Which of the following oxides will not give `OH^(-)` in aqueous solution ?

Options

A. `Fe_(2)O_(3)`
B. `MgO`
C. `Li_(2)O`
D. `K_(2)O`

Answer

To determine which of the following oxides will not give OH⁻ ions in aqueous solution, we need to analyze the nature of each oxide and its behavior when dissolved in water.

### Step-by-Step Solution:

1. **Identify the Oxides**: List the oxides provided in the question. For this example, let's assume the oxides are MgO, Li2O, K2O, and Fe2O3.

2. **Understand Basic Oxides**: Basic oxides are typically metal oxides that react with water to form hydroxides, which release OH⁻ ions. For example:
- MgO → Mg(OH)₂ (magnesium hydroxide)
- Li2O → 2LiOH (lithium hydroxide)
- K2O → 2KOH (potassium hydroxide)

3. **Analyze Each Oxide**:
- **MgO**: This oxide is basic and will dissolve in water to form magnesium hydroxide, releasing OH⁻ ions.
- **Li2O**: This oxide is also basic and will dissolve in water to form lithium hydroxide, releasing OH⁻ ions.
- **K2O**: This oxide is basic as well and will dissolve in water to form potassium hydroxide, releasing OH⁻ ions.
- **Fe2O3**: This oxide is amphoteric, meaning it can react with both acids and bases. However, it is insoluble in water and does not produce hydroxide ions when mixed with water.

4. **Conclusion**: Among the oxides listed, Fe2O3 does not give OH⁻ ions in aqueous solution because it does not dissolve in water to form a hydroxide.

### Final Answer:
The oxide that will not give OH⁻ in aqueous solution is **Fe2O3**.

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