Determine the correct order of the steps to processing aluminum from bauxite. I. Al3+ ions undergo reduction, O2- ions undergo oxidation. II. Al3+ ions are attracted to the negative electrode on the bottom, O2- ions are attracted to the positive electrode on the top. III. Electric current is added IV. Oxygen and carbon from graphite form carbon dioxide, pure aluminum on the bottom is collected. V. Bauxite is added to molten cryolite in a tank with graphite electrodes. A. I, II, III, V, IV B. V, III, II, I, IV C. IV, V, III, I, II D. I, III, II, IV, V

Option B. V, III, II, I, IV

Explanation:

The steps involved in the processing of aluminum from bauxite include:

1. Bauxite is added to molten cryolite in a tank with graphite electrodes.

2. Electric current is added to maintain the process at about 1000°C. This makes the process more expensive to maintain.

3. Al3+ ions are attracted to the negative electrode and O2- ions are attracted to the positive electrode.

4. Al3+ ions undergo reduction, O2- ions undergo oxidation as shown below :

2Al3+ + 6e- —> 2Al (reduction)

O^2- —> O + 2e-

O + O —> O2 (oxidation)

5. Oxygen and carbon from graphite form carbon dioxide, pure aluminum on the bottom is collected at intervals.

Comparing this with the above question, the correct order is:

V, III, II, I, IV

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