Tag: separation of matter

Questions Related to separation of matter

Pure solid can be obtained from its impure sample by :

chemistry separation of matter filtration and crystallisation other methods of separation separation techniques

  1. sedimentation

  2. crystallisation

  3. distillation

  4. decantation

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Correct Option: B
Explanation:

Pure solids can be obtained from its impure sample by crystallisation.
Crystallisation is used to purify solids.

Crystallisation is better than simple evaporation because :

chemistry separation of matter filtration and crystallisation other methods of separation separation techniques

  1. some impurities may remain in the solution after filtration

  2. some solids decompose or heating

  3. both A and B

  4. none of the above

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Correct Option: C
Explanation:

Some solids decompose or some, like sugar, may get charred on heating to dryness. Some impurities may remain dissolved in the solution even after filtration. On evaporation these contaminate the solid. So, crystallisation is better than evaporation.

In the process of crystallisation, crystals formed by different substances :

chemistry separation of matter filtration and crystallisation other methods of separation separation techniques

  1. are of same shapes and colours

  2. are of different shapes and colours

  3. shape and colour depends upon the amount of solute present

  4. can't be predicted

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Correct Option: B
Explanation:

Different substances form crystals of different shapes and colours.

If the constituents of a solid-liquid mixture have different masses, then we can separate them using:

chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

  1. sublimation

  2. centrifugation

  3. winnowing

  4. evaporation

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Correct Option: B
Explanation:

Centrifugation is a technique which involves the application of centrifugal force to separate particles from a solution. The larger the size and the larger the density of the particles, the faster they separate from the mixture. Example- washing machine works on the principle of centrifugation.

State a method to separate a solid-liquid mixture containing a soluble solid in the liquid components.

chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

  1. Fraction distillation

  2. Filtration

  3. Sedimentation

  4. Distillation

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Correct Option: D
Explanation:

A solid-liquid mixture containing a soluble solid in the liquid components can be separated by distillation.

Which method is used to separate salt from the salt water?

chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

  1. Filtration

  2. Distillation

  3. Evaporation

  4. Sedimentation

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Correct Option: C

Select the methods to separate a solid-liquid mixture containing an insoluble solid in the liquid components. 

chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

  1. Sedimentation

  2. Filtration

  3. Distillation

  4. Fractional distillation

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Correct Option: A,B

Which of the following can be used for Solid-Solid mixture separation?

chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

  1. Mechanical separation

  2. Magnetic separation

  3. Gravity separation

  4. All of above

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Correct Option: D

Water is said to be permanently hard when it contains:

chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

  1. chloride and sulphates of Mg and Ca

  2. bicarbonate of Na and K

  3. carbonate of Na and K

  4. none of these

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Correct Option: A

Which of the following country leads the world in silk production?

chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

  1. India

  2. Sri lanka

  3. Nepal

  4. China

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Correct Option: D
Explanation:

China leads the world in silk production followed by India.