Tag: separation of substances

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Questions Related to separation of substances

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Column II gives method to separate phases mentioned in column I. Match them and select the correct answer from the codes given below.

Column I Column II
(a) Miscible liquids (p) Distillation
(b) Immiscible liquids (q) Crystallization
(c) Pure copper sulphate  from an impure sample (r) Sublimation
(d) Salt and ammonium chloride (s) Separating funnel

  1. (a) - (q), (b) - (s), (c) - (p), (d) - (r)

  2. (a) - (p), (b) - (s), (c) - (q), (d) - (r)

  3. (a) - (r), (b) - (s), (c) - (p), (d) - (q)

  4. (a) - (r), (b) - (s), (c) - (q), (d) - (p)
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.
Salt and ammonium chloride can be separated using this.
Crystallization is also a chemical solid-liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs.
Pure copper sulphate from an impure sample.
Distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation. Distillation may result in essentially complete separation (nearly pure components), or it may be a partial separation that increases the concentration of selected components of the mixture.
A separating funnel is a glass funnel with a tap at the bottom. A separating funnel is a separation technique that is used for two liquids that do not dissolve in each other.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

A gray solid when heated vaporised to form pure white crystals on the cooler parts of the test tube and heavily, black solid as the residue. It is likely that the original solid is :

  1. an element

  2. a metal

  3. a pure compound

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

Heating is a physical means to separate a mixture of two substances which are not chemically together as in a compound so they are separated by heating.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

A _____ is a mixture of two or more substances in a single phase.

  1. Element

  2. Compound

  3. Solution

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A solution is a mixture of two or more substances in a single phase. At least two substances must be mixed in order to have a solution. Since solutions are mixtures, their compositions may vary over a very wide range. The concentrations may be expressed using a variety of measures.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Which of the following statement is incorrect about mixtures?

  1. A mixture contains two or more substances

  2. Particles in mixtures are of more than one kind

  3. Compounds or elements in a mixture is mixed in any proportion by mass

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A mixture is a combination of two or more materials, compounds or elements where there is no chemical combination or reaction.

Here materials can be anything for example: compounds, elements etc.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Statement (1): Mixture is a chemical combination of two or more elements.
Statement (2): Properties of the constituents of a mixture remain same.

  1. Statement I is true and Statement II is false

  2. Both statement I and II are true and II is not a correct explanation of statement I

  3. Both statement I and II are false

  4. Statement I is false and Statement II is true

  5. Both statement I and II are true and II is a correct explanation of statement I
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The mixture is a combination of two or more elements in such a way that no chemical reaction occurs. So, a mixture is a physical combination of two or more elements.

Properties of the constituents of a mixture remain same. The mixture can be separated back into its original constituents.
So statement 1 is incorrect and statement 2 is correct.
So D) is the correct answer.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Choose the correct statement from the following.

  1. Liquor ammonia and soda water are examples of liquid-gas type mixtures.

  2. Mixture of coconut oil and water can be separated using separating funnel.

  3. A mixture of iodine and sulphur can be separated using magnetic separation.

  4. A mixture of sand and sawdust can be separated using solvent extraction.
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Liquor ammonia is a concentrated solution of ammonia in water due to which, it forms a liquid-gas mixture with soda water(carbon dioxide gas under pressure)


Since coconut oil and water have different densities, they can be separated from each other by using a separating funnel

Since none among iodine and sulphur have magnetic properties, they cannot be separated using magnetic separation

Both sand and sawdust are highly insoluble in all the solvents and they cannot be separated using solvent extraction method