1. Which of the following machines do not require a chemical separation technique?
a) The washing machine
b) Refrigerator
c) Coffee machine
d) Water cooler
Explanation: The coffee machine leaches oil from the coffee beans leaving behind the ingredients responsible for acidity and bitterness.
2. Which of the following is NOT an importance of separation process?
a) Reduces the operating cost
b) Reduces the risk of explosion
c) Reduces the probability of side reactions
d) Increases the speed of the reaction
Explanation: Separation process cannot accelerate a chemical reaction unless the byproduct is hindering the formation of product. Normally, a catalyst is used to accelerate a reaction.
3. Which of the following is NOT used to represent a chemical process?
a) Block flow diagram
b) Process-flow diagram
c) Flow chart
d) Semantic diagram
Explanation: A flow chart is used to represent a computer program and not a chemical reaction per se.
4. Which of the following separation techniques is dependent on difference in volatility?
a) Distillation
b) Crystallization
c) Magnetic separation
d) Fractional crystallization
Explanation: Distillation process is dependent on difference in volatility. Example:- Vapor pressure, Boiling point.
5. Crystallization exploits difference in which factors?
a) Specific heat
b) Boiling point
c) Melting point
d) Bubble point
Explanation: The difference in melting point in case of crystallization leads to the separation of the mixture.
6. What is the separation by polymer membrane?
a) Exploits the difference in volatility
b) Exploits the difference in diffusivity
c) Exploits the difference in flowability
d) Exploits the difference in permeability
Explanation: In a polymer membrane, only the substances which are suitable to the membrane are passed and the rest do not pass.It can be based on the pore size of the membrane.
7. Which of the following separation techniques exploits differences in electric charge and diffusivity?
a) Chromatography
b) Electrophoresis
c) Distillation
d) Liquid Chromatography
Explanation: Electrophoresis is based on the difference in the electrical charges and their diffusivity. Based on the difference in diffusivity of electrical charges, the components are separated.
8. What is the size of equipment determined by?
a) Rate of mass transfer from one phase to another
b) Rate of heat transfer from one phase to another
c) The number of reactions taking place
d) The amount of byproduct formed
Explanation: The amount of the feed i.e. the amount of mass transferred from one part of the separation process to another will determine the equipment size. More the mass transfer, larger shall be the equipment.
9. Which of the following is not an important property that governs the extent of separation?
a) Polarizability
b) Vapor pressure
c) Temperature
d) Radius of gyration
Explanation: The temperature of the feed will decide the state of the feed and in turn will decide the separation technique to be used. However it will have no effect on extent of separation.
10. Which of the following methods are to be applied to separate Oxygen rich components and Nitrogen rich components?
a) Crystallization
b) Zone melting
c) Magnetic separation
d) Distillation
Explanation: The difference between the boiling point of oxygen (-183oC) and Nitrogen (-195.8oC) is frequently large to be separated by distillation.