First slide

General methods of extraction of elements from the earth crust

Question

In the extraction of aluminium metal, one of the process is summarised as follows:
Which of the following entries incorrectly summarises reagents, electrodes & products of the process?
A B C D E
1. NaOH Al³⁺ HF Na₃AlF₆ Cathode
2. NaOH NaAlO₂ CO₂ NaF Anode
3. H₂SO₄ Al₂(SO₄)₃ NH3 Na₃AlF₆ Cathode
4. NaOH NaAlO₂ CO₂ Na₃AlF₆ Cathode

Moderate

A

1
B

2
C

3
D

4

Solution

bauxite with NaOH shows bayers process and separate from impurity and forms sodium metaaluminate.

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