Study Notes
Oxides can be classified based on their reaction with acids and bases, and their metallic or non-metallic character.
- Acidic Oxide — Oxides of non-metals that react with water to form acids. Example: Carbon dioxide (CO₂) and sulfur dioxide (SO₂) are acidic oxides.
- Basic Oxide — Oxides of metals that react with acids to form salts and water. Example: Magnesium oxide (MgO) is a basic oxide.
- Amphoteric Oxide — Oxides that can react with both acids and bases to produce salt and water. Example: Aluminium oxide (Al₂O₃) and zinc oxide (ZnO) are amphoteric oxides.
- Neutral Oxide — Non-metal oxides that do not react with acids or bases. Example: Water (H₂O), carbon monoxide (CO), and nitric oxide (NO) are neutral oxides.
Exam Tips
Key Definitions to Remember
- Acidic Oxide: Non-metal oxides that form acids when dissolved in water.
- Basic Oxide: Metal oxides that react with acids to form salts and water.
- Amphoteric Oxide: Oxides that react with both acids and bases to form salt and water.
- Neutral Oxide: Non-metal oxides that do not react with acids or bases.
Common Confusions
- Confusing acidic oxides with basic oxides due to their reactions with water.
- Misidentifying amphoteric oxides as either purely acidic or basic.
Typical Exam Questions
- What is an example of an acidic oxide? Carbon dioxide (CO₂) is an example of an acidic oxide.
- How does an amphoteric oxide react with an acid? It reacts to form a salt and water.
- Name a neutral oxide. Water (H₂O) is a neutral oxide.
What Examiners Usually Test
- Ability to classify oxides as acidic, basic, amphoteric, or neutral.
- Understanding the reactions of amphoteric oxides with acids and bases.