Question

10. Air is a

• A. pure substance.
• B. a heterogeneous mixture
• C. a homogeneous mixture.
• D. none of the above.

Answer 1

The correct option is C

a homogeneous mixture.

Explanation of correct option:

(C):

• Air is a homogeneous mixture.
• Homogeneous mixtures are those in which the components mixed are uniformly distributed throughout the mixture, they are uniform throughout.
• Air contains nitrogen, oxygen, argon, carbon dioxide, and many other gases.
• In the air, all gases would have a uniform composition.

Explanation of incorrect option:

(A) pure substance:

• A pure substance is made of a single substance only. It has nothing else mixed with it.
• Example: Iron, mercury, hydrogen, etc.

(B): a heterogeneous mixture

• Mixtures are said to be heterogeneous if they contain two or more unevenly mixed components.
• Example: Milk, soil, etc.

Conclusion: Hence, option (C) is correct.