Tag: other methods of separation

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

Name a technique used to separate : Iodine and alcohol

  1. filtration

  2. distillation

  3. evaporation

  4. sublimation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Iodine dissolved in alcohol is called tincture of iodine. Alcohol is a volatile liquid. So the mixture can be kept open or warmed in a water bath. Alcohol will evaporate leaving behind the iodine crystals.

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

Ammonium chloride is separated from a mixture of sodium chloride and ammonium chloride by the process of _____________.

  1. Crystallization

  2. Filtration

  3. Sublimation

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are way in separating mixtures of chloride salts such as that of sodium chloride and ammonium chloride. It can be done by crystallization, filtration, and sublimation. The easiest method among the three is separation by sublimation.  Ammonium chloride sublimes upon heating. Actually, the sublimation is a decomposition of ammonium chloride forming ammonia and hydrogen chloride. Sodium chloride, on the other hand, doesn't sublime and has a higher melting point than ammonium chloride. If we want to separate the mixture, we have to heat up to 330-350 degrees Celsius and collect the gas that will be produced. 

Hence, the correct option is D.

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

The process by which a mixture of sodium chloride and ammonium chloride can be separated, is called :

  1. sublimation

  2. chromatography

  3. evaporation

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

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.
To separate mixtures that contain a sublimate with volatile component from a non-sublimate impurity, the sublimation process is used. Ammonium chloride changes directly from solid to gaseous state on heating. The gaseous form of ammonium chloride can be cooled easily to get a pure solid.

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

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

  1. Filteration

  2. Sublimation

  3. Crystallisation

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

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

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

  1. Distillation

  2. Evaporation

  3. Filtration

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

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

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?

  1. Ammonium chloride

  2. Common salt (sodium chloride)

  3. A mixture of ammonium chloride and common salt

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

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

Mixture of sand and camphor is purified by:

  1. seperating funnel

  2. distillation

  3. cooling

  4. sublimation
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Camphor is seperated from NaCl by the method :

  1. Sublimation

  2. Distillation

  3. Sedimentation

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