1000+ Chemical Engineering Thermodynamics MCQ for IBPS Clerk [Solved]

1. A solute distributes itself between two nonmiscible 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 Margules equation
C. A corollary of Henry's law
D. None of these
Answer : A

2. The minimum number of phases that can exist in a system is
A. 0
B. 1
C. 2
D. 3
Answer : B

3. The chemical potential of a component (?i) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by
A. (?E/?n_i)_{S, v, nj}
B. (?G/?n_i)_{T, P, nj} = (?A/?ni) _{T, v, nj}
C. (?H/?n_i)_{S, P, nj}
D. All (A), (B) and (C)
Answer : D

4. The chemical potential for a pure substance is __________ its partial molal free energy.
A. More than
B. Less than
C. Equal to
D. Not related to
Answer : C

5. For multi-component 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 : C

6. Rotary lime kiln is an example of a/an __________ system.
A. Closed
B. Open
C. Isolated
D. Non-thermodynamic
Answer : B

7. The thermodynamic law, PV^y = constant, is not applicable in case of
A. Ideal compression of air
B. Free expansion of an ideal gas
C. Adiabatic expansion of steam in a turbine
D. Adiabatic compression of a perfect gas
Answer : B

8. 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
Answer : A

9. Entropy change for an irreversible process taking system and surrounding together is
A. 0
B. > 0
C. < 0
D. None of these
Answer : B

10. A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is
A. 349
B. 651
C. 667
D. 1000
Answer : A

11. Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass?
A. dE = Tds - PdV
B. dQ = C_vdT + PdV
C. dQ = C_pdT + Vdp
D. Tds = dE - PdV
Answer : A

12. Filling of gas from a high pressure cylinder into small bottles is an example of a/an __________ process.
A. Equilibrium
B. Adiabatic
C. Steady
D. Unsteady
Answer : D

13. All gases above its inversion temperature, in a throttling process will show
A. A heating effect
B. No change in temperature
C. A cooling effect
D. Either (A) or (C)
Answer : A

14. Entropy is a measure of the __________ of a system.
A. Disorder
B. Orderly behaviour
C. Temperature changes only
D. None of these
Answer : A

15. A Carnot cycle consists of the following steps:
A. Two isothermal and two isentropic
B. Two isobaric and two isothermal
C. Two isochoric and two isobaric
D. Two isothermals and two isochoric
Answer : A

16. If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the
A. Maxwell's equation
B. Clausius-Clapeyron Equation
C. Van Laar equation
D. Nernst Heat Theorem
Answer : B

17. The work done in isothermal compression compared to that in adiabatic compression will be
A. Less
B. More
C. Same
D. More or less depending upon the extent of work done
Answer : B

18. The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be
A. More
B. Less
C. Same
D. Data insufficient to predict
Answer : A

19. As the temperature is lowered towards the absolute zero, the value of ?(?F)/?T, then approaches
A. Unity
B. Zero
C. That of the heat of reaction
D. Infinity
Answer : B

20. A system is said to be isopiestic, if there is no __________ change.
A. Temperature
B. Pressure
C. Volume
D. None of these
Answer : B

21. In the reaction; N₂ + O₂ ? 2NO, increasing the pressure will result in
A. Shifting the equilibrium towards right
B. Shifting the equilibrium towards left
C. No change in equilibrium condition
D. None of these
Answer : C

22. Melting of ice exemplifies a/an
A. Adiabatic process
B. Endothermic reaction
C. Exothermic reaction
D. Process involving a chemical reaction
Answer : B

23. Co-efficient of Performance (COP) of a refrigerator is the ratio of the
A. Work required to refrigeration obtained
B. Refrigeration obtained to the work required
C. Lower to higher temperature
D. Higher to lower temperature
Answer : B

24. Internal energy change of a system over one complete cycle in a cyclic process is
A. Zero
B. +ve
C. -ve
D. Dependent on the path
Answer : A

25. Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of
A. Sublimation
B. Fusion
C. Transition
D. Vaporisation
Answer : C

26. 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 : D

27. The equation, (d log_e PA/d log_e xA) = (d log_e PA/d log_e xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.
A. Van Laar
B. Margules
C. Gibbs-Duhem
D. Gibbs-Duhem-Margules
Answer : D

28. Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K
A. 0
B. ?
C. 50
D. 100
Answer : B

29. Kopp's rule is used to calculate the heat capacity of
A. Solids
B. Liquids
C. Gases
D. All (A), (B) & (C)
Answer : A

30. For any system, what is the minimum number of degrees of freedom?
A. 0
B. 1
C. 2
D. 3
Answer : A

31. 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 cannot 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
Answer : A

32. Which of the following behaves most closely like an ideal gas?
A. He
B. N₂
C. O₂
D. H₂
Answer : A

33. For spontaneous changes in an isolated system (S = entropy)
A. ds = 0
B. ds <0
C. ds > 0
D. ds = Constant
Answer : C

34. Extensive properties of a thermodynamic system depend upon the __________ of the system.
A. Specific volume
B. Temperature
C. Mass
D. Pressure
Answer : C

35. Which of the following is not an extensive property?
A. Free energy
B. Entropy
C. Refractive index
D. None of these
Answer : C

36. C_p 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
Answer : B

37. 1st law of thermodynamics is nothing but the law of conservation of
A. Momentum
B. Mass
C. Energy
D. None of these
Answer : C

38. The internal energy of an incompressible fluid depends upon its
A. Pressure
B. Temperature
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : B

39. 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
Answer : A

40. The standard state of a gas (at a given temperature) is the state in which fugacity is equal to
A. Unity
B. Activity
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

41. For equilibrium process (i.e. reversible) in an isolated system
A. ds = 0
B. ds < 0
C. ds > 0
D. ds = Constant
Answer : A

42. The activity of an ideal gas is numerically __________ its pressure.
A. More than
B. Less than
C. Equal to
D. Data insufficient, can't be predicted
Answer : C

43. d_W and d_q are not the exact differential, because q and W are
A. State functions
B. Path functions
C. Intensive properties
D. Extensive properties
Answer : B

44. The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.
A. Temperature
B. Pressure
C. Composition
D. All (A), (B) and (C)
Answer : D

45. Which is not a refrigerant?
A. SO₂
B. NH₃
C. CCl₂F₂
D. C₂H₄Cl₂
Answer : D

46. Lenz's law results from the law of conservation of
A. Mass
B. Momentum
C. Energy
D. None of these
Answer : C

47. For a constant volume process __________ by the system is used only to increase the internal energy.
A. Heat absorbed
B. Work done
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : A

48. To obtain integrated form of Clausius-Clapeyron equation, ln (P₂/P₁) = (?H_V/R) (1/T₁ - 1/T₂) from the exact Clapeyron equation, it is assumed that the
A. Volume of the liquid phase is negligible compared to that of vapour phase
B. Vapour phase behaves as an ideal gas
C. Heat of vaporisation is independent of temperature
D. All (A), (B) & (C)
Answer : D

49. A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of P₁ and P₂. (where, P₁ and P₂ are initial and final pressures respectively)
A. Logarithmic
B. Arithmetic
C. Geometric
D. Harmonic
Answer : C

50. In the reaction, C + O₂ ? CO₂; ?H = - 94 kcal. What is the heat content (enthalpy) of O₂?
A. -94 kcal
B. > -94 kcal
C. < - 94 kcal
D. Zero
Answer : D