MgO is used as a refractory material because : — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: Refractory materials are classified into acidic, basic, and neutral based on their chemical behavior at high temperatures. Step 2: CaO and MgO are basic refractories; SiO2 is an acidic refractory. Graphite (carbon) is chemically inert to both acids and bases at high temperatures. Step 3: Thus, Graphite acts as a classic neutral refractory material, corresponding to option (a).