Question

Air is a …….
A. Homogeneous mixture
B. Heterogeneous mixture
C. Compound
D. None of these

Answer 1

Hint: We know that our earth is covered with a blanket of gases around it which is known as atmosphere and the gases present in the atmosphere are known as air. Air is mainly composed of many types of gases like carbon dioxide, nitrogen, oxygen etc.

Complete answer:
Mixture refers with the term mixing of anything but in chemistry it has a definite meaning which can be described as when two or more substances mix with each other without participating in a chemical change then that resultant substance is known as the mixture. The main properties of the mixture are that the components of a mixture maintain their original properties, separations of the components is also easy to be done and proportion of the components is variable.
Mixture is of two types: Heterogeneous mixture and Homogeneous mixture. Where homogeneous mixtures are those who have the same properties and combinations throughout the mass whereas heterogeneous mixture possess different properties and compositions in various parts. Air is said to be the mixture of many gases. The composition of air is also not fixed and changes from place to place like in polluted areas the percentage of carbon dioxide is very large as compared to less polluted one. The main components of air are: Nitrogen, oxygen, carbon dioxide, argon and also some other gases. Therefore it is considered as a Homogeneous mixture.

Hence we can say that option A is the correct answer.

Note:
Heterogeneous mixture can be defined as the mixture in which components are completely mixed with each other and the particles of the mixture can be seen under the microscope and have non-uniform composition.