Name two metal oxides which are soluble in water.

Explanation

**Step-by-Step Solution:**

1. **Understanding Metal Oxides**: Metal oxides are compounds formed when metals react with oxygen. They typically have the general formula of \( \text{M}_x\text{O}_y \), where M represents the metal.

2. **Identifying Soluble Metal Oxides**: Not all metal oxides are soluble in water. However, some alkali metal oxides are known to be soluble.

3. **Examples of Soluble Metal Oxides**:
- **Potassium Oxide (K2O)**: When potassium oxide is added to water, it reacts to form potassium hydroxide, which is soluble in water.
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