Purification of organic compounds

Which of the following is not a common method used for purification?

• a) Sublimation

• b) Crystallisation

• c) Electrolysis

• d) Chromatography

Crystallisation is based on the ____________

• a) Difference in melting point

• b) Difference in boiling point

• c) Difference in pressure

• d) Difference in solubility

Insoluble impurities from solution during crystallization are removed by ____________

• a) Drying

• b) Filtration

• c) Heating

• d) Cooling

The nature of the crystallization process is governed by _____________

• a) Thermodynamics

• b) Kinetic factors

• c) Thermodynamics and Kinetic factors

• d) None of the mentioned

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

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

Steam distillation process is used to separate substances which are ____________

• a) Steam volatile

• b) Steam volatile and immiscible with water

• c) Steam volatile and miscible with water

• d) All of the mentioned

The organic liquid in steam distillation vaporizes at ____________

• a) Lower temperature than its boiling point

• b) Higher temperature than its boiling point

• c) At its boiling point

• d) None of the mentioned

Used to separate an insoluble solid from liquid or soluble solid

• Filtration

• Distillation

• Crystallisation

• Evaporation

Used to separate a dissolved solid from its solution

• Filtration

• Evaporation

• Crystallisation

• Sublimation