Chemistry · Science General

Separation Techniques

842 Questions

Separation techniques involve physical methods to isolate mixtures, including distillation, filtration, and crystallization. Competitive exams frequently test these foundational concepts. Review the exact processes to enhance problem solving speed.

Distillation and evaporationCrystallization processFiltration methodsSeparating dissolved solidsChromatography and mass techniques

Separation Techniques Questions

Multiple choice

Fat can be separated from milk in a cream-separator because of

  1. cohesive force

  2. gravitational force

  3. centrifugal force

  4. centripetal force
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A cream separator uses rapid rotation to create centrifugal force, which pushes the denser components of milk (skim milk) outward, allowing the lighter fat (cream) to collect near the center.

Multiple choice

Which of the following statements is/are true? A. C6H5COOH can be extracted from water using C2H5OH. B. In column chromatography, the more highly absorbed component is eluted with less polar solvents. C. Number of replaceable OH- ions present in one molecule of a base is called its acidity.

  1. Only A

  2. Only B

  3. Only C

  4. A and B

  5. B and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct because number of replaceable hydroxyl ions present in one molecule of a base is called its acidity, is a true statement.

Multiple choice

Curdling of milk is an example of:

  1. emulsification

  2. coagulation

  3. stabilization

  4. demulsification
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Coagulation is the process by which a colloid precipitates out of a solution. The precipitation is brought about by induced aggregation. Milk is a colloidal suspension in which the particles are prevented from aggregating because they have electric charges of the same sign. When milk sugar (lactose) ferments, ions responsible for curdling are formed.

Multiple choice

An emulsion is seprated into its consistuent liquids by:

  1. emulsification

  2. stabilization

  3. coagulation

  4. demulsification
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The separation of an emulsion into its consistent liquids is called demulsification. The various methods used for demulsification are freezing, boiling, centrifugation, electrostatic precipitation or chemical methods which destroy the emulsifying agents.

Multiple choice

Freezing, boiling, centrifugation, etc methods are employed for the process of:

  1. coagulation

  2. dialysis

  3. demulsification

  4. emulsification
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The separation of an emulsion into its consistent liquids is called demulsification. The various methods used for demulsification are freezing, boiling, centrifugation, electrostatic precipitation or chemical methods which destroy the emulsifying agents.

Multiple choice

Camphor can easily be purified by the process of

  1. sublimation

  2. distillation

  3. crystallisation

  4. sedimentation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Camphor is a substance that undergoes sublimation, meaning it transitions directly from solid to gas when heated, allowing it to be purified easily.