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 determine which of the following oxides is not correctly matched with its nature (acidic, basic, neutral, or amphoteric), we need to analyze each oxide given in the question.

### Step-by-Step Solution:

1. **Identify the Oxides and Their Types**:
- The oxides given are P2O5, NO2, and Cl2O7. We need to classify each of these oxides.

2. **Classify P2O5**:
- P2O5 (Phosphorus pentoxide) is a non-metal oxide. It is known to be acidic because it can react with water to form phosphoric acid (H3PO4).
- **Classification**: Acidic

3. **Classify NO2**:
- NO2 (Nitrogen dioxide) is also a non-metal oxide. It can react with water to form nitric acid (HNO3), which indicates its acidic nature.
- **Classification**: Acidic

4. **Classify Cl2O7**:
- Cl2O7 (Dichlorine heptoxide) is another non-metal oxide. It reacts with water to form perchloric acid (HClO4), confirming its acidic character.
- **Classification**: Acidic

5. **Check for Other Oxides**:
- We also need to consider the nature of oxides like CO, BEO, CO2, ZnO, SnO, and Al2O3 as mentioned in the transcript.
- CO (Carbon monoxide) is a neutral oxide.
- BEO (Beryllium oxide) is also considered neutral.
- CO2 (Carbon dioxide) is acidic, which is correctly matched.
- ZnO (Zinc oxide) is amphoteric.
- SnO (Tin(II) oxide) is amphoteric.
- Al2O3 (Aluminum oxide) is amphoteric.

6. **Identify the Incorrect Match**:
- The transcript mentions that CO2 is acidic, which is correct. However, it states that CO and BEO are neutral, which is also correct. The only incorrect match mentioned is that CO2 is not acidic, which contradicts the classification.
- The only oxide that does not fit the classification correctly is CO2 being listed as neutral instead of acidic.

### Conclusion:
The oxide that is not correctly matched is **CO2**, as it is indeed an acidic oxide, not neutral.

### Final Answer:
**CO2 is not correctly matched as it is acidic, not neutral.**