Question

The electrochemical extraction of aluminum from bauxite ore involves

• A. the reaction of $Al _2 O _3$ with coke (C) at a temperature $>2500^{\circ} C$.
• B. the neutralization of aluminate solution by passing $CO _2$ gas to precipitate hydrated alumina $\left( Al _2 O _3 .3 H _2 O \right)$
• C. the dissolution of $Al _2 O _3$ in hot aqueous $NaOH$.
• D. the electrolysis of $Al _2 O _3$ mixed with $Na _3 AlF _6$ to give $Al$ and $CO _2$.

Answer 1

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

the neutralization of aluminate solution by passing $CO _2$ gas to precipitate hydrated alumina $\left( Al _2 O _3 .3 H _2 O \right)$

Answer 2

The neutralization of aluminate solution by passing $CO _2$ gas to precipitate hydrated alumina $\left( Al _2 O _3 .3 H _2 O \right)$
The dissolution of $Al _2 O _3$ in hot aqueous $NaOH$.
The electrolysis of $Al _2 O _3$ mixed with $Na _3 AlF _6$ to give $Al$ and $CO _2$.