Tag: mixtures: examples and properties

Questions Related to mixtures: examples and properties

Identify the examples of separation of substances:

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

  1. separation of milk or curd to remove butter

  2. separation of stalks from grains

  3. separation of dirt particle from water

  4. all of these

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Correct Option: D
Explanation:

All are the examples of separation of substances. 

Separation of milk and curd is done to obtain butter from it which is a useful component of milk.
Stalks are separated from grains to obtain pure grains.
Separation of dirt particles from water is done in order to pure water.

Which one of the following is not a mixture?

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

  1. Distilled water

  2. Sugar dissolved in water

  3. Liquefied Petroleum Gas (LPG)

  4. Gasoline

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Correct Option: A
Explanation:

Distilled water is the pure form of water with no impurities present in it;

others are the misture of two or more components.

Mixtures on separation can give ____________.

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

  1. elements

  2. compounds

  3. both elements and compounds

  4. impure substances

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Correct Option: C
Explanation:

Mixtures can be obtained by a combination of elements and compounds. Thus when they are separated, it can give both elements and compounds, depending upon the constituents of a mixture.
Example: Air is the mixture of various gases. It on separation gives oxygen, nitrogen, carbon dioxide, etc. 

The amountof $H _2S$ required to precipitate $1.69$g $BaS$ from $BaCl _2$ solution is : 

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

  1. $3.4g$

  2. $0.24g$

  3. $0.34g$

  4. $0.17g$

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Correct Option: C
Explanation:

$BaCl _2+H _2S\longrightarrow BaS+2HCl$
                                  $1.69$ $g$
For $1$ $mole$ of $H _2S$ produce $1$ $mole$ of $BaS$
So, $1$ $mole$ $H _2S\longrightarrow 1$ $mole$ $BaS$
            $34$ $g$                      $169$ $g$
                      $(x)\longleftarrow 1.69$ $g$
$\implies x=\cfrac {1.69\times 34}{169}=0.34$ $g$
Amount of $H _2S$ needed $=0.34$ $g$

$3$ litre of mixture of propane $(C {3}H _{8})$ $ butane $(C{4}H_{10})$ on complete combustion gives $10$ litre $CO_{2}$. Find the composition of mixture.

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

  1. $C _{3}H _{8}2L$ and $C _{4}H _{10}\ 1L$

  2. $C _{3}H _{8}3L$ and $C _{4}H _{10}\ 0L$

  3. $C _{3}H _{8}\ 1.5L$ and $C _{4}H _{10}\ 1.5L$

  4. $C _{3}H _{8}\ 0L$ and $C _{4}H _{10}\ 3L$

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Correct Option: A

An aqueous solution containing $1g$ of urea boils at $100.25^ {o}C$. The aqueous solution containing $3g$ of glucose in the same volume will boil at-

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

  1. $100.75^ {o}C$

  2. $100.5^ {o}C$

  3. $100^ {o}C$

  4. $100.25^ {o}C$

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Correct Option: D

Mixture is a physical combination of two or more pure substances.

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

  1. True

  2. False

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Correct Option: A
Explanation:

Mixture, a physical combination of two or more pure substances. A mixture is distinguished from a compound, which is formed by the chemical combination of two or more pure substances in a fixed, definite proportion. 

It should be noted that the components of a mixture retain their own chemical properties and may be present in any proportion.

Gunpowder is an example of a__________.

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

  1. compound

  2. mixture

  3. element

  4. none of these

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Correct Option: B
Explanation:
Gunpowder is an explosive mixture of potassium nitrate, charcoal, and sulphur in ratio 75 : 15: 10 used in time fuses, blasting and fireworks. 
It is obtained by mixing compounds so it is not a compound or an element.

Example of liquid-gas mixture is :

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

  1. fog

  2. smoke

  3. muddy water

  4. milk

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Correct Option: A

A true solution (or simply a solution) is a homogeneous mixture, in which the solute and solvent molecules cannot be distinguished even under a microscope.

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

  1. True

  2. False

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Correct Option: A
Explanation:

A true solution (or simply a solution) is a homogeneous mixture, i.e., in a true solution, the solute and solvent molecules cannot be distinguished even under a microscope because the size of the particle is very small.