chemical engineering MCQs – Page 423

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

8441. Extensive properties of a thermodynamic system depend upon the _____________ of the system?
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A. Temperature

B. Mass

C. Pressure

D. Specific volume

8442. The free energy change for a chemical reaction is given by (where, K = equilibrium constant)________________?
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A. -RT ln K

B. RT ln K

C. T ln K

D. -R ln K

8443. What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor ?
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A. 3

B. 1

C. 0

D. 2

8444. What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope ?
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A. 2

B. 3

C. 1

D. 0

8445. A change in state involving a decrease in entropy can be spontaneous, only if ____________________?
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A. It takes place at constant volume

B. It is exothermic

C. It is isenthalpic

D. It takes place isothermally

8446. The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is________________?
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A. (?V/?S)P = (?T/?P)S

B. (?S/?V)T = (?P/?T)V

C. (?T/?V)S = (?P/?S)V

D. (?S/?P)T = (?V/?T)P

8447. No work is done by the system, when a reaction occurs at constant__________________?
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A. None of these

B. Pressure

C. Volume

D. Temperature

8448. pH value of H2SO4 (5% concentration) is__________________?
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A. 7

B. < 7

C. > 7

D. 5

8449. Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be__________________?
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A. Data insufficient; cant be computed

B. 640

C. 580

D. 1160

8450. The total change in the enthalpy of a system is independent of the _______________________?
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A. State of combination and aggregation in the beginning and at the end of the reaction

B. Pressure and temperature

C. None of these

D. Number of intermediate chemical reactions involved

8451. A liquid under pressure greater than its vapour pressure for the temperature involved is called a _____________ liquid?
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A. Saturated

B. None of these

C. Non-solidifiable

D. Sub-cooled

8452. Equilibrium constant decreases as the temperature___________________?
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A. None of these

B. Decreases, for an exothermic reaction

C. Increases, for an exothermic reaction

D. Increases, for an endothermic reaction

8453. Entropy change for an irreversible isolated system is__________________?
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A. > 0

B. 0

C. < 0

D. ?

8454. An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is______________?
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A. 0.2528

B. 0.5

C. 0.5055

D. 0.25

8455. Change of state namely evaporation condensation, freezing and melting is an _______________ process?
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A. Isochoric

B. Isothermal

C. Adiabatic

D. Isobaric

8456. Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is__________________?
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A. 1

B. 3

C. 0

D. 2

8457. What is the value of Joule-Thomson co-efficient for an ideal gas ?
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A. ?

B. #NAME?

C. #NAME?

D. 0

8458. In a homogeneous solution, the activity co-efficient of a component depends upon the_________________?
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A. Temperature

B. Composition

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

D. Pressure

8459. The internal energy of a gas obeying P (V b) RT (where, b is a positive constant and has a constant Cv), depends upon its________________?
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A. Volume

B. Temperature

C. Pressure

D. All A, B. & C

8460. 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__________________?
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A. 1.572

B. 3.389

C. 1.9398

D. 4.238

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