Which of the following statement are true about zeolite>
They are microporous structure of aluminosilicates.
Catalytic activity depends upon the pores and cavities of the zeolites.
Zeolites are not found in nature.
ZSM-5 is a zeolite.
Identify the correct option.

Options

A. I and III
B. I,II and III
C. I,II and IV
D. I and IV

Answer

To determine which statements about zeolites are true, we will analyze each statement one by one.

1. **Statement: They are microporous structures of aluminosilicates.**
- **Analysis:** Zeolites are indeed microporous materials composed of aluminosilicates. They have a framework structure where silicon (Si) and aluminum (Al) atoms are arranged in a three-dimensional network, with oxygen atoms bridging them. This structure creates small pores that can trap molecules.
- **Conclusion:** This statement is **true**.

2. **Statement: Catalytic activity depends upon the pores and cavities of the zeolites.**
- **Analysis:** The catalytic activity of zeolites is significantly influenced by their porous structure. The size and shape of the pores and cavities determine which molecules can enter and react within the zeolite, making them effective catalysts in various chemical reactions.
- **Conclusion:** This statement is **true**.

3. **Statement: Zeolites are not found in nature.**
- **Analysis:** This statement is incorrect. Zeolites are naturally occurring minerals and can be found in various geological formations. They are also synthesized for industrial applications, but they do exist in nature.
- **Conclusion:** This statement is **false**.

4. **Statement: ZSM-5 is a zeolite.**
- **Analysis:** ZSM-5 is a well-known synthetic zeolite that is widely used in catalytic processes, particularly in petroleum refining and petrochemical production. It has a unique pore structure that makes it valuable for specific reactions.
- **Conclusion:** This statement is **true**.

**Final Assessment:**
- True Statements: 1, 2, and 4.
- False Statement: 3.

**Correct Options: 1, 2, and 4 are true about zeolites.**

---