Q. The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is : (Atomic mass Al = 27)
A) 180 kg
B) 120 kg
C) 360 kg
D) 90 kg
Explanation
[Solution from source] 2Al₂O₃ + 3C → 4Al + 3CO₂. 270 kg Al = 10 kmol, needing (3/4) × 10 = 7.5 kmol C = 90 kg. 180 kg assumes CO is formed (1 C per O) instead of CO₂. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.