Anhydrous `AICI_(3)` is prepared by

Options

A. dissolving aluminium metal in cono. HCI
B. by heating a mixture of alumina with chlorine
C. by heating a mixtuer of alumina and carbon with dry chlorine
D. by heating alumina with dry HCI

Answer

To prepare anhydrous AlCl3 (aluminum chloride), we can follow these steps:

### Step 1: Understanding the Reactants
Anhydrous AlCl3 can be prepared from aluminum oxide (Al2O3) and chlorine gas (Cl2).

### Step 2: Heating Alumina with Chlorine
We can heat a mixture of alumina (Al2O3) with chlorine gas. This reaction is vigorous and produces aluminum chloride.

**Reaction:**
\[ \text{2 Al}_2\text{O}_3 + 6 \text{Cl}_2 \rightarrow 4 \text{AlCl}_3 + 3 \text{O}_2 \]

### Step 3: Alternative Method - Using Carbon
Another method involves heating alumina with carbon in the presence of dry chlorine. This also yields anhydrous AlCl3.

**Reaction:**
\[ \text{2 Al}_2\text{O}_3 + 6 \text{C} + 6 \text{Cl}_2 \rightarrow 4 \text{AlCl}_3 + 6 \text{CO} \]

### Step 4: Conclusion
The most effective methods to prepare anhydrous AlCl3 are:
1. Heating a mixture of alumina and chlorine.
2. Heating a mixture of alumina and carbon with dry chlorine.

### Final Answer:
Anhydrous AlCl3 is prepared by heating a mixture of alumina and carbon with dry chlorine.

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