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What explains the acidic nature of an aqueous solution of aluminum chloride?

1. Aluminum ions have a high charge-to-surface-area ratio.
2. The O–H bonds in [Al(H2O)6]3+ are less stable compared to the O–H bonds in pure water.
3. Aluminum chloride is a covalent compound, and its solution in water is acidic.
4. Chloride ions interact with water to produce hydrochloric acid.

Correct answer: The O–H bonds in [Al(H2O)6]3+ are less stable compared to the O–H bonds in pure water.

Solution

The O–H bonds in [Al(H2O)6]3+ are less stable compared to those in pure water, making the solution acidic due to the increased tendency of these bonds to break and release H+ ions.

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