Which of the following is a mixture?*1 pointA) Pure waterB) AirC) Sodium chloride (table salt)D) Hydrochloric acid (HCl)

The answer is B) Air.

Here's why:

A) Pure water is not a mixture because it contains only one type of molecule - H2O.

B) Air is a mixture because it contains various types of molecules such as nitrogen, oxygen, carbon dioxide, and others.

C) Sodium chloride (table salt) is not a mixture because it is a compound, which means it is made up of two or more elements that are chemically combined.

D) Hydrochloric acid (HCl) is not a mixture because it is a compound, which means it is made up of hydrogen and chlorine that are chemically combined.