Based on the chemical classification of matter, which of the following is NOT classified as a pure e — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

Diamond and Graphite are allotropes of carbon, consisting entirely of carbon atoms, and are thus pure elements. Tungsten is a metallic element. Silica ($SiO_2$) contains more than one kind of atom combined in a fixed ratio, making it a chemical compound, not an element.