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 chemistry basic analytical techniques partition coefficients solvent extraction separation methods

The methods of separation used in municipal water works are:

  1. loading, sedimentation, decantation and filtration

  2. sedimentation, filtration and distillation

  3. loading, decantation, sieving and distillation

  4. sedimentation, centrifugation and distillation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The methods used include physical processes such as filtration, sedimentation, and distillation; biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation and chlorination and the use of electromagnetic radiation such as ultraviolet light.

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

Which of the following solvents is used for separation of mixture of sand and sulphur?

  1. Water

  2. Benzene

  3. Carbon di sulphide

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

The separation is carried out by using organic solvent carbon disulphide in which sulfur is soluble. Sand is insoluble and can be filtered out. The remaining solution is exposed to atmosphere from which carbon disulphide will gradually evaporate and sulfur is recovered back from the solution.

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

Winnowing is used to seperate:

  1. homogenous solid-solidmixtures

  2. homogenous solid-liquid mixtrures

  3. heterogenous solid-liquid mixtures

  4. heterogenous 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

Sand and water are separated by the method of:

  1. sieving

  2. sublimation

  3. magnetic separation

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

As sand does not mix water. sand settles down like precipitates. so you can decant it from water. and water can be filtrated to get more clean water.

Decantation is a process for the separation of mixtures of immiscible liquids or of a liquid and a solid mixture such as a suspension.

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

In a separating funnel, organic phase is always _______ aqueous phase.

  1. Above

  2. Below

  3. Mixed together

  4. Both a and b
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A separatory funnel, also known as separation funnel, is a piece of laboratory glassware used in liquid-liquid extractions to separate (partition) the components of a mixture into two immiscible solvent phases of different densities. Most organic solvents float on top of an aqueous phase, though important exceptions are most halogenated solvents

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

X and Y are liquids with unequal densities. Which method can be employed to separate them?

  1. Centrifugation

  2. Chromatography

  3. Distillation

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

Separating funnel is an effective method where two liquids that do not dissolve very well in each other (immiscible liquids) can be separated by taking advantage of their unequal density. 

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

What seperation technique will you use for seperating:


(a) Oil from water
(b) Tea leaves from tea
(c) Wheat grains from husk

  1. a = filtration, b = Winnowing, c = Separating funnel

  2. a = Winnowing, b = filtration, c = Separating funnel

  3. a = Separating funnel, b = filtration, c = Winnowing

  4. a = Separating funnel, b = Winnowing, c = filtration
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oil and water are immiscible liquids separated by a separating funnel. Tea leaves are solid particles in a liquid, separated by filtration. Wheat grains and husk have different densities, separated by winnowing using wind.

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

A student accidentally poured a blue liquid into a beaker of water in the laboratory. The blue liquid is immiscible in water and is denser than water. What must he use to separate the 2 liquids?

  1. Filter Funnel

  2. Displacement Can

  3. Separating Funnel

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

In separating funnel two liquids are separated depending upon their relative density. The liquid which is denser settles down below which can be separated and the liquid having lower density settled above.

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

A mixture of chloroform and water taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be:

  1. chloroform

  2. water

  3. mixture of both

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As density of water is less than chloroform so upper layer will be of water while lower layer contains chloroform.

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

Which of the following is the seperation technique to seperate mercury and water?

  1. Seperating funnel

  2. Sublimation

  3. Filteration followed by evaporation

  4. Seperating funnel followed by evaporation or distillation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

We can separate them using separating funnel because the two are immiscible and mercury is denser than water.

Multiple choice chemistry pure substances and mixtures: separation of mixtures dry methods of separation process of separating components of a mixture method of separation

The constituents of a heterogeneous mixture are X, Y and Z. 
If mixture of X and Y taken separately then, X can be separated using magnetic separation from Y. If mixture Y and Z is taken then it can be separated using distillation method.

Which of the following mixture can be X, Y, Z?

  1. Iron, salt, water.

  2. Sulphur, carbon disulphide, water.

  3. Gun powder, common salt, water.

  4. Iodine, sand, alcohol.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Iron (X) is magnetic and can be separated from salt (Y). Salt (Y) and water (Z) form a solution that can be separated by distillation. This matches the description.