This set of Physical Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Phase Behavior of Binary System”.
1. If the boundary of a system does not permit the transfer of matter between the system and its surroundings, the system is said to be closed.
a) True
b) False
View Answer
Explanation: The walls of the closed system allow transfer of energy as heat and as work, but not of matter, between it and its surroundings.
2. Which one of these are extensive properties?
a) Temperature
b) Specific volume
c) Density
d) Internal energy
View Answer
Explanation: Internal energy is an extensive property because it depends upon the quantity of the material in a system.
3. Which one of the following is true for Phase rule?
a) F = 4 π + N
b) F = 2 – 4 π + N
c) F = π + N
d) F = 2 – π + N
View Answer
Explanation: This rule relates the possible number of constituents and degree of freedom. It is represented as F = 2 – π + N.
4. Which one of the following is an example of continuous phase?
a) Homogenized milk
b) Solid crystals dispersed in a gas
c) Gas dispersed as bubbles in liquid
d) A liquid dispersed as droplets in another liquid which is immiscible
View Answer
Explanation: In emulsion one liquid (dispersed phase) is dispersed in another (continuous phase). For example, homogenized milk.
5. A process is reversible when its direction can be reversed.
a) False
b) True
View Answer
Explanation: A process is reversible whose direction can be reversed at any point by an infinitesimal change in external conditions.
6. Select the wrong statement for a reversible process.
a) It is frictionless
b) It is never more than differentially removed from equilibrium
c) traverses a succession of equilibrium states
d) It is not driven by forces whose imbalance is differential in magnitude
View Answer
Explanation: A process is reversible when its direction can be reversed at any point by an infinitesimal change in external conditions. It is driven by forces whose balance is differential in magnitude.
7. What is control volume?
a) The point where the saturated liquid and vapor states are identical
b) A slow process in which the system is in equilibrium
c) Equilibrium between reactants and products where their rate of reactions is equal
d) Region of space identified for analysis of an open system
View Answer
Explanation: A control volume is a region of space identified for analysis of an open system. It is separated from its surroundings by a control surface.
8. The unit of energy in SI unit is?
a) Joule/s
b) Pascal
c) Watt
d) Joule
View Answer
Explanation: Joule is the SI unit of energy. It is defined as the work done to an object when a force of one newton acts on the object in the direction of motion.
9. Why the temperature of the gas is produced?
a) Due to the repulsion of molecules
b) Due to the attraction of molecules
c) Due to the kinetic energy of molecules
d) Due to its heating value
View Answer
Explanation: It is produced by the kinetic energy of the molecules. Temperature is the measure of the average kinetic gas of the molecules.
10. Liquid can’t exist as a liquid at ____________
a) In space
b) Centre of earth
c) Vacuum
d) Zero pressure
View Answer
Explanation: At zero pressure water would boil away and evaporate or become gaseous. A liquid cannot exist as a liquid if evaporated liquid is continually removed.
Sanfoundry Global Education & Learning Series – Physical Chemistry.
To practice all areas of Physical Chemistry, here is complete set of Multiple Choice Questions and Answers.
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