Chemistry · Science General

Separation Techniques

813 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

Alcohol and water are easily separated by distillation because of their

  1. different boiling points

  2. different colours

  3. different densities

  4. all of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Alcohol and water are easily separated by distillation because of their different boiling points. Moreover, distillation is used to separate a mixture of two liquids having different boiling points.

Multiple choice

Sodium chloride can be separated from sand by first adding water to the mixture to dissolve the sodium chloride. The separation then takes place in two stages, which are

  1. filtration followed by decantation

  2. distillation followed by decantation

  3. filtration followed by evaporation

  4. evaporation followed by filtration
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Firstly, sand is separated from the mixture by filtration. Then, by evaporation, water gets evaporated and sodium chloride is left behind.

Multiple choice

A chalk which is settled at the bottom of a beaker filled with water can be separated from the water by ________ and __. The chalk can then be dried by ___. (a) sedimentation and crystallisation; condensation (b) decantation and filtration, evaporation (c) filtration and evaporation; crystallisation

  1. Only (a)

  2. Only (b)

  3. Only (b) and (c)

  4. Only (c)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Some chalk powder settled at the bottom of a beaker filled with water can be separated from water by decantation and filtration. The chalk powder can then be dried out by evaporation. 

Multiple choice

Which of the following liquid - liquid mixtures cannot be separated by a separating funnel?

  1. Benzene and water
  2. Kerosene oil and water
  3. Ethyl alcohol and water
  4. Acetone and ethyl alcohol

  1. 1 and 2

  2. 3 and 4

  3. 1 and 3

  4. 2 and 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Separating funnel is used to separate a mixture of immiscible liquids. Only the mixtures in options 1 and 2 can be separated by using a separating funnel as they are mixtures of immiscible liquids. The mixtures in options 3 and 4 cannot be separated by a separating funnel because they are mixtures of miscible liquids.

Multiple choice

Consider the information given below about methods of separation, types of mixtures and nature of mixtures. Which of the following is/are incorrectly matched?

     
S. No. Method Type of mixture Nature of mixture
1. Magnetic separation Solid-Solid Heterogeneous
2. Fractional distillation Liquid-Solid Heterogeneous
3. Separating funnel Liquid-Liquid Heterogeneous
4. Filtration Liquid-Liquid Heterogeneous

  1. Only 1

  2. Both 2 and 3

  3. Both 2 and 4

  4. Only 2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fractional distillation is used to separate miscible liquids having different boiling points. Filtration is used to separate a heterogeneous mixture of solid and liquid.

Multiple choice

Different properties of three processes P, Q and R are given in the table below. Identify the processes by choosing the correct code from the given alternatives.

 
Processes Properties
P Used to separate suspended particles from water
Q Used to separate immiscible liquids
R Used to separate a mixture of NaCl and water

  1. P – Filtration, Q – Separating funnel, R – Distillation

  2. P – Distillation, Q – Filtration, R – Separating funnel

  3. P – Sedimentation, Q – Filtration, R – Chromatography

  4. P – Sublimation, Q – Separating funnel, R – Distillation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

P - It is filtration method which is used to separate suspended particles from water. Q - A separating funnel is used in liquid-liquid extractions to separate (partition) the components of a mixture into two immiscible solvent phases of different densities. R - It is distillation method which is used to separate a mixture of NaCl and water.

Multiple choice

Which of the following statements is/are false?

a. The choice of the method of separation depends upon the nature and the properties of its constituents. b. Salt or sugar as well as water retain their individual properties in solution form. c. The method of hand-picking is used to remove unwanted particles from a mixture in which components are present in a large quantity.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option.