Tag: classification of mixtures

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

A substance formed when two or more elements are mixed together without chemical reaction is known as:

  1. atom

  2. mixure

  3. molecule

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

In chemistry, a mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions
When a gas dissolves in liquid, there is decrease in volume thus:

  1. increase of pressure will favour the dissolution of gas in liquid

  2. increase of pressure will not favour the dissolution of gas in liquid

  3. increase of pressure has no affect on the dissolution of gas in liquid

  4. increase of temperature will favour the dissolution of gas in liquid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
When a gas dissolves in liquid, there is decrease in volume thus increase of pressure will favour the dissolution of gas in liquid. Initially total volume decreases, the pressure decreases. Now when pressure is increased, the system will shift in a direction that will decrease the pressure to nullify the effect of increase in pressure. This is through the dissolution of gas in liquid. This is similar to Le-chatellier's principle for chemical equilibrium.
Note:
Decrease of temperature will favour the dissolution of gas in liquid.
Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Two immiscible liquids can be separated by using: 

  1. evaporation disc

  2. separating funnel

  3. filter funnel

  4. can not be separated
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A separating funnel is specifically designed to separate two immiscible liquids based on their density differences. The denser liquid settles at the bottom and can be drained.

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

Substances are separated, because the :

  1. harmful substance can be removed

  2. non-useful substance can be removed

  3. useful substance, which we require separately

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

Separation of a mixture is done in order to :


(i) remove impurities or harmful substances.


(ii) to get pure substance.

(iii) to separate the components of the mixture and get the useful substance which is required, separately.


Hence the option D is correct.

Multiple choice chemistry composition of matter classification of mixtures mixtures: examples and properties types of solutions

Which pair of the following substances is said to be isomorphous?

  1. White vitriol and blue vitriol

  2. Epsom salt and Glauber salt

  3. Blue vitriol and Glauber salt

  4. White vitriol and epsom salt
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

White vitriol and blue vitriol are known as isomorphous because they have similar chemical formula and closely similar in shape.