Which of the following is not correctly matched ?

Options

A. Acidic oxides `P_2O_5,NO_2,Cl_2O_7`
B. Basic oxides `Na_2O,CaO,MgO`
C. Neutral oxides `CO_2,CO,BeO`
D. Amphoteric oxides `ZnO,SnO,Al_2O_3`

Answer

To solve the question "Which of the following is not correctly matched?", we need to analyze the options provided for acidic oxides, basic oxides, and neutral oxides.

### Step-by-Step Solution:

1. **Identify Acidic Oxides:**
- Acidic oxides are typically oxides that react with water to form acids or with bases to form salts.
- Examples include:
- P2O5 (Phosphorus pentoxide)
- NO2 (Nitrogen dioxide)
- Cl2O7 (Dichlorine heptoxide)

**Conclusion:** The examples given for acidic oxides are correct.

2. **Identify Basic Oxides:**
- Basic oxides are oxides that react with acids to form salts and water.
- Examples include:
- Na2O (Sodium oxide)
- CaO (Calcium oxide)
- MgO (Magnesium oxide)

**Conclusion:** The examples given for basic oxides are also correct.

3. **Identify Neutral Oxides:**
- Neutral oxides are oxides that do not exhibit acidic or basic properties. They do not react with acids or bases.
- Examples often include:
- CO (Carbon monoxide)
- N2O (Nitrous oxide)
- H2O (Water)
- However, CO2 (Carbon dioxide) is an acidic oxide, not a neutral oxide, and BeO (Beryllium oxide) is amphoteric, meaning it can react with both acids and bases.

**Conclusion:** The examples given for neutral oxides are incorrect because CO2 is acidic and BeO is amphoteric.

4. **Final Decision:**
- Since option C incorrectly lists CO2 and BeO as neutral oxides, we conclude that this option is not correctly matched.

### Answer:
The option that is not correctly matched is **C** (Neutral Oxides: CO2, CO, BeO).

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