A. Vapor pressure
B. Specific Gibbs free energy
C. Specific entropy
D. All (A), B. and (C)
Related Mcqs:
- Trouton’s ratio is given by (where λb, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol Tb = normal boiling point, °K) ___________________?
A. λb/Tb
B. Tb/λb
C. √(λb/Tb)
D. √(Tb/λb) - Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to ________________ boiling ?
A. Film
B. Nucleate
C. Transition
D. All modes of - “The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?
A. Raoult’s
B. Henry’s
C. Amagat’s
D. None of these - Free energy change of mixing two liquid substances is a function of the__________________?
A. Concentration of the constituents only
B. Quantities of the constituents only
C. Temperature only
D. All A, B. and C - The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal _____________ in the two phases?
A. Potential energy
B. Intermolecular forces
C. Kinetic energy
D. Total energy - Melting of wax is accompanied with ______________ in entropy?
A. Increase
B. Decrease
C. No change
D. None of these - A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity coefficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?
A. Temperature only
B. Temperature and pressure only
C. Temperature, pressure and liquid composition xi only
D. Temperature, pressure, liquid composition xi and vapour composition yi - 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) - A liquid under pressure greater than its vapour pressure for the temperature involved is called a _____________ liquid?
A. Sub-cooled
B. Saturated
C. Non-solidifiable
D. None of these - Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of________________?
A. Mixing
B. Adsorption
C. Wetting
D. Complete wetting
