Question

which of the following is not an example of a compound? hydrogen limestone water salt complete this quiz to finish the assignment for chemistry - p8 due on sep 19, 2025

Explanation:

A compound is a substance made up of two or more different chemical elements combined in a fixed ratio. Hydrogen is an element, not a compound. Limestone (calcium - carbonate), water (H₂O), and salt (sodium - chloride) are compounds.

Answer:

A. hydrogen