Roasting of copper pyrites is done : — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: Recall that an Ellingham diagram is a graphical representation of the thermodynamic feasibility of metallurgical reactions. Step 2: It plots the standard Gibbs free energy of formation (ΔG°) of oxides (or sulfides/halides) per mole of O2 consumed as a function of absolute temperature (T). Step 3: Thus, it represents the change of ΔG with temperature, which corresponds to option (a).