Chemical Engineering MCQs

6108 MCQs  (Page 564 of 611)

Attempt Chemical Engineering Quiz
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
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In any spontaneous process, the ______________ free energy decreases ?
A. Helmholtz
B. Gibbs
C. Both a. & b.
D. Neither a. nor b.
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The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)____________________?
A. V1/v2
B. V2/v1
C. V1 – v2
D. V1.v2
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Molar heat capacity of water in equilibrium with ice at constant pressure is __________ Kcal/kg mole. °K___________________?
A. 0
B. ∞
C. 50
D. 100
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The freezing point of a liquid decreases when the pressure is increased, if the liquid ____________ while freezing?
A. Contracts
B. Expands
C. Does not change in volume
D. Either (a), b. or (c)
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At the critical point of a substance____________?
A. The surface tension vanishes
B. Liquid and vapour have the same density
C. There is no distinction between liquid and vapour phases
D. All a, b. and c
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The number of degrees of freedom for an azeotropic mixture in a two component vapourliquid equilibria is/are__________________?
A. Zero
B. One
C. Two
D. Three
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For any system, what is the minimum number of degrees of freedom ?
A. 0
B. 1
C. 2
D. 3
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What is the degree of freedom for two miscible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope ?
A. 0
B. 1
C. 2
D. 3
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The expression, ΔG = nRT. ln(P2/P1), gives the free energy change______________?
A. With pressure changes at constant temperature
B. Under reversible isothermal volume change
C. During heating of an ideal gas
D. During cooling of an ideal gas
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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