Which of the following halide can be converted into anhydrous form on heating :-

Options

A. `BeCl_(2)*H_(2)O`
B. `KCl *6H_(2)O`
C. `AlCl_(3)*6H_(2)O`
D. `FeCl_(2) *6H_(2)O`

Explanation

To determine which halide can be converted into an anhydrous form upon heating, we need to analyze the given options based on their ionic or covalent character and their ability to lose water of crystallization.

### Step-by-Step Solution:

1. **Understanding Anhydrous Form**:
- Anhydrous means a substance that does not contain water. When a hydrated compound is heated, it can lose its water molecules to form an anhydrous compound.

2. **Analyzing Beryllium Chloride (BeCl2)**:
- Beryllium chloride (BeCl2) is known to have a covalent character due to the small size of the Be²⁺ ion and the large size of the Cl⁻ ion.
- The high polarization leads to a significant covalent character, which means it does not easily lose water to form an anhydrous form.
- **Conclusion**: BeCl2 cannot be converted to an anhydrous form upon heating.

3. **Analyzing Potassium Chloride (KCl·6H2O)**:
- Potassium chloride (KCl) is an ionic compound. It can easily lose its water of crystallization when heated.
- On heating, KCl·6H2O will lose the 6 water molecules and convert to anhydrous KCl.
- **Conclusion**: KCl can be converted to an anhydrous form upon heating.

4. **Analyzing Aluminum Chloride (AlCl3·6H2O)**:
- Aluminum chloride (AlCl3) also exhibits covalent character. When heated, it decomposes into Al2O3 and HCl, along with water.
- This means that it does not simply lose water to become an anhydrous form; its chemical composition changes.
- **Conclusion**: AlCl3 cannot be converted to an anhydrous form upon heating.

5. **Analyzing Iron(II) Chloride (FeCl2·6H2O)**:
- Iron(II) chloride (FeCl2) similarly has covalent character. Upon heating, it decomposes into Fe2O3, HCl, and water.
- Like AlCl3, it does not just lose water but undergoes a chemical change.
- **Conclusion**: FeCl2 cannot be converted to an anhydrous form upon heating.

### Final Answer:
The halide that can be converted into an anhydrous form upon heating is **KCl (Potassium Chloride)**.