Chemistry - Metallurgy Question with Solution | TestHub

(A) Correct: In the Bayer process, alumina is extracted from bauxite containing SiO₂, Al₂O₃, hydrated alumina AlOₙ(OH)₃₋₂ₙ and Fe₂O₃ using NaOH solution.

(B) Correct: In the Hall–Héroult process, Al³⁺ ions are reduced at the cathode from molten alumina dissolved in molten cryolite to give aluminum metal.

(C) Correct: In hydrometallurgical extraction of copper, leached Cu²⁺ ions can be reduced by H₂ to obtain copper.

(D) Correct: In the silica-lined converter, Cu₂S undergoes self-reduction with Cu₂O to produce copper during pyrometallurgy.

Answer: (A), (B), (C) and (D)