4591. In an ideal solution, the activity of a component equals its
A. Mole fraction
B. Fugacity at the same temperature and pressure
C. Partial pressure
D. None of these
✅ The correct answer is option A.
Chemical Engineering
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4592. For multicomponent 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
✅ The correct answer is option C.
4593. Fugacity is most helpful in
A. Representing actual behaviour of real gases
B. Representing actual behaviour of ideal gases
C. The study of chemical equilibria involving gases at atmospheric pressure
D. None of these
✅ The correct answer is option A.
4594. Which of the following is not a common refrigerant?
A. Freon-12
B. Ethylene
C. Ammonia
D. Carbon dioxide
✅ The correct answer is option B.
4595. Mollier diagram is a plot of
A. Temperature vs. enthalpy
B. Temperature vs. enthalpy
C. Entropy vs. enthalpy
D. Temperature vs. internal energy
✅ The correct answer is option C.
4596. For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm³ and that in vapour phase in 391.1 cm³.Fugacity of water (in kPa) at 9000 kPa will be
A. 6738.9
B. 6753.5
C. 7058.3
D. 9000
✅ The correct answer is option B.
4597. Polystyrene is a __________ plastic at room temperature.
ductile
brittle
malleable
none of these
✅ The correct answer is option B.
4598. Visco-elastic behaviour exhibited by plastics is a __________ like behaviour.
solid
liquid
combination of solid & liquid
neither solid nor liquid
✅ The correct answer is option C.
4599. Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is
nylon-66
teflon
polyester
bakelite
✅ The correct answer is option B.
4600. The process involved in converting rubber into a thin sheet or coating it on fabric is called
extrusion
mastication
calendering
vulcanisation
✅ The correct answer is option C.