When a metallic oxide is dissolved in water, then the solution formed has a high concentration of which ions

Options

A. `H^(+)`
B. `H_(3)O^(+)`
C. `OH^(-)`
D. `M^(+)`

Answer

To solve the question, "When a metallic oxide is dissolved in water, then the solution formed has a high concentration of which ions?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Nature of Metallic Oxides**:
- Metallic oxides are generally basic in nature. This means that when they dissolve in water, they will produce a basic solution.

**Hint**: Remember that metallic oxides are typically formed from metals and are known for their basic properties.

2. **Understand the Reaction with Water**:
- When a metallic oxide dissolves in water, it reacts to form a metal hydroxide. For example, sodium oxide (Na2O) reacts with water to form sodium hydroxide (NaOH).

**Hint**: Think about how oxides of metals interact with water to form hydroxides.

3. **Dissociation of Metal Hydroxide**:
- The metal hydroxide (like NaOH) dissociates in water to release hydroxide ions (OH⁻) and metal ions (e.g., Na⁺). This dissociation increases the concentration of hydroxide ions in the solution.

**Hint**: Consider what happens when a strong base dissolves in water—what ions are produced?

4. **Conclusion**:
- Since metallic oxides produce hydroxide ions when dissolved in water, the solution formed will have a high concentration of OH⁻ ions.

**Final Answer**: The solution formed has a high concentration of **OH⁻ ions**.

### Summary of the Steps:
- Metallic oxides are basic.
- They react with water to form metal hydroxides.
- Metal hydroxides dissociate to release OH⁻ ions.
- Therefore, the concentration of OH⁻ ions is high in the solution.