Question

Which of the following is/are NOT 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 $C{O}_2$, so, it is a compound. A compound is made up of only one kind of particles. For example, water is a compound as it comprises only $H_{2}O$ particles.

Brass, an alloy, is a solid solution of copper and zinc. Air is a gaseous homogeneous mixture containing a lot of gases. Whereas the ocean water is a liquid solution that contains lots of salts.