Tag: process of separating components of a mixture

Questions Related to process of separating components of a mixture

Which of the following represents correct statement(s)?

chemistry changes around us crystallisation process of separating components of a mixture physical changes

  1. Salt can be obtained by the evaporation of sea water.

  2. The salt obtained during crystallisation is pure and its crystals are large.

  3. After crystallisation, the shape of the crystals can be seen clearly.

  4. Large crystals of pure substances cannot be formed from their solutions.

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Correct Option: A
Explanation:

The option (A) represents correct statements.
Salt can be obtained by the evaporation of sea water.
The salt obtained during crystallisation is not pure and its crystals are small.
After crystallisation, the shape of the crystals cannot be seen clearly.
Large crystals of pure substances can be formed from their solutions.

Salt can be obtained by ___________ of sea water.

chemistry changes around us crystallisation process of separating components of a mixture physical changes

  1. sublimation

  2. cooling

  3. evaporation

  4. heating

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Correct Option: C
Explanation:

On evaporation of seawater in shallow pools, salt along with impurities remain behind. Impured salt is taken in a tank and its saturated solution is prepared. In a saturated solution of salt, HCl vapours are passed. Chloride ions being common to both, it's concentration increases, and NaCl gets precipitated which is free from impurities.

The process of forming large crystals of pure substances from their solutions is known as __________.

chemistry changes around us crystallisation process of separating components of a mixture physical changes

  1. evaporation

  2. purification

  3. condensation

  4. crystallisation

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Correct Option: D
Explanation:

The process of forming large crystals of pure substances from their solutions is known as Crystallization. The principle of crystallization is concerned with the thermodynamic conditions of crystallization and the kinetics of crystal nucleation and growth.
Crystallization is the physical transformation of a liquid solution or gas to a crystal which is a solid with an ordered internal arrangement of molecules, ions or atoms.

Crystallisation is an example of ____________.

chemistry changes around us crystallisation process of separating components of a mixture physical changes

  1. physical change

  2. biological change

  3. chemical change

  4. fundamental change

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Correct Option: A
Explanation:

The process of formation of solid crystals from a homogeneous solution is called crystallization. It is a physical change. Crystallization is the solidification of atoms or molecules into a highly structured form called a crystal. It can also refer to the solid-liquid separation and purification technique in which mass transfer occurs from a liquid solution to a pure solid crystalline phase.

For example Salt we get from seawater can have many impurities in it. To remove these impurities, the process of crystallization is used.

Hence, the correct option is $A$

A synthetic indicator phenolphthalein gives _____ colour in acidic solution.

chemistry changes around us crystallisation process of separating components of a mixture physical changes

  1. red

  2. blue

  3. pink

  4. colourless

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Correct Option: D
Explanation:

Phenolphthalein [3,3-Bis (4- hydroxyphenyl)- 2 benzofuran- 1-one] is often used as an indicator in acid-base titrations. It turns colourless in acidic solutions and pink in basic solutions. Phenolphthalein is slightly soluble in water and usually dissolved in alcohols for use in experiments. It is a weak acid which can loose $H^{+}$ ions in solution.

A mixture of powdered salt and sugar can be separated by the process of winnowing.

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. True

  2. False

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Correct Option: B
Explanation:

No, we cannot separate powdered salt and sugar by winnowing beacuse they are forming homogeneous solution.


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

  1. Iron, salt, water.

  2. Sulphur, carbon disulphide, water.

  3. Gun powder, common salt, water.

  4. Iodine, sand, alcohol.

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Correct Option: A

Which technique can be used to separate iron from mixture of iron and copper?

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. Sublimation

  2. Magnetic separation

  3. Solvent extraction

  4. Sedimentation

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Correct Option: B
Explanation:

As iron can be attracted by magnets, so magnetic separation method method can be used to separate iron from the mixture.

State a method to separate ammonium chloride from a mixture of ammonium chloride and potassium chloride.

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. Sedimentation

  2. Sublimation

  3. Magnetic separation

  4. Solvent extraction

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Correct Option: B
Explanation:

Ammonium chloride sublimes on heating therefore it is easy to remove it by sublimation from a mixture of ammonium chloride and potassium chloride.

Which method can be used to separate two solid mixtures one of which dissolves in a particular solvent and other does not?

chemistry mix and separate dry methods of separation process of separating components of a mixture method of separation

  1. Separating funnel

  2. Sublimation

  3. Magnetic separation

  4. Solvent extraction

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Correct Option: D
Explanation:

The two solid mixtures, one of which dissolves in a particular solvent and other does not, can be separated by solvent extraction method.