chemical engineering thermodynamics for chemical chemical engineering MCQs – Page 2

Practise multiple-choice questions from chemical engineering thermodynamics for chemical chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering thermodynamics for chemical chemical engineering Mcqs

21. For a thermodynamic system containing x chemical species, the maximum number of phases that can co-exist at equilibrium is_________________?
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A. x

B. x + 2

C. x + 1

D. x + 3

22. Which of the following is not a common refrigerant ?
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A. Ammonia

B. Ethylene

C. Freon-12

D. Carbon dioxide

23. Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is________________?
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A. 1

B. ?

C. 0

D. None of these

24. Compressibility factor of a gas is___________________?
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A. Not a function of its temperature

B. Not a function of its pressure

C. Not a function of its nature

D. Unity, if it follows PV = nRT

25. Heat of formation of an element in its standard state is___________________?
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A. 0

B. 0

C. A function of pressure

26. Pick out the correct statement?
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A. Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero

B. The internal energy of an ideal gas depends only on its pressure

C. Maximum work is done under reversible conditions

D. Melting of ice involves increase in enthalpy and a decrease in randomness

27. For spontaneous changes in an isolated system (S = entropy) ___________________?
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A. ds > 0

B. ds = 0

C. ds = Constant

D. ds <0

28. The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the_________________?
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A. Statement of Vant Hoff Equation

B. None of these

C. Lewis-Randall rule

D. Le-Chateliers principle

29. Which of the following is affected by the temperature ?
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A. Free energy

B. All A, B. & C

C. Activity co-efficient

D. Fugacity

30. At a given temperature, the volume of a gas dissolved in a solvent _______________ with increase in pressure?
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A. May increase or decrease; depends on the gas

B. Decreases

C. Remains unchanged

D. Increases

31. The absolute entropy for all crystalline substances at absolute zero temperature is ____________________?
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A. Zero

B. Indeterminate

C. More than zero

D. Negative

32. A refrigerator works on the principle of _____________ law of thermodynamics?
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A. Zeroth

B. First

C. Second

D. Third

33. Enthalpy of a gas depends upon its___________________?
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A. Volume

B. Mass

C. Temperature

D. Pressure

34. A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is_________________?
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A. 667

B. 349

C. 651

D. 1000

35. Which of the following is Clausius-Clapeyron Equation for vaporisation of an ideal gas under the condition that the molar volume of liquid is negligible compared to that of the vapor ?
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A. d ln p/dt = RT2/Hvap

B. dp/dt = RT2/Hvap

C. d ln p/dt = Hvap/RT2

D. dp/dt = Hvap/RT2

36. A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by_________________?
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A. ADBB1A1A

B. P1ACBP2P1

C. ACBB1A1A

D. ACBDA

37. Requisites of a reversible process is that the ____________________?
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A. System and surroundings temperature be equal

B. Friction in the system should be absent

C. None of these

D. System and surroundings pressure be equal

38. Gibbs free energy (G) is represented by, G = H TS, whereas Helmholtz free energy, A. is given by, A = E TS. Which of the following is the Gibbs-Helmholtz equation ?
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A. [?(G/T)/?T] = (H/T2)

B. [?(A/T)/?T]V = E/T2

C. Both A. and B.

D. Neither A. nor B.

39. In a homogeneous solution, the fugacity of a component depends upon the __________________?
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A. Pressure

B. Composition

C. All (A), B. and (C)

D. Temperature

40. Chemical engineering thermodynamics is concerned with the ____________ in/of chemical processes?
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A. Calculation of rates

B. None of these

C. Energy transformation from one form to another

D. Reaction mechanism

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