Tag: separation of matter

Questions Related to separation of matter

Which technique is used to separate sand from a mixture of sand and water?

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

  1. Decantation

  2. Evaporation

  3. Distillation

  4. Fractional distillation

Show answer
Correct Option: A
Explanation:

Sand settles at the bottom of water so the water can be poured into another container.Thus process is knwon as decantation.


Hence,option A is correct.

_____ is a method of separating suspended particles of a substance from liquid.

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

  1. Chromatography

  2. Centrifugation

  3. Distillation

  4. Magnetic separation

Show answer
Correct Option: B
Explanation:

Centrifugation is a method of separating suspended particles of a substance from liquid.

Centripetal force is applied with a centrifuge to sediment heterogeneous mixtures. It is used in industrial and laboratory settings. It is used in the separation of  two immiscible substances.

When an organic compound is present in an aqueous medium and is less soluble in any organic solvent then it is separated by?

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

  1. Continuous extraction

  2. Distillation

  3. Chromatography

  4. Sublimation

Show answer
Correct Option: A
Explanation:

When an organic compound is present in an aqueous medium and is less soluble in any organic solvent then it is seaparated by continuous extraction.

Hence, option A is correct.

Which of the substance is purified by sublimation?

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

  1. Naphthalene

  2. Benzoic acid

  3. Camphor

  4. All of these

Show answer
Correct Option: D
Explanation:

As all the above compound sublimes, so they are purified by the process of sublimation.


Hence, option D is correct.

Sublimation cannot be used for purification of:

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

  1. urea

  2. camphor

  3. benzoic acid

  4. napthalene

Show answer
Correct Option: A
Explanation:

As all others except urea are sublimes so they can be purified by sublimation. But, urea cannot be purified by sublimation.

Hence, option A is correct.

The process by which a solid changes directly into gas is called:

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

  1. decantation

  2. sublimation

  3. condensation

  4. sedimentation

Show answer
Correct Option: B
Explanation:

Sublimation

Sublimation is a specialized change of state when a solid substance skips the liquid phase and moves directly into the gas phase. This occurs because the substance absorbs energy so quickly from the surroundings that melting never occurs.

Examples of Sublimation:

1. "Dry ice" or solid carbon dioxide sublimes.

2. Snow and ice can sublime in the winter months without melting.

3. Moth balls sublime

4. Frozen foods will sublime and you will find ice crystals inside of the box or bag.

Choose the substance that shows sublimation:

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

  1. Naphthalene

  2. Toluene

  3. Kerosene

  4. Water

Show answer
Correct Option: A
Explanation:

Sublimation is a specialized change of state when a solid substance skips the liquid phase and moves directly into the gas phase. This occurs because the substance absorbs energy so quickly from the surroundings that melting never occurs.

Naphthalene shows the sublimation.

How will you obtain common salt from sea water?

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

  1. Filtration

  2. Evaporation

  3. Sedimentation

  4. Handpicking

Show answer
Correct Option: B
Explanation:

Evaporation is the method to separated dissolved solid impurites in the liquid so if we evaporate sea water evaparates and common salt is left behind.

To separate ammonium chloride from common salt, we use:

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

  1. filtration

  2. sedimentation

  3. sieving

  4. sublimation

Show answer
Correct Option: D
Explanation:

Here ammonium chloride is sublimable so to separate it from common salt we have to do sublimation.


Evaporation is used to seperate:

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

  1. salt from water

  2. pepper and sand

  3. sand and water

  4. camphor and $NaCl$

Show answer
Correct Option: A
Explanation:

The answer is salt from water.
Evaporation is used to separate a non-volatile soluble salt from a liquid. On heating, the liquid evaporates and soluble salt remains behind.