Tag: separation methods

Questions Related to separation methods

The ingredients from a mixture of iodine and sand can be separated by:

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

  1. Filteration

  2. Sublimation

  3. Crystallisation

  4. Precipitation

Show answer
Correct Option: B
Explanation:

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. when heated iodine turns directly to vapours leaving behind the sand particles

Which of the following process is used for preparation of common salt from sea water?

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

  1. Distillation

  2. Evaporation

  3. Filtration

  4. Sublimation

Show answer
Correct Option: B
Explanation:

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance.Sea water on evaporation leads to formation of salt when the liquid gets vaporized and the salt is left behind.

A mixture of sand and iodine can be separated by:

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

  1. distillation.

  2. fractionalization.

  3. sublimation.

  4. filtration.

Show answer
Correct Option: C
Explanation:

 Sand and iodine can be seperated by the process of sublimation. It is a process in which a solid converts directly into a gas without converting into a liquid.

When a mixture of common salt and ammonium chloride is heated, white fumes are liberated which change into a white deposit when cooked. What is this substance?

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

  1. Ammonium chloride

  2. Common salt (sodium chloride)

  3. A mixture of ammonium chloride and common salt

  4. Ammonium sulphate

Show answer
Correct Option: A
Explanation:

On heating the mixture of common salt and ammonium chloride in a china dish white fumes evolve and rise inside the funnel the china dish and cover it, to collect the fumes of the sublimating substance.

We collect fumes of ammonium chloride not of common salt because ammonium chloride is a sublimating substance and common salt is not a sublimating substance.

Mixture of sand and camphor is purified by:

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

  1. seperating funnel

  2. distillation

  3. cooling

  4. sublimation

Show answer
Correct Option: D
Explanation:

Sublimation is used for separating substances with on heating change directly into vapour. The vapour by cooling gives the pure substance in & solid form which is called sublimate. Here camphor wil sublime leaving behind the sand.

Which of the following when mixed with sand sublimes on heating?

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

  1. Benzoic Acid

  2. Sodium chloride

  3. Potassium chloride

  4. Phenol

Show answer
Correct Option: A
Explanation:

Sublimation method is used for separating substances which on heating change directly into vapour. Benzoic acid sublimes on heating.

Camphor is seperated from NaCl by the method :

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

  1. Sublimation

  2. Distillation

  3. Sedimentation

  4. Evaporation

Show answer
Correct Option: A
Explanation:

Camphor is separated from NaCl by Sublimation.
On heating, camphor is collected on the inner surface of the inverted funnel while NaCl left in the dish.
Note: Sublimation is the process of heating a solid to obtain vapours.
When a mixture of NaCl and camphor is heated, camphor sublimes and its vapours are obtained.
The vapours on cooling (when they come into contact with the inner surface of the inverted funnel ) condense into solid.

The process used for the seperation of those solids which sublime on heating from non volatile solids is :

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

  1. Evaporation

  2. Distillation

  3. Filteration

  4. Sublimation

Show answer
Correct Option: D
Explanation:

The process used for the separation of those solids which sublime on heating from non volatile solids is  sublimation.

Note:
Camphor is separated from NaCl by Sublimation.
 On heating, camphor is collected on the inner surface of the inverted funnel while NaCl left in the dish.
 Sublimation is the process of heating a solid to obtain vapours.
When a mixture of NaCl and camphor is heated, camphor sublimes and its vapours are obtained.
The vapours on cooling (when they come into contact with the inner surface of the inverted funnel ) condense into solid.

Iodine-salt mixture can be separated through:

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

  1. simple distillation

  2. simple filtration

  3. sublimation

  4. fractional distillation

Show answer
Correct Option: C
Explanation:
Iodine-salt mixture can be separated through sublimation. Iodine will sublime whereas salt will be left behind. Sublimation is a technique that helps chemists to purify. During sublimation, upon heating, a solid substance is converted to the gas phase without passing through the liquid phase.  A solid is heated under vacuum. The solid volatilizes and condenses as a purified compound on a cooled surface, a non-volatile residue of impurities is left behind.

Examples of sublimate does not include:

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

  1. ammonium salts

  2. nitrates

  3. iodine

  4. naphthalene

Show answer
Correct Option: B
Explanation:

Nitrates do not sublime whereas ammonium salts, iodine and naphthalene undergo sublimation.
Note:
Condensed solid produced during sublimation is sublimate.
Thus, sublimate is a solid deposit of a substance which has sublimed.