Which of the following is the wrong statement?

Options

A. `ONCl` and `ONO^(-)` are not isoelectronic
B. `O_(3)` molecule is bent
C. Ozone is violet - black in solid state
D. Ozone is paramagnetic gas

Answer

To determine which statement is incorrect, let's analyze each statement step by step.

### Step 1: Analyze the first statement
**Statement**: O-N-Cl and O-N-O are not isoelectronic.

- **Count the total number of electrons**:
- For O-N-Cl:
- Oxygen (O) has 8 electrons.
- Nitrogen (N) has 7 electrons.
- Chlorine (Cl) has 17 electrons.
- Total = 8 + 7 + 17 = 32 electrons.

- For O-N-O:
- Oxygen (O) has 8 electrons.
- Nitrogen (N) has 7 electrons.
- The second Oxygen (O) also has 8 electrons.
- Total = 8 + 7 + 8 = 23 electrons.

- **Conclusion**: Since O-N-Cl has 32 electrons and O-N-O has 23 electrons, they are not isoelectronic. Thus, this statement is correct.

### Step 2: Analyze the second statement
**Statement**: O3 is a bent molecule.

- **Structure of Ozone (O3)**:
- Ozone has a bent shape due to the presence of a lone pair on the central nitrogen atom.
- The molecular geometry is described as bent or V-shaped.

- **Conclusion**: This statement is correct.

### Step 3: Analyze the third statement
**Statement**: Ozone is violet-black in solid form and blue in liquid form.

- **Physical properties of ozone**:
- Ozone (O3) is indeed violet-black in its solid state and appears blue in its liquid state.

- **Conclusion**: This statement is correct.

### Step 4: Analyze the fourth statement
**Statement**: Ozone is paramagnetic.

- **Electron configuration of Ozone**:
- Ozone has all paired electrons in its molecular structure.
- Therefore, it is diamagnetic, not paramagnetic.

- **Conclusion**: This statement is incorrect.

### Final Answer
The wrong statement is: **Ozone is paramagnetic.**

---