Hydrated `AICI_(3)` is used as

Options

A. Catalyst in cracking of petroleum
B. Catalyst in Friedel Craft reaction
C. Mordant
D. All of these

Explanation

To answer the question about the uses of hydrated AlCl3 (aluminum chloride), we can break down the information into clear steps.

### Step-by-Step Solution:

1. **Identify the Compound**:
- The compound in question is hydrated aluminum chloride, denoted as AlCl3·xH2O, where 'x' represents the number of water molecules associated with the aluminum chloride.

2. **Understand Hydrated AlCl3**:
- Hydrated AlCl3 is a form of aluminum chloride that contains water molecules. It is different from anhydrous AlCl3, which does not contain water.

3. **Determine Uses of Hydrated AlCl3**:
- Hydrated AlCl3 is primarily used as a **mordant** in dyeing processes. A mordant is a substance that helps fix dyes onto fabrics, enhancing the color and durability of the dye.

4. **Other Applications**:
- In addition to being a mordant, hydrated AlCl3 can also be used in various industrial processes, including the drying industry, where it may help in moisture control.

5. **Conclusion**:
- Thus, hydrated AlCl3 is used mainly as a mordant in dyeing and in moisture control applications in the drying industry.

### Final Answer:
Hydrated AlCl3 is used as a mordant in dyeing processes and in the drying industry.