4648Chemical EngineeringMedium
Identify the correct statement with reference to the extractive metallurgy of aluminium?
AAnode effect sets in when the cryolite concentration goes below 40%.
BSodium is deposited along with aluminium, but is immediately vaporised
CApproximately 80% of the aluminium deposited on the cathode comes from cryolite
DThe electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3
Correct answer
D. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3
Explanation
The correct answer is The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3.