How many molecules are acidic oxides among the following :
`CO, NO_(2), SO_(2), SO_(3), NO, N_(2)O, SiO_(2), Cl_(2)O_(7)`

Options

A. 4
B. 5
C. 6
D. 7

Answer

To determine how many molecules among the given options are acidic oxides, we will analyze each oxide based on its properties.

### Step-by-Step Solution:

1. **List the Given Oxides**:
The oxides provided are:
- CO
- NO₂
- SO₂
- SO₃
- NO
- N₂O
- SiO₂
- Cl₂O₇

2. **Identify Metallic and Non-Metallic Oxides**:
- Metallic oxides are typically basic, while non-metallic oxides can be acidic.
- In this case, all the given oxides are non-metallic, so we will consider all of them for acidity.

3. **Classify Neutral Oxides**:
- Neutral oxides do not exhibit acidic or basic properties. The neutral oxides among the given options are:
- CO (Carbon monoxide)
- NO (Nitric oxide)
- N₂O (Dinitrogen oxide)
- Therefore, we can eliminate these three from consideration as acidic oxides.

4. **List Remaining Oxides**:
After removing the neutral oxides, we are left with:
- NO₂
- SO₂
- SO₃
- SiO₂
- Cl₂O₇

5. **Determine Acidic Character**:
- Acidic oxides typically have a higher oxidation state of the central atom:
- NO₂: Nitrogen has an oxidation state of +4.
- SO₂: Sulfur has an oxidation state of +4.
- SO₃: Sulfur has an oxidation state of +6.
- SiO₂: Silicon has an oxidation state of +4.
- Cl₂O₇: Chlorine has an oxidation state of +7.
- All of these oxides can react with water to form acids, indicating that they are acidic oxides.

6. **Count the Acidic Oxides**:
- The acidic oxides identified are:
- NO₂
- SO₂
- SO₃
- SiO₂
- Cl₂O₇
- This gives us a total of 5 acidic oxides.

### Final Answer:
Thus, the total number of acidic oxides among the given options is **5**.