Non-metals usally form acidic oxides.

Answer

**Step-by-Step Solution:**

1. **Understanding Non-Metals and Their Oxides:**
Non-metals are elements that typically do not conduct electricity well and are not malleable or ductile. Examples of non-metals include sulfur (S), nitrogen (N), and chlorine (Cl). When these non-metals react with oxygen, they form oxides.

2. **Identifying Non-Metal Oxides:**
Common non-metal oxides include:
- Sulfur dioxide (SO2)
- Nitrogen dioxide (NO2)
- Sulfur trioxide (SO3)
- Dichlorine monoxide (Cl2O)

3. **Reactions of Non-Metal Oxides with Water:**
When non-metal oxides dissolve in water, they react to form acids. For example:
- SO3 + H2O → H2SO4 (sulfuric acid)
- Cl2O + H2O → 2HOCl (hypochlorous acid)

4. **Conclusion on the Nature of Non-Metal Oxides:**
Since these reactions produce acids, we conclude that non-metal oxides are acidic in nature. Therefore, the statement "Non-metals usually form acidic oxides" is true.

5. **Comparison with Metal Oxides:**
In contrast, metal oxides generally form basic oxides when they react with water, which can produce bases. This highlights the difference in properties between metals and non-metals.

**Final Statement:**
The statement "Non-metals usually form acidic oxides" is true.

---