Question

Which of the following is/are not a solution(s)?

• A. Brass
• B. Ocean water
• C. Air
• D. Carbon dioxide

Answer 1

The correct option is D Carbon dioxide

Carbon dioxide is not a solution because it is not a mixture. It has only particles of $C{O}_2$. Hence, it is a compound. A compound is made up of only one kind of particles.

Brass, an alloy, is a solid solution of copper and zinc.

Air is a gaseous homogeneous mixture containing various gases.

Also, the ocean water is a liquid solution that contains various types of salts.