The correct option is Basic.
Explanation
Oxides are chemical compounds containing at least one oxygen atom and one other element. The chemical nature of an oxide-whether it is acidic, basic, neutral, or amphoteric-is primarily determined by the metallic or non-metallic character of the element bonded with oxygen.
Detailed Analysis
- Basic Nature of Metallic Oxides: Metals generally have a tendency to donate electrons. When they react with oxygen, they form ionic oxides. These metallic oxides are basic in nature.
- Reaction with Water: Many metallic oxides react with water to form metal hydroxides, which are bases. For example:
Na2O (Sodium Oxide) + H2O → 2NaOH (Sodium Hydroxide) - Reaction with Acids: Metallic oxides react with acids to produce salt and water. This neutralization reaction confirms their basic character. For example:
CuO (Copper Oxide) + 2HCl → CuCl2 (Copper Chloride) + H2O - Exceptions (Amphoteric Oxides): While the general rule is that metallic oxides are basic, certain metal oxides like Aluminum oxide (Al2O3) and Zinc oxide (ZnO) are amphoteric, meaning they show both acidic and basic properties. However, the question asks for the general nature, which is basic.
- Comparison with Non-metals: In contrast, non-metallic oxides (e.g., SO2, CO2) are generally acidic in nature.
Key Takeaway: Generally, metallic oxides are basic and turn red litmus blue, whereas non-metallic oxides are acidic and turn blue litmus red.