Which of the following is not a homogeneous mixture?
Which of the following is not a homogeneous mixture?
The correct option is A Smoke
Explanation for the correct option:
(A) Smoke: Smoke is not a homogeneous mixture as smoke is a mixture of gases and Carbon particles distributed in between the gases in any proportion.
- Therefore, it does not have a uniform composition and properties throughout as there is a boundary of separation between particles of carbon and gases present in smoke leading to non-homogeneity.
- So, smoke is a heterogeneous mixture.
Mixture: When two or more substances (elements or compounds or an element and compound) are mixed in any proportion.
- Homogeneous mixture: A mixture that exhibits uniformity in its composition and properties throughout its mass is known as a homogeneous mixture.
- Examples: Salt solution, sugar solution etc.
Explanation for the incorrect options:
(B) Brass: Brass is a mixture of Copper and Zinc
- It is a homogeneous mixture in which two elements are combined together and the composition and properties are uniform throughout.
(C) Clean air: Clean air is a homogeneous mixture because:
- Clean air consists of only gaseous components like various gases namely Hydrogen , Nitrogen , Oxygen , water vapours etc.
- As a result all the gaseous phase constituents intermix with each other to create uniformity in the composition of air throughout.
- There is no clear boundary of separation in the the clean air.
(D) Solution of common salt in water: In this solution, common salt is dissolved in water so that the solution has a uniform composition of salt in water and uniform properties throughout the mixture and is homogeneous.
Hence, option (A) is correct.
Smoke
Explanation for the correct option:
(A) Smoke: Smoke is not a homogeneous mixture as smoke is a mixture of gases and Carbon particles distributed in between the gases in any proportion.
- Therefore, it does not have a uniform composition and properties throughout as there is a boundary of separation between particles of carbon and gases present in smoke leading to non-homogeneity.
- So, smoke is a heterogeneous mixture.
Mixture: When two or more substances (elements or compounds or an element and compound) are mixed in any proportion.
- Homogeneous mixture: A mixture that exhibits uniformity in its composition and properties throughout its mass is known as a homogeneous mixture.
- Examples: Salt solution, sugar solution etc.
Explanation for the incorrect options:
(B) Brass: Brass is a mixture of Copper and Zinc
- It is a homogeneous mixture in which two elements are combined together and the composition and properties are uniform throughout.
(C) Clean air: Clean air is a homogeneous mixture because:
- Clean air consists of only gaseous components like various gases namely Hydrogen , Nitrogen , Oxygen , water vapours etc.
- As a result all the gaseous phase constituents intermix with each other to create uniformity in the composition of air throughout.
- There is no clear boundary of separation in the the clean air.
(D) Solution of common salt in water: In this solution, common salt is dissolved in water so that the solution has a uniform composition of salt in water and uniform properties throughout the mixture and is homogeneous.
Hence, option (A) is correct.
