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Among the following, basic oxide is: (1) SO3 (2) SiO2 (3) CaO (4) Al2O3

1. SO3
2. SiO2
3. CaO
4. Al2O3

Correct answer: CaO

Solution

Calcium oxide (CaO) is classified as a basic oxide because it reacts with acids to form salts and water, demonstrating its basic properties. In contrast, the other options either do not exhibit basic behavior or are classified as acidic or amphoteric.

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