Which statements are correct for ozone?

Options

A. it is obtained by silent electric discharge on oxygen
B. it can be obtained by the action of ultraviolet rays on oxygen (modified)
C. it is regarded as an allotrope of oxygen
D. ozone molecules is paramagnetic like oxygen molecule

Answer

To determine which statements are correct for ozone, we can analyze each statement one by one.

### Step 1: Analyze the first statement
**Statement 1:** "Ozone is obtained by silent electric discharge on oxygen."

- **Explanation:** This statement is true. Ozone (O₃) can be produced by passing an electric current through dry oxygen (O₂) in a silent electric discharge. This process leads to the formation of ozone along with the release of heat.

### Step 2: Analyze the second statement
**Statement 2:** "Ozone can be obtained by the action of UV rays on oxygen."

- **Explanation:** This statement is also true. High-energy ultraviolet (UV) rays can split molecular oxygen (O₂) into atomic oxygen (O). These atomic oxygen atoms can then react with other O₂ molecules to form ozone (O₃).

### Step 3: Analyze the third statement
**Statement 3:** "Ozone is regarded as an allotrope of oxygen."

- **Explanation:** This statement is true as well. Allotropes are different forms of the same element in the same physical state. Ozone is indeed an allotrope of oxygen, existing alongside diatomic oxygen (O₂).

### Step 4: Analyze the fourth statement
**Statement 4:** "Ozone molecule is paramagnetic like oxygen molecule."

- **Explanation:** This statement is false. Ozone (O₃) is a diamagnetic substance, meaning it has no unpaired electrons. In contrast, molecular oxygen (O₂) is paramagnetic due to the presence of unpaired electrons in its molecular structure. Therefore, ozone does not exhibit the same magnetic properties as oxygen.

### Conclusion
Based on the analysis:
- Statements 1, 2, and 3 are correct.
- Statement 4 is incorrect.

Thus, the correct statements for ozone are: **1, 2, and 3.**

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