Serpeck’s process is utilized for the purification of white bauxite. Which of the following sequence — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Serpeck's process is used for white bauxite (high silica impurity). The ore is heated with coke and nitrogen at $1800^\circ C$ to form solid Aluminium Nitride ($AlN$), while silica is reduced to volatile Si. The $AlN$ is then hydrolyzed to form $Al(OH)_3$ and $NH_3$ gas.