Tag: sedimentation, decantation and filtration

Questions Related to sedimentation, decantation and filtration

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

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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

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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.

Copper sulphate dissolved in water can be recovered as solid by:

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

  1. Evaporation

  2. Filtration

  3. Centrifugation

  4. All of above

Show answer
Correct Option: A
Explanation:

Evaporation is used to separate a soluble solid from a liquid. For example, copper sulfate is soluble in water its crystals dissolve in water to form copper sulfate solution. During evaporation, the water evaporates away leaving solid copper sulfate crystals behind.

The process of _________ is used to separate the component from a solid-solid mixture which _________ on heating and the other component being non-volatile.

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

  1. sublimation, soluble

  2. sublimation, sublimes

  3. chromatography, soluble

  4. centrifugation, sublimes

Show answer
Correct Option: B
Explanation:

The process of sublimation is used to separate the component from solid-solid mixture which sublimes on heating and the other component being non-volatile.

Camphor can be separated using :

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

  1. distillation

  2. sublimation

  3. fractional distillation

  4. centrifugation

Show answer
Correct Option: B
Explanation:

Camphor is a solid that gets converted to gas without changing to liquid. Hence, it can be separated by sublimation provided the other substance in non-volatile. It is highly volatile.