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 filtration and crystallisation other methods of separation separation techniques

A separating funnel is used to separate the components of a mixture of:

  1. iodine and sugar

  2. ethanol and water

  3. cooking oil and water

  4. ammonium chloride and iron filings
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A separating funnel is used to separate the components of a mixture of cooking oil and water. A separating funnel is used to separate the components of a mixture of two immiscible liquids. Cooking oil and water are two immiscible liquids.

Multiple choice chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

John tried to separate sugar from its solution using the evaporation method. However, he was unsuccessful. Which of the following is the likely reason?

  1. There was insufficient sugar in the solution

  2. He had forgotten to stir the solution during heating

  3. The sugar had decomposed

  4. The sugar had vaporised.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
John tried to separate sugar from its solution using the evaporation method. However, he was unsuccessful as the sugar had decomposed. When you sugar (sucrose) is heated, it undergoes dehydration. The crystalline structure breaks down. Molecules decompose into glucose and fructose and then lose water and polymerize to form caramel, which is a red-orange colored solid.
Multiple choice chemistry basic analytical techniques filtration and crystallisation other methods of separation separation techniques

Sand that is needed for a project has some common salt accidentally mixed with it. which of the following processes need to be used to separate sand and salt?
1. Filtration
2. Evaporation
3. Distillation
4. Crystallisation

  1. 1, 2

  2. 1,2 and 4

  3. 1, 2 and 3

  4. 1,2,3 and 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To separate the mixture of salt and sand;

first we will make the aqueous solution, salt gets dissolved in water and sand particle remain undissolved,
so, the misture can be separated by filtration and evaporation.

Multiple choice evs modern agriculture agricultural practices in india different types of farming and agriculture various agricultural practices

The process that is used to separate grain from stalks etc.is called as 

  1. Separation

  2. Threshing

  3. Hand picking

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

The process that is used to separate grain from stalks etc. is threshing. In this process, the stalks are beaten to free the grain seeds.

So, the correct answer is 'threshing'

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.