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

Which of the following is not true about chromatography?

  1. It consists of two fixed phases.

  2. It is used to purify industrial products.

  3. It identifies different constituents of a mixture.

  4. It can separate quantities of the order of microgram.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It consists of two phases. One is fixed and the other one is moving.

Multiple choice

The process of sublimation is used to separate a mixture of salt and ammonium chloride, because

  1. ammonium chloride directly changes from solid to liquid state on heating

  2. ammonium chloride directly changes from liquid to solid state on heating

  3. ammonium chloride directly changes from solid to gaseous state on heating

  4. ammonium chloride directly changes from gaseous state to solid state on heating
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is because ammonium chloride sublimes on heating.

Multiple choice

Column chromatography is the method used in purification of individual chemical compounds from a mixture of compounds where the stationary phase is placed in a vertical glass column.

Which of the following represents the trademark for adsorbent used in the column chromatography of lipids?

  1. Cetavlon

  2. Dowex

  3. Florisil

  4. Duponol

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

Florisil refers to the trademark for a magnesium silicate adsorbent used in the column chromatography of lipids.

Multiple choice

Which of the following is/are example(s) of both selective media as well as differential media?

  1. Nutrient Agar
  2. Mannitol Salt Agar
  3. MacConkey agar

  1. Only 1

  2. Only 2

  3. Only 3

  4. Only 1 and 2

  5. Only 2 and 3
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Mannitol salt agar is both a selective and differential media used for the isolation of pathogenic Staphylococci from mixed cultures. MacConkey’s Agar is both a selective and differential media. It is selective for Gram-negative bacteria and can differentiate those bacteria that have the ability to ferment lactose.

Multiple choice

Which of the following statements is true about suspensions?

  1. The solute particles can be separated by the process of filtration.

  2. Starch solution is an example of suspension.

  3. Suspension is a homogeneous mixture.

  4. Particles in a suspension do not settle down when kept undisturbed.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Suspensions are heterogeneous mixtures (i.e. having a non-uniform composition) in which particle size is more than 100 nm. Due to large size of particles, they do not pass through the pores of a filter paper and hence, can be easily separated by filtration.  

Multiple choice

By which method can you separate a mixture of NaCl and water?

  1. Sublimation

  2. Distillation

  3. Solvent extraction

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

Mixture of NaCl and water can be separated by distillation as distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation.

Multiple choice

Ultra pure substances from a liquid can be obtained by the process of

  1. Liquification

  2. Sedimentation

  3. Crystallization

  4. Centrifugation

  5. Magnetic separation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In this process, pure sample of soluble solid is obtained from its solution by reducing the temperature. In this process liquid solution of a solid is heated and then filtered. Through this, unwanted impurities are removed and then, after cooling  the filtrate in a ice bath, crystals of pure solid are fomed. This process is based on three levels-heating, filtering and cooling, so all are impurities are removed and we get ultra pure substance.