`SO_3` exists in

Options

A. 3 forms
B. 2 forms
C. 4 forms
D. Only one

Answer

To determine how many forms sulfur trioxide (SO₃) exists in, we can analyze the information provided about its structural forms and characteristics.

### Step-by-Step Solution:

1. **Understanding SO₃**:
- Sulfur trioxide (SO₃) is a chemical compound consisting of one sulfur atom and three oxygen atoms. It is known for its various structural forms.

**Hint**: Recall the basic structure of SO₃ and its components.

2. **Identifying the Forms**:
- SO₃ exists in three distinct forms:
- **Alpha Form**: This form is described as fibrous and stringy.
- **Beta Form**: This form has a feathery and silk-like appearance.
- **Gamma Form**: This form is characterized as eye-like.

**Hint**: Think about how different physical forms can arise from the same chemical compound based on molecular arrangement.

3. **Conclusion**:
- Based on the information, we conclude that sulfur trioxide (SO₃) exists in three forms: alpha, beta, and gamma.

**Hint**: Remember to summarize your findings clearly to arrive at the final answer.

### Final Answer:
SO₃ exists in **three forms**: alpha, beta, and gamma.