A. Zero
B. Positive
C. Negative
D. None of these
✅ The correct answer is option A.
Chemical Engineering MCQs
The fusion of a crystalline solid at its melting point to form a liquid at the same temperature is accompanied by
A. Decrease in enthalpy corresponding to evolution of heat
B. Decrease of entropy
C. Increase in enthalpy corresponding to absorption of heat
D. No change in enthalpy
✅ The correct answer is option C.
Specific/molar Gibbs free energy for a pure substance does not change during
A. Sublimation
B. Vaporisation
C. Melting
D. Either A, B or C
✅ The correct answer is option D.
Entropy is a/an
A. State function
B. Macroscopic property
C. Extensive property
D. None of these
✅ The correct answer is option D.
Joule-Thomson Co-efficient at any point on the inversion curve is
A. ∞
B. + ve
C. 0
D. -ve
✅ The correct answer is option C.
A gas can be liquified by pressure alone only, when its temperature is __________ its critical temperature.
A. Less than
B. More than
C. Equal to or higher than
D. Less than or equal to
✅ The correct answer is option D.
As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches
A. Zero
B. Unity
C. Infinity
D. An indeterminate value
✅ The correct answer is option B.
__________ does not change during phase transformation processes like sublimation, melting & vaporisation.
A. Entropy
B. Gibbs free energy
C. Internal energy
D. All of the above
✅ The correct answer is option B.
The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are
A. Zero
B. One
C. Two
D. Three
✅ The correct answer is option B.
Heat of formation of an element in its standard state is
A. 0
B. < 0
C. > 0
D. A function of pressure
✅ The correct answer is option A.