Tag: other methods of separation

Questions Related to other methods of separation

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

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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

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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.

Sublimation is used to purify:

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

  1. plasma

  2. gases

  3. solids

  4. liquids

Show answer
Correct Option: C
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.

Which one of the following substances is a mixture?

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

  1. Water

  2. Copper

  3. Seawater

  4. Salt

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Correct Option: C
Explanation:

Sea water is a mixture. It contains water and dissolved minerals. Water and salt are compounds. Copper is element.

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

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

  1. sublimation

  2. filtration

  3. drying

  4. cooling

Show answer
Correct Option: A
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.

Condensed solid produced during sublimation is:

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

  1. crystals

  2. sublimate

  3. residue

  4. insoluble

Show answer
Correct Option: B
Explanation:

Condensed solid produced during sublimation is sublimate. Thus, sublimate is a solid deposit of a substance which has sublimed.

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

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

  1. one sublimes other does not

  2. both sublimes

  3. both does not sublime

  4. sublimation cannot be used for separation

Show answer
Correct Option: A
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.

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

  1. True

  2. False

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Correct Option: B
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.

On heating iodine and sand which will sublime?

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

  1. Sand

  2. Iodine

  3. Both a and b

  4. None of them

Show answer
Correct Option: B
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.