Engineering Chemistry Multiple Choice Questions on “Distillation”.
1. The process of heating a liquid mixture to form vapours and then cooling the vapours to get pure component is called ____________
a) Crystallisation
b) Distillation
c) Chromatography
d) Sublimation
Answer: b
Clarification: The process of heating a liquid mixture to form vapours and then cooling the vapours to get pure component is called distillation. Distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation.
2. Porcelain pieces are put into the distillation flask to avoid ____________
a) Overheating
b) Uniform boiling
c) Bumping of the solution
d) None of the mentioned options
Answer: c
Clarification: Porcelain pieces are put into the distillation flask to avoid bumping of the solution due to uneven heating.
3. The boiling point of chloroform is ____________
a) 334 K
b) 286 K
c) 350 K
d) 298 K
Answer: a
Clarification: The boiling point of chloroform is 334 K. Chloroform is an organic compound with formula CHCl3. It is a colorless, sweet-smelling, dense liquid that is produced on a large scale as a precursor to PTFE and refrigerants.
4. The boiling point of aniline is ____________
a) 438 K
b) 370 K
c) 338 K
d) 457 K
Answer: d
Clarification: The boiling point of aniline is 457 K. Aniline is a toxic organic compound with the formula C6H5NH2.
5. How aniline and chloroform can be separated?
a) Sublimation
b) Condensation
c) Distillation
d) Evaporation
Answer: c
Clarification: Aniline and chloroform can be separated through the distillation process. Aniline is a toxic organic compound with the formula C6H5NH2. Chloroform is an organic compound with formula CHCl3. It is a colorless, sweet-smelling, dense liquid that is produced on a large scale as a precursor to PTFE and refrigerants.
6. Which of the following is not separated through distillation process?
a) Acetone and water
b) Aniline and chloroform
c) Impurities in Sea water
d) Milk and water
Answer: d
Clarification: Milk and water are not separated through the distillation process. All the other options can be separated through a distillation process.
7. Which of the following will vaporize faster?
a) Aniline
b) Chloroform
c) Water
d) Kerosene
Answer: b
Clarification: Chloroform will vaporize faster than aniline and water. Chloroform is an organic compound with formula CHCl3. It is a colorless, sweet-smelling, dense liquid that is produced on a large scale as a precursor to PTFE and refrigerants.
8. The distilled water is collected in ____________
a) Receiver
b) Adapter
c) Condenser
d) Round bottom flask
Answer: a
Clarification: The distilled water is collected in the receiver. An installation for distillation, especially of alcohol, is a distillery. The distillation equipment is still.
9. The process of distillation is used for the liquids having ____________
a) Sufficient difference in their boiling point
b) Sufficient difference in their melting point
c) Sufficient difference in their solubility
d) None of the mentioned
Answer: a
Clarification: The process of distillation is used for the liquids having a sufficient difference in their boiling point. Distillation also permits the separation of air into its components.
10. The residue in the round bottom flask is ____________
a) Volatile
b) Non volatile
c) None of the mentioned
d) Volatile & Non volatile
Answer: b
Clarification: The residue salt int he round bottom flask is non volatile in nature. The process of distillation is used for the liquids having a sufficient difference in their boiling point. Distillation also permits the separation of air into its components.