Question

CO2. NaCl. HCl. These may all be classified as____. A) elements and compounds B) elements and molecules C) elements and pure substances D) compounds and pure substances

Answer 1

I believe the correct answer is D. Compounds and pure substances.

Answer 2

First, the substances being mentioned in the given are all compounds. They are combinations of the atoms of different elements in a proper proportion. Furthermore, they are also pure substances as they do not exists as mixtures of two or more compounds. Thus, the answer is letter D.