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In determining the most acidic oxide among the options provided (Al2O3, CaO, Na2O, and SO2), we can consider the acidic nature of oxides based on their ability to react with water to form acids.
1. Aluminum oxide (Al2O3) is amphoteric, meaning it can exhibit both acidic and basic properties depending on the environment. It can react with both acids and bases.
2. Calcium oxide (CaO) is a basic oxide, not acidic. When CaO reacts with water, it forms a base (calcium hydroxide).
3. Sodium oxide (Na2O) is a basic oxide as well. It reacts with water to form a strong base (sodium hydroxide).
4. Sulfur dioxide (SO2) is the most acidic oxide among the options provided. When SO2 dissolves in water, it forms sulfurous acid (H2SO3), which is a weak acid.
Therefore, in this case, SO2 is the most acidic oxide among the options listed due to its ability to form an acid when reacting with water.
