Tag: separation methods

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Questions Related to separation methods

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

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

  1. Continuous extraction

  2. Distillation

  3. Chromatography

  4. Sublimation
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. decantation

  2. sublimation

  3. condensation

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

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

Choose the substance that shows sublimation:

  1. Naphthalene

  2. Toluene

  3. Kerosene

  4. Water
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Evaporation

  2. Filtration

  3. Centrifugation

  4. All of above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. sublimation, soluble

  2. sublimation, sublimes

  3. chromatography, soluble

  4. centrifugation, sublimes
Reveal answer Fill a bubble to check yourself
B Correct answer
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.