Question

Air is regarded as a mixture because ?

• A. Its pressure may vary.
• B. Its temperature may change
• C. Its volume change under different conditions
• D. Its composition may vary.

Answer 1

The correct option is D

Its composition may vary.

The explanation for the correct answer

option d) Its composition may vary.

• A mixture is a substance made up of two or more substances that are not chemically bonded e.g. Air
• Air is a mixture, but not a compound because air consists of different components such as oxygen, nitrogen, etc., and can be separated through the process of fractional distillation. Also, air shows all the properties of gases present in it.

The explanation for incorrect answers

A) Its pressure may vary-

• Different regions have different pressures, and pressure has no relation to the chemical constituents of the air.
• Hence, the given option is incorrect.

(B) Its temperature may change-

• A change in temperature does not change the composition of air.
• Hence, the temperature cannot define if the air is a mixture or not.

(C) Its volume change under different conditions-

• The volume of air may change in different conditions but it has no relation to the composition of air.

Hence, the air is regarded as a mixture because its composition may vary, option (D) is the correct answer.