Oxide of metal cation which is not amphoteric ?

Options

A. `Al^(3+)`
B. `Cr^(3+)`
C. `Fe^(3+)`
D. `Zn^(2+)`

Answer

To solve the question "Oxide of metal cation which is not amphoteric," we will follow these steps:

### Step 1: Define Amphoteric Oxides
Amphoteric oxides are those oxides that can react with both acids and bases. This means they can act as either an acid or a base depending on the reaction conditions.

**Hint:** Remember that amphoteric oxides can neutralize both acids and bases.

### Step 2: Identify Common Metal Cations and Their Oxides
We need to consider the oxides of various metal cations. Some common examples include:
- Aluminum (Al³⁺) → Al₂O₃
- Chromium (Cr³⁺) → Cr₂O₃
- Iron (Fe³⁺) → Fe₂O₃
- Zinc (Zn²⁺) → ZnO

**Hint:** List the common metal cations and their corresponding oxides to analyze their properties.

### Step 3: Analyze the Oxides for Amphoteric Behavior
Now we will analyze the oxides listed:
- **Al₂O₃ (Aluminum oxide)**: Amphoteric
- **Cr₂O₃ (Chromium(III) oxide)**: Amphoteric
- **Fe₂O₃ (Iron(III) oxide)**: Basic (not amphoteric)
- **ZnO (Zinc oxide)**: Amphoteric

**Hint:** Check which oxides can react with both acids and bases to determine if they are amphoteric.

### Step 4: Identify the Non-Amphoteric Oxide
From the analysis, we find that Fe₂O₃ (Iron(III) oxide) is the only oxide among the ones considered that is not amphoteric; it behaves as a basic oxide.

**Hint:** Focus on the oxides that do not exhibit amphoteric behavior.

### Step 5: Conclusion
The oxide of the metal cation that is not amphoteric is Fe₂O₃, which corresponds to the cation Fe³⁺.

**Final Answer:** The oxide of metal cation which is not amphoteric is Fe₂O₃ (Iron(III) oxide).