Ordinary vapour compression cycle

Vapour compression with a reversible expansion engine

*/*_If we increase the pressure on a substance (which is at its triple point), then the triple point?

May increase or decrease ; depends on the substance

*/*_Free energy change of mixing two liquid substances is a function of the?

Concentration of the constituents only

Quantities of the constituents only

*/*_Entropy change of mixing two liquid substances depends upon the?

Quantity (i.e. number of moles)

*/*_For the reversible exothermic reaction, N‚Äö√á√á + 3H‚Äö√á√á ‚Äö√°√£ 2NH‚Äö√á√â, increase of pressure would?

Shift the equilibrium towards right

Give higher yield of NH‚Äö√á√â

*/*_Heat of reaction is?

Independent of temperature changes

Dependent on both pressure and temperature

Independent of temperature changes

*/*_Fugacity is most helpful in?

Representing actual behaviour of ideal gases

Representing actual behaviour of real gases

Representing actual behaviour of ideal gases

The study of chemical equilibria involving gases at atmospheric pressure

*/*_For an exothremic reaction?

Only enthalpy change (≈í√ÆH) is negative

Only internal energy change (≈í√ÆE) is negative

Both ≈í√ÆH and ≈í√ÆE are negative

*/*_Third law of thermodynamics is helpful in?

Prediction of the extent of a chemical reaction

Calculating absolute entropies of substances at different temperature

Evaluating entropy changes of chemical reaction

*/*_The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x‚Äö√á√Ö. x‚Äö√á√á, where A is a constant. The corresponding equation for ln y‚Äö√á√Ö, where y‚Äö√á√Ö is the activity co-efficient of component 1, is?

A . x‚Äö√á√á¬¨‚â§

*/*_In a reversible chemical reaction (where, ≈í√Æx = number of moles of products-number of moles of reactants )?

Addition of inert gas favours the forward reaction, when ≈í√Æx is positive

Pressure has no effect on equilibrium, when ≈í√Æn = 0

Addition of inert gas has no effect on the equilibrium constant at constant volume for any value of ≈í√Æx (+ ve, - ve) or zero)

*/*_The necessary and sufficient condition for equilibrium between two phases is?

The concentration of each component should be same in the two phases

The temperature of each phase should be same

The pressure should be same in the two phases

The chemical potential of each component should be same in the two phases

*/*_Mollier diagram is a plot of?

Temperature vs. internal energy

*/*_Which of the following identities can be most easily used to verify steam table data for superheated steam.?

(‚Äö√ √áT/‚Äö√ √áV)S = (‚Äö√ √áp/‚Äö√ √áS)V

(‚Äö√ √áT/‚Äö√ √áP)S = (‚Äö√ √áV/‚Äö√ √áS)P

(‚Äö√ √áP/‚Äö√ √áT)V = (‚Äö√ √áS/‚Äö√ √áV)T

(‚Äö√ √áV/‚Äö√ √áT)P = -(‚Äö√ √áS/‚Äö√ √áP)T

*/*_When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is?

Replaced by chemical potential which is more in vapour phase

469 + Mcqs in Chemical Engineering Thermodynamics in Chemical Engineering Page 3 McqOptions

101.	/_A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is?
A.	The distribution law
B.	Followed from Margule's equation
C.	A corollary of Henry's law
D.	None of these
Answer» B. Followed from Margule's equation

Discussion

102.	/_Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)??
A.	Air cycle
B.	Carnot cycle
C.	Ordinary vapour compression cycle
D.	Vapour compression with a reversible expansion engine
Answer» B. Carnot cycle

Discussion

103.	/_First law of thermodynamics deals with the?
A.	Direction of energy transfer
B.	Reversible processes only
C.	Irreversible processes only
D.	None of these
Answer» B. Reversible processes only

Discussion

104.	/_Van Laar equation deals with the activity co-efficients in?
A.	Binary solutions
B.	Ternary solutions
C.	Azeotropic mixture only
D.	None of these
Answer» B. Ternary solutions

Discussion

105.	/_If we increase the pressure on a substance (which is at its triple point), then the triple point?
A.	Increases
B.	Decreases
C.	Remains unchanged
D.	May increase or decrease ; depends on the substance
Answer» D. May increase or decrease ; depends on the substance

Discussion

106.	/_For a single component two phase mixture, the number of independent variable properties are?
A.	Two
B.	One
C.	Zero
D.	Three
Answer» C. Zero

Discussion

107.	/_A system in which there is exchange of energy but not of mass, is called a/an __________ system.?
A.	Isolated
B.	Open
C.	Insulated
D.	Closed
Answer» E.

Discussion

108.	/_Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).?
A.	Entropy
B.	Internal energy
C.	Enthalpy
D.	Gibbs free energy
Answer» E.

Discussion

109.	/_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
Answer» E.

Discussion

110.	/_For multicomponent multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.?
A.	Chemical potential
B.	Fugacity
C.	Both A and B
D.	Neither A nor B
Answer» D. Neither A nor B

Discussion

111.	/_Entropy change of mixing two liquid substances depends upon the?
A.	Molar concentration
B.	Quantity (i.e. number of moles)
C.	Both A and B
D.	Neither A nor B
Answer» D. Neither A nor B

Discussion

112.	/_The ammonia synthesis reaction represented by N‚Äö√á√á + 3H‚Äö√á√á ‚Äö√°√£ 2NH‚Äö√á√â ; ≈í√ÆH = - 22.4 kcal, is?
A.	Endothermic
B.	Exothermic
C.	Isothermal
D.	Adiabatic
Answer» C. Isothermal

Discussion

113.	/_The free energy change for a chemical reaction is given by (where, K = equilibrium constant)?
A.	RT lnK
B.	-RT lnK
C.	-R lnK
D.	T lnK
Answer» C. -R lnK

Discussion

114.	/_For the reversible exothermic reaction, N‚Äö√á√á + 3H‚Äö√á√á ‚Äö√°√£ 2NH‚Äö√á√â, increase of pressure would?
A.	Shift the equilibrium towards right
B.	Give higher yield of NH‚Äö√á√â
C.	Both B and C
D.	Neither A nor B
Answer» D. Neither A nor B

Discussion

115.	/_Which law of the thermodynamics provids basis for measuring the thermodynamic property??
A.	First law
B.	Zeroth law
C.	Third law
D.	Second law
Answer» C. Third law

Discussion

116.	/_Heat of reaction is?
A.	Dependent on pressure only
B.	Dependent on temperature only
C.	Dependent on both pressure and temperature
D.	Independent of temperature changes
Answer» D. Independent of temperature changes

Discussion

117.	/_The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.?
A.	Temperature
B.	Pressure
C.	Composition
D.	All of the above
Answer» E.

Discussion

118.	/_Mollier chart is a __________ plot.?
A.	Pressure vs enthalpy
B.	Pressure vs volume
C.	Enthalpy vs entropy
D.	Temperature vs entropy
Answer» D. Temperature vs entropy

Discussion

119.	/_Fugacity is most helpful in?
A.	Representing actual behaviour of real gases
B.	Representing actual behaviour of ideal gases
C.	The study of chemical equilibria involving gases at atmospheric pressure
D.	None of these
Answer» B. Representing actual behaviour of ideal gases

Discussion

120.	/_Specific heat of a gas for a reversible adiabatic process is?
A.	Negative
B.	Zero
C.	Infinity
D.	None of these
Answer» C. Infinity

Discussion

121.	/_An isentropic process is carried out at constant?
A.	Volume
B.	Pressure
C.	Temperature
D.	All of the above
Answer» B. Pressure

Discussion

122.	/_For an exothremic reaction?
A.	Only enthalpy change (≈í√ÆH) is negative
B.	Only internal energy change (≈í√ÆE) is negative
C.	Both ≈í√ÆH and ≈í√ÆE are negative
D.	Enthalpy change is zero
Answer» D. Enthalpy change is zero

Discussion

123.	/_Third law of thermodynamics is helpful in?
A.	Prediction of the extent of a chemical reaction
B.	Calculating absolute entropies of substances at different temperature
C.	Evaluating entropy changes of chemical reaction
D.	Both B and C
Answer» E.

Discussion

124.	/_A refrigerator works on the principle of __________ law of thermodynamics.?
A.	Zeroth
B.	First
C.	Second
D.	Third
Answer» D. Third

Discussion

125.	/_Clausius - Clayperon equation is applicable to __________ equilibrium processes.?
A.	Solid-vapor
B.	Solid-liquid
C.	Liquid-vapor
D.	All of the above
Answer» E.

Discussion

126.	/_There is a change in __________ during the phase transition.?
A.	Volume
B.	Pressure
C.	Temperature
D.	All of the above
Answer» B. Pressure

Discussion

127.	/_Enthalpy of a gas depends upon its?
A.	Temperature
B.	Mass
C.	Volume
D.	Pressure
Answer» B. Mass

Discussion

128.	/_The first law of thermodynamics is a statement of conservation of?
A.	Heat
B.	Momentum
C.	Energy
D.	Work
Answer» D. Work

Discussion

129.	/_Isentropic process means a constant __________ process.?
A.	Enthalpy
B.	Pressure
C.	Entropy
D.	None of these
Answer» D. None of these

Discussion

130.	/_At absolute zero temperature, the __________ of the gas is zero.?
A.	Pressure
B.	Volume
C.	Mass
D.	None of these
Answer» C. Mass

Discussion

131.	/_Joule-Thomson Co-efficient at any point on the inversion curve is?
A.	‚Äö√ √ª
B.	+ ve
C.	0
D.	-ve
Answer» D. -ve

Discussion

132.	/_The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x‚Äö√á√Ö. x‚Äö√á√á, where A is a constant. The corresponding equation for ln y‚Äö√á√Ö, where y‚Äö√á√Ö is the activity co-efficient of component 1, is?
A.	A . x‚Äö√á√á¬¨‚â§
B.	Ax‚Äö√á√Ö
C.	Ax‚Äö√á√á
D.	Ax‚Äö√á√Ö¬¨‚â§
Answer» B. Ax‚Äö√á√Ö

Discussion

133.	/_In a reversible chemical reaction (where, ≈í√Æx = number of moles of products-number of moles of reactants )?
A.	Addition of inert gas favours the forward reaction, when ≈í√Æx is positive
B.	Pressure has no effect on equilibrium, when ≈í√Æn = 0
C.	Addition of inert gas has no effect on the equilibrium constant at constant volume for any value of ≈í√Æx (+ ve, - ve) or zero)
D.	All of the above
Answer» E.

Discussion

134.	/_Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of?
A.	Fusion
B.	Vaporisation
C.	Transition
D.	None of these
Answer» D. None of these

Discussion

135.	/_When a system is in equilibrium for all possible processes, the differential or finite change of entropy is?
A.	< 0
B.	> 0
C.	= 0
D.	None of these
Answer» B. > 0

Discussion

136.	/_High __________ is an undesirable property for a good refrigerant.?
A.	Specific heat
B.	Latent heat of vaporisation
C.	Viscosity
D.	Specific vapor volume
Answer» D. Specific vapor volume

Discussion

137.	/_In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when?
A.	N = y = 1.4
B.	N = 0
C.	N = 1
D.	N = 1.66
Answer» D. N = 1.66

Discussion

138.	/_The necessary and sufficient condition for equilibrium between two phases is?
A.	The concentration of each component should be same in the two phases
B.	The temperature of each phase should be same
C.	The pressure should be same in the two phases
D.	The chemical potential of each component should be same in the two phases
Answer» E.

Discussion

139.	/_Free energy change at equilibrium is?
A.	Zero
B.	Positive
C.	Negative
D.	Indeterminate
Answer» B. Positive

Discussion

140.	/_Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is?
A.	Positive
B.	Negative
C.	Zero
D.	Infinity
Answer» D. Infinity

Discussion

141.	/_Mollier diagram is a plot of?
A.	Temperature vs. enthalpy
B.	Temperature vs. enthalpy
C.	Entropy vs. enthalpy
D.	Temperature vs. internal energy
Answer» D. Temperature vs. internal energy

Discussion

142.	/_One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one?
A.	Hour
B.	Day
C.	Minute
D.	Second
Answer» C. Minute

Discussion

143.	/_In any spontaneous process,?
A.	Only F decreases
B.	Only A decreases
C.	Both F and A decreases
D.	Both F and A increase
Answer» D. Both F and A increase

Discussion

144.	/_Which of the following is not an intensive property??
A.	Molar heat capacity
B.	Internal energy
C.	Viscosity
D.	None of these
Answer» C. Viscosity

Discussion

145.	/_For a given substance at a specified temperature, activity is __________ to fugacity.?
A.	Directly proportional
B.	Inversely proportional
C.	Equal
D.	None of these
Answer» B. Inversely proportional

Discussion

146.	/_A liquid under pressure greater than its vapour pressure for the temperature involved is called a __________ liquid.?
A.	Subcooled
B.	Saturated
C.	Non-solidifiable
D.	None of these
Answer» B. Saturated

Discussion

147.	/_The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.?
A.	Freezing
B.	Triple
C.	Boiling
D.	Boyle
Answer» C. Boiling

Discussion

148.	/_Which of the following identities can be most easily used to verify steam table data for superheated steam.?
A.	(‚Äö√ √áT/‚Äö√ √áV)S = (‚Äö√ √áp/‚Äö√ √áS)V
B.	(‚Äö√ √áT/‚Äö√ √áP)S = (‚Äö√ √áV/‚Äö√ √áS)P
C.	(‚Äö√ √áP/‚Äö√ √áT)V = (‚Äö√ √áS/‚Äö√ √áV)T
D.	(‚Äö√ √áV/‚Äö√ √áT)P = -(‚Äö√ √áS/‚Äö√ √áP)T
Answer» E.

Discussion

149.	/_When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is?
A.	More in vapour phase
B.	More in liquid phase
C.	Same in both the phases
D.	Replaced by chemical potential which is more in vapour phase
Answer» D. Replaced by chemical potential which is more in vapour phase

Discussion

150.	/_For the gaseous phase chemical reaction, C‚Äö√á√áH‚Äö√á√ë(g) + H‚Äö√á√áO(g) ‚Äö√º‚àë C‚Äö√á√áH‚Äö√á√ñOH(g), the equilibrium conversion does not depend on the?
A.	Steam to ethylene ratio
B.	Temperature
C.	Pressure
D.	None of these
Answer» E.

Discussion

Explore topic-wise MCQs in Chemical Engineering.

*/*_A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is?

*/*_Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)??

*/*_First law of thermodynamics deals with the?

*/*_Van Laar equation deals with the activity co-efficients in?

*/*_If we increase the pressure on a substance (which is at its triple point), then the triple point?

*/*_For a single component two phase mixture, the number of independent variable properties are?

*/*_A system in which there is exchange of energy but not of mass, is called a/an __________ system.?

*/*_Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).?

*/*_Free energy change of mixing two liquid substances is a function of the?

*/*_For multicomponent multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.?

*/*_Entropy change of mixing two liquid substances depends upon the?

*/*_The ammonia synthesis reaction represented by N‚Äö√á√á + 3H‚Äö√á√á ‚Äö√°√£ 2NH‚Äö√á√â ; ≈í√ÆH = - 22.4 kcal, is?

*/*_The free energy change for a chemical reaction is given by (where, K = equilibrium constant)?

*/*_For the reversible exothermic reaction, N‚Äö√á√á + 3H‚Äö√á√á ‚Äö√°√£ 2NH‚Äö√á√â, increase of pressure would?

*/*_Which law of the thermodynamics provids basis for measuring the thermodynamic property??

*/*_Heat of reaction is?

*/*_The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.?

*/*_Mollier chart is a __________ plot.?

*/*_Fugacity is most helpful in?

*/*_Specific heat of a gas for a reversible adiabatic process is?

*/*_An isentropic process is carried out at constant?

*/*_For an exothremic reaction?

*/*_Third law of thermodynamics is helpful in?

*/*_A refrigerator works on the principle of __________ law of thermodynamics.?

*/*_Clausius - Clayperon equation is applicable to __________ equilibrium processes.?

*/*_There is a change in __________ during the phase transition.?

*/*_Enthalpy of a gas depends upon its?

*/*_The first law of thermodynamics is a statement of conservation of?

*/*_Isentropic process means a constant __________ process.?

*/*_At absolute zero temperature, the __________ of the gas is zero.?

*/*_Joule-Thomson Co-efficient at any point on the inversion curve is?

*/*_In a reversible chemical reaction (where, ≈í√Æx = number of moles of products-number of moles of reactants )?

*/*_Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of?

*/*_When a system is in equilibrium for all possible processes, the differential or finite change of entropy is?

*/*_High __________ is an undesirable property for a good refrigerant.?

*/*_In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when?

*/*_The necessary and sufficient condition for equilibrium between two phases is?

*/*_Free energy change at equilibrium is?

*/*_Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is?

*/*_Mollier diagram is a plot of?

*/*_One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one?

*/*_In any spontaneous process,?

*/*_Which of the following is not an intensive property??

*/*_For a given substance at a specified temperature, activity is __________ to fugacity.?

*/*_A liquid under pressure greater than its vapour pressure for the temperature involved is called a __________ liquid.?

*/*_The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.?

*/*_Which of the following identities can be most easily used to verify steam table data for superheated steam.?

*/*_When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is?

*/*_For the gaseous phase chemical reaction, C‚Äö√á√áH‚Äö√á√ë(g) + H‚Äö√á√áO(g) ‚Äö√º‚àë C‚Äö√á√áH‚Äö√á√ñOH(g), the equilibrium conversion does not depend on the?

/_A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is?

/_Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)??

/_First law of thermodynamics deals with the?

/_Van Laar equation deals with the activity co-efficients in?

/_If we increase the pressure on a substance (which is at its triple point), then the triple point?

/_For a single component two phase mixture, the number of independent variable properties are?

/_A system in which there is exchange of energy but not of mass, is called a/an __________ system.?

/_Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).?

/_Free energy change of mixing two liquid substances is a function of the?

/_For multicomponent multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.?

/_Entropy change of mixing two liquid substances depends upon the?

/_The ammonia synthesis reaction represented by N‚Äö√á√á + 3H‚Äö√á√á ‚Äö√°√£ 2NH‚Äö√á√â ; ≈í√ÆH = - 22.4 kcal, is?

/_The free energy change for a chemical reaction is given by (where, K = equilibrium constant)?

/_For the reversible exothermic reaction, N‚Äö√á√á + 3H‚Äö√á√á ‚Äö√°√£ 2NH‚Äö√á√â, increase of pressure would?

/_Which law of the thermodynamics provids basis for measuring the thermodynamic property??

/_Heat of reaction is?

/_The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.?

/_Mollier chart is a __________ plot.?

/_Fugacity is most helpful in?

/_Specific heat of a gas for a reversible adiabatic process is?

/_An isentropic process is carried out at constant?

/_For an exothremic reaction?

/_Third law of thermodynamics is helpful in?

/_A refrigerator works on the principle of __________ law of thermodynamics.?

/_Clausius - Clayperon equation is applicable to __________ equilibrium processes.?

/_There is a change in __________ during the phase transition.?

/_Enthalpy of a gas depends upon its?

/_The first law of thermodynamics is a statement of conservation of?

/_Isentropic process means a constant __________ process.?

/_At absolute zero temperature, the __________ of the gas is zero.?

/_Joule-Thomson Co-efficient at any point on the inversion curve is?

/_In a reversible chemical reaction (where, ≈í√Æx = number of moles of products-number of moles of reactants )?

/_Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of?

/_When a system is in equilibrium for all possible processes, the differential or finite change of entropy is?

/_High __________ is an undesirable property for a good refrigerant.?

/_In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when?

/_The necessary and sufficient condition for equilibrium between two phases is?

/_Free energy change at equilibrium is?

/_Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is?

/_Mollier diagram is a plot of?

/_One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one?

/_In any spontaneous process,?

/_Which of the following is not an intensive property??

/_For a given substance at a specified temperature, activity is __________ to fugacity.?

/_A liquid under pressure greater than its vapour pressure for the temperature involved is called a __________ liquid.?

/_The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.?

/_Which of the following identities can be most easily used to verify steam table data for superheated steam.?

/_When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is?

/_For the gaseous phase chemical reaction, C‚Äö√á√áH‚Äö√á√ë(g) + H‚Äö√á√áO(g) ‚Äö√º‚àë C‚Äö√á√áH‚Äö√á√ñOH(g), the equilibrium conversion does not depend on the?