Tag: separation of substances

Questions Related to separation of substances

$3$ 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.

Example of liquid-liquid mixture is :

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

  1. oil in water

  2. muddy water

  3. smoke

  4. steel

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Correct Option: A

Which among the following statement(s) is/are true?

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

  1. Brass is an element

  2. Dry ice is a mixture

  3. Aerated drink, e.g., coca cola is a mixture

  4. Diesel is a mixture

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Correct Option: C,D
Explanation:

A ) Brass is an alloy made of copper and zinc.
B) Dry ice, sometimes referred to as "cardice" (chiefly British chemists), is the solid form of carbon dioxide, so it is a compound.
C) Aerated drink would be anything that would have fizz (gas) filled in it. For example, your pepsi, coke, thums up, mirinda etc.
D) Diesel is mixture of many hydrocarbons.
Options C & D are correct.

In a mixture, constituents exhibit:

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

  1. similar properties

  2. only those properties which are characteristic to the mixture.

  3. their own properties

  4. no properties

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Correct Option: C
Explanation:

Impure substances are commonly called mixtures. A mixture is a material containing two or more elements or compounds that are in close contact and are mixed in any proportion. The constituents of mixtures exhibit their individual properties. These constituents can be separated by physical means.

The alloy bronze contains Copper and Tin. This is a:

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

  1. homogeneous mixture

  2. heterogeneous mixture

  3. solid solution of two immiscible metals

  4. both A and B

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Correct Option: D
Explanation:

Generally, an alloy is a mixture of two or more elements, at least one of which is a metal, and which exhibits metallic bonding characteristics. It may be either homogeneous (eg a solid solution; i.e. single phase; e.g brass) or heterogeneous ( a mixture of metallic phases e. g. Steel— the iron/carbon system)