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 chemistry basic analytical techniques partition coefficients solvent extraction separation methods

A mixture contains two solids A and B. Solid A is light in weight while solid B is very heavy. Their sizes are almost same. Here, A is the unwanted component. To get pure solid B, which separation method would you suggest?

  1. sieving

  2. winnowing

  3. magnetic separation

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

Winnowing is a traditional method in water air current is blown to separate particles of light weight and heavier weight.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

To separate ammonium chloride from common salt, we use:

  1. filtration

  2. sedimentation

  3. sieving

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

Sublimation is a specialized change of state when a solid substance skips the liquid phase and moves directly into the gas phase. This occurs because the substance absorbs energy so quickly from the surroundings that melting never occurs.

Ammonium chloride separated from common salt by sublimation process.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

You can use decantation to separate:

  1. two miscible liquids

  2. two immiscible liquids

  3. two metals in an alloy

  4. solid-solid mixture
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Decantation is a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a suspension. Example sand from water can be separated by decantation.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

A small boy mischievously mixed small pebbles into a bag of pulses. What method will you employ to separate the mixture?

  1. Magnetic separation

  2. Crystallisation

  3. Handpicking

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

The method in which substances in a mixture can be separated by just picking them out with the help of hand from the mixture is known as handpicking method. It is one of the various methods which are carried out in dry conditions.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

Greasy spots can be removed from clothes by:

  1. evaporation

  2. sublimation

  3. fractional distillation

  4. dissolving in a suitable solvent
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Greasy spots can be removed from clothes by dissolving them in a suitable solvent. For example, aqueous ammonia is used in laundries as a solvent for removing grease and oil stains.


Hence, option D is correct.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

Seperation of two immiscible liquids is based on :

  1. difference in the solubility of the two liquids

  2. difference in the densities of the two liquids

  3. difference in melting point of the two liquids

  4. difference in boiling point of the two liquids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Separation of two immiscible liquids is based on difference the densities of the two liquids. The method is used for separating two immiscible liquids, such as oil and water.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

Winnowing is used only for:

  1. homogeneous solid-solid mixtures

  2. homogeneous solid-liquid mixtures

  3. heterogeneous solid-liquid mixtures

  4. heterogeneous solid-solid mixtures
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In order to separate $2$ heterogenous solid,Solid mixture in which particles having different masses can be separated by winnowing.

Ex. Wind winnowing is an agricultural method developed by ancient cultures for separating grain from chaff.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

In a separating funnel, one phase is ______ and other phase is :              .

  1. Aqueous phase, organic phase

  2. Aqueous phase, inorganic phase

  3. Inorganic phase, organic phase

  4. None of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A separating funnel is used for the separation of components of a mixture between two immiscible liquid phases. One phase is the aqueous phase and the other phase is an organic solvent. This separation is based on the differences in the densities of the liquids. The liquid having more density forms the lower layer and the liquid having less density forms the upper layer.

Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

Separation of $CCl 4$ from $CS _2$ can be carried out by ______ method.

  1. fractional distillation

  2. separating funnel

  3. crystallization

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

Separation of $C{Cl} _{4}$ from $C{S} _{2}$ can be carried out by careful distillation in presence of inert gas stream thus can be carried out by separating funnel method.


Multiple choice chemistry basic analytical techniques partition coefficients solvent extraction separation methods

Two immiscible liquids are separated by?

  1. Separating funnel

  2. Fractional distillation

  3. Chromatography

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

Separating immiscible liquids is done simply using a separating funnel. The two liquids are put into the funnel and are left for a short time to settle out and form two layers. The tap of the funnel is opened and the bottom liquid is allowed to run. The two liquids are now separate.