Tag: pure substance and mixtures

Questions Related to pure substance and mixtures

Which of the following is not an example of compound?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. Brass

  2. Air

  3. Bitumen

  4. All of the above

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Correct Option: D
Explanation:

Brass, Air and Bitumen are all mixtures. None of them are compounds.

Mixture is different from a compound. True or false?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. True

  2. False

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Correct Option: A
Explanation:

A mixture consists of two or more substances which may be elements, compounds or both mixed together physically in any proportion, but not chemically combined. However, a compound consists of two or more elements that are chemically combined in a fixed proportion. Hence, a compound is different from a mixture.

The components present in mixtures are in :

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. fixed proportion

  2. variable proportion

  3. Both A and B

  4. None of the above

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Correct Option: B
Explanation:

The components present in the mixture are in variable proportions.

Which of the following is not a property of mixture?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. Does not have a sharp melting or boiling point

  2. Heat is taken in or given out in the preparation

  3. Can be separated by physical means

  4. May be homogeneous or heterogeneous

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Correct Option: B
Explanation:

The parts of a mixture can be separated by physical means. A mixture does not have a sharp melting or boiling point. It may be homogeneous or heterogeneous. Energy is neither given out nor absorbed in the preparation of a mixture. However, heat is taken in or given out in the preparation of a compound.

Which of the following statement is incorrect?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. In compounds components are present in definite proportion whereas in mixtures components are present in varying proportion

  2. Compounds are homogenous whereas mixtures are mostly heterogeneous

  3. Particles in a compound are generally of same kind whereas in mixtures they are of different kind

  4. None of the above

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Correct Option: D
Explanation:

All the compounds are made up of different elements and have properties different from their constituent element.

Mixture composed of variant proportion of components.
Hence, all statements are correct.

Which of the following is a characteristic property of both mixtures and compounds?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. Their properties are same as those of their components

  2. Energy is released when they are formed

  3. Their masses are equal to the sum of the masses of their components

  4. They contain the components in fixed proportions

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Correct Option: C
Explanation:

Mixture and a compound both follow the law of conservation of mass so their weight equals to the sum of mass of their components.

Ionic compounds have ____ melting and boiling points whereas covalent compounds have _____ melting and boiling point.

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. low, high

  2. moderate, low

  3. high, low

  4. moderate, high

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Correct Option: C

Which of the following can give further simplification using ordinary means?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. An element or a mixture

  2. A mixture or a compound

  3. A mixture or an atom

  4. An element or a compound

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Correct Option: B
Explanation:

A mixture or a compound can give further simplification using ordinary means.


A mixture can be broken into individual components.

A compound can be broken into individual elements.

A substance composed of two or more compounds, each of which retains its own properties is called a mixture.

Hence option B is correct.

A commercial cake is :

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. a molecule

  2. a mixture of compounds

  3. an isotope

  4. an isomer

  5. an acid salt

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Correct Option: B
Explanation:

A commercial cake is a mixture of compounds. 


Cake contains various compounds such as coco, butter, milk, cream etc.

Hence the correct option is B.

In which row are the substances correctly classified?

chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

  1. element - brass; compound - sulfur; mixture - water

  2. element - sulfur; compound - brass; mixture - water

  3. element - sulfur; compound - water; mixture - brass

  4. element - water; compound - sulfur; mixture - brass

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Correct Option: C
Explanation:
$\text{1.water is a compound made by combination of hydrogen and oxygen.}$
$\text{2.sulfur is an element.}$
$\text{3.Brass is mixture of elements sulphur and zinc.}$