Question

14 which of the following is an example of a homogeneous mixture?
pure air
pure water
carbon dioxide - gas (co₂)
a bar of gold

Explanation:

A homogeneous mixture has a uniform composition throughout. Pure water is a compound and not a mixture. Carbon - dioxide gas is a compound. A bar of gold is a pure substance. Pure air is a homogeneous mixture as it is a uniform combination of different gases like nitrogen, oxygen etc.

Answer:

Pure air