Which statement is wrong for NO ?

Options

A. It is anhydride of nitrous acid
B. Its dipole moment is 0.22 D
C. It forms dimer
D. It is paramagnetic

Explanation

To determine which statement is wrong for nitric oxide (NO), we will analyze each statement provided.

### Step-by-Step Solution:

1. **Identify the Statements**:
- Statement 1: "It is a hydride of nitrous acid."
- Statement 2: "Its dipole moment is 0.22 D."
- Statement 3: "It forms a dimer."
- Statement 4: "It is paramagnetic."

2. **Evaluate Statement 1**:
- Nitrous acid (HNO2) has a known hydride, which is N2O3 (dinitrogen trioxide). Therefore, saying that NO is a hydride of nitrous acid is incorrect.
- **Conclusion**: Statement 1 is wrong.

3. **Evaluate Statement 2**:
- The dipole moment of nitric oxide (NO) is indeed approximately 0.22 D. This statement is correct.
- **Conclusion**: Statement 2 is correct.

4. **Evaluate Statement 3**:
- NO can dimerize to form N2O2 (dinitrogen dioxide) under certain conditions. Thus, this statement is also correct.
- **Conclusion**: Statement 3 is correct.

5. **Evaluate Statement 4**:
- NO has an unpaired electron, which gives it paramagnetic properties. Therefore, this statement is correct as well.
- **Conclusion**: Statement 4 is correct.

6. **Final Conclusion**:
- The only statement that is wrong is Statement 1: "It is a hydride of nitrous acid."