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 physics a little effort, lot of work levers and pulleys pulley pulleys

The machine used to separate the massive particles and light particles from a mixture is

  1. At wood machine

  2. Centrifugation

  3. Filter paper

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

Centrifugation is the process of separating suspended particles from a liquid by rotating the liquid at a high speed. The mixture is taken in a closed bottle and rotated at a high speed. The heavy particles settle at the bottom while light particles remain behind. This method is used to separate cream from milk

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Glass rod are generally used to stir liquid chemicals because :

  1. it provides controlled agitation to the reaction

  2. it does not react with chemicals in the solution

  3. it has a rounded ends to support proper stirring

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A glass rod, stirring rod or stir rod is a piece of laboratory equipment used to mix chemicals and liquids for laboratory purposes. They are usually made of solid glass, about the thickness and slightly longer than a drinking straw, with rounded ends.

Since glass is a non-crystalline amorphous solid and is silica-based it does not react with chemicals in solution. 

Also, we can control the agitation as we ourselves stir the solution using glass rod.  

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

A glass rod is :

  1. an equipment used to mix chemicals and liquid for laboratory purposes

  2. an equipment used to mix solids

  3. an equipment usedto mix gases

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

A glass rod, stirring rod or stir rod is a piece of laboratory equipment used to mix chemicals and liquids for laboratory purposes. They are usually made of solid glass, about the thickness and slightly longer than a drinking straw, with rounded ends.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

Which is the best definiion of a glass rod ?

  1. It is an equipment used in Chemistry laboratory to mix chemicals and liquids

  2. It is an equipment used in Physical laboratory to mix solids and gases

  3. It is an equipment used in Biology laboratory to separate mixures

  4. It is an equipment used at our home for cleaning purposes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A glass rod, stirring rod or stir rod is a piece of laboratory equipment used to mix chemicals and liquids for laboratory purposes. It is generally found in Chemical laboratory as glass ususally does not react with chemicals. They are usually made of solid glass, about the thickness and slightly longer than a drinking straw, with rounded ends.

Multiple choice common laboratory equipments common laboratory apparatus and equipments laboratory equipments know about some common gases chemistry

What is the uses of cork in the laboratory?

  1. It is used as a plug so that the volatile substances do not go out of the container

  2. It also serve as a stopper

  3. Very helpful in fractional distillation

  4. both A and B
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Corks are useful for stopping of volatile substances to go out, stopper, helps in fractional distillations.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Crystallisation technique is better than simple evaporation technique as __________.

  1. some solids are evaporated with solvent

  2. some solids decompose or some may get charred on heating to dryness

  3. some impurities may remain dissolved in the solution even after filtration, which on evaporation contaminate the solid

  4. both (B) and (C)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Crystallisation technique for purification is better than evaporation because
1. The extent of purification in case of crystallisation technique is very high.
2. Does not require very high temperature conditions, there is no need to boil the solvent.
3. The technique does not require very high apparatus setup for performing the purification.
4. If the compound is soluble in one solvent & less soluble or insoluble in other solvents, crystallisation can be done by mixing of the two solvents only.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Identify the examples of separation of substances:

  1. separation of milk or curd to remove butter

  2. separation of stalks from grains

  3. separation of dirt particle from water

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All are the examples of separation of substances. 

Separation of milk and curd is done to obtain butter from it which is a useful component of milk.
Stalks are separated from grains to obtain pure grains.
Separation of dirt particles from water is done in order to pure water.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Mixtures on separation can give ____________.

  1. elements

  2. compounds

  3. both elements and compounds

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

Mixtures can be obtained by a combination of elements and compounds. Thus when they are separated, it can give both elements and compounds, depending upon the constituents of a mixture.
Example: Air is the mixture of various gases. It on separation gives oxygen, nitrogen, carbon dioxide, etc. 

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Column II gives method to separate phases mentioned in column I. Match them and select the correct answer from the codes given below.

Column I Column II
(a) Miscible liquids (p) Distillation
(b) Immiscible liquids (q) Crystallization
(c) Pure copper sulphate  from an impure sample (r) Sublimation
(d) Salt and ammonium chloride (s) Separating funnel

  1. (a) - (q), (b) - (s), (c) - (p), (d) - (r)

  2. (a) - (p), (b) - (s), (c) - (q), (d) - (r)

  3. (a) - (r), (b) - (s), (c) - (p), (d) - (q)

  4. (a) - (r), (b) - (s), (c) - (q), (d) - (p)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.
Salt and ammonium chloride can be separated using this.
Crystallization is also a chemical solid-liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs.
Pure copper sulphate from an impure sample.
Distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation. Distillation may result in essentially complete separation (nearly pure components), or it may be a partial separation that increases the concentration of selected components of the mixture.
A separating funnel is a glass funnel with a tap at the bottom. A separating funnel is a separation technique that is used for two liquids that do not dissolve in each other.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Choose the correct statement from the following.

  1. Liquor ammonia and soda water are examples of liquid-gas type mixtures.

  2. Mixture of coconut oil and water can be separated using separating funnel.

  3. A mixture of iodine and sulphur can be separated using magnetic separation.

  4. A mixture of sand and sawdust can be separated using solvent extraction.
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Liquor ammonia is a concentrated solution of ammonia in water due to which, it forms a liquid-gas mixture with soda water(carbon dioxide gas under pressure)


Since coconut oil and water have different densities, they can be separated from each other by using a separating funnel

Since none among iodine and sulphur have magnetic properties, they cannot be separated using magnetic separation

Both sand and sawdust are highly insoluble in all the solvents and they cannot be separated using solvent extraction method

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Mixture can be separated, and kind of separation method depends on kind of:

  1. mixure it is

  2. solution it is

  3. molecule it is

  4. compound it is
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In chemistry, a mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.

The individual substances in a mixture can be separated using different methods, depending on the type of mixture. These methods include filtration, evaporation, distillation and chromatography.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Two immiscible liquids can be separated by using: 

  1. evaporation disc

  2. separating funnel

  3. filter funnel

  4. can not be separated
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A separating funnel is specifically designed to separate two immiscible liquids based on their density differences. The denser liquid settles at the bottom and can be drained.