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

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

  1. Evaporation

  2. Distillation

  3. Filteration

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

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

Iodine-salt mixture can be separated through:

  1. simple distillation

  2. simple filtration

  3. sublimation

  4. fractional distillation
Reveal answer Fill a bubble to check yourself
C Correct answer
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.
Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods

Examples of sublimate does not include:

  1. ammonium salts

  2. nitrates

  3. iodine

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

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

Sublimation is used to purify:

  1. plasma

  2. gases

  3. solids

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

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.

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

Process in which solid is directly converted to vapors state is called:

  1. sublimation

  2. filtration

  3. drying

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

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.

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

Sublimation can be used to separate a mixture of solids in which:

  1. one sublimes other does not

  2. both sublimes

  3. both does not sublime

  4. sublimation cannot be used for separation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sublimation can be used to separate a mixture of solids in which one sublimes other does not. Thus, ammonium chloride can be separated from sodium chloride by sublimation. Ammonium chloride sublimes whereas sodium chloride does not.

Multiple choice chemistry separation of matter sedimentation, decantation and filtration other methods of separation separation methods
The combustion of candles, containing paraffin wax, to carbon dioxide and water vapour is sublimation.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The term sublimation refers to a physical change of state and is not used to describe transformation of a solid to a gas in a chemical reaction. The combustion of candles, containing paraffin wax, to carbon dioxide and water vapor is not sublimation but a chemical reaction with oxygen.

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

On heating iodine and sand which will sublime?

  1. Sand

  2. Iodine

  3. Both a and b

  4. None of them
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iodine is a chemical element with atomic number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at a standard conditions that sublimes readily to form a violet gas.