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Al2O3 can be converted to anhydrous AlCl3 by heating

1. Al2O3 with NaCl in solid state
2. a mixture of Al2O3 and carbon in dry Cl2 gas
3. Al2O3 with Cl2 gas
4. Al2O3 with HCl gas

Correct answer: a mixture of Al2O3 and carbon in dry Cl2 gas

Solution

Al2O3 reacts with carbon and dry Cl2 gas at high temperatures to form anhydrous AlCl3. The carbon acts as a reducing agent, facilitating the reaction.

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