CuFeS2 is concentrated by froth floatation method. — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: The Goldschmidt alumino-thermite process is used to reduce metal oxides (especially iron oxide or chromium oxide) to molten metals using aluminium powder. Step 2: The reaction is highly exothermic and can be represented as: 2Al + Fe2O3 -> Al2O3 + 2Fe. Step 3: This reaction forms the basis of the thermite process used for welding railway tracks and reducing refractory metal oxides. Thus, the correct option is (d).