In electrometallury of aluminium , what will happen if graphite rodes are not used as anode and are replaced by some other metal ?

Options

A. `O_(2)` liberated at node will react with aluminium to give back `Al_(2)O_(3)`
B. `F_(2)` will be liberated at anode instead of `O_(2)`
C. The process of electrometallurgy will become non-spontaneous
D. Aluminium oxide splits into `Al^(3+)` and `O^(2-)` ions only in presence of graphite

Explanation

### Step-by-Step Solution:

1. **Understanding the Electrolytic Process**: In the electrolysis of aluminum, aluminum oxide (Al2O3) is dissolved in molten cryolite (Na3AlF6) and subjected to electrolysis. The electrolysis produces aluminum metal at the cathode and oxygen gas at the anode.

2. **Role of Graphite Anodes**: Graphite rods are used as anodes in this process. When oxygen is liberated at the anode, it reacts with the carbon (graphite) to form carbon dioxide (CO2). This reaction is exothermic and helps maintain the temperature of the electrolytic cell.

3. **Consequences of Replacing Graphite with Another Metal**: If the graphite rods are replaced with another metal, the following issues may arise:
- The metal anode may not react with oxygen to form CO2, which means that the liberated oxygen could react with aluminum instead, leading to the formation of aluminum oxide (Al2O3) again.
- This would hinder the production of aluminum as the aluminum oxide would not be reduced to aluminum metal.

4. **Analyzing the Options**:
- **Option 1**: O2 liberated at the anode will react with aluminum to give back Al2O3. This is a likely scenario if a non-carbon anode is used.
- **Option 2**: F2 will be liberated at the anode instead of O2. This is incorrect as fluorine is not produced in this process.
- **Option 3**: The process of electrometallurgy will become non-spontaneous. This is not necessarily true; the process may still be spontaneous, but the efficiency will be affected.
- **Option 4**: Aluminum oxide is fit into Al+3 and O2-2 ions only in the presence of graphite. This is also true, as graphite facilitates the reaction.

5. **Conclusion**: The most accurate consequence of not using graphite as an anode is that the oxygen liberated at the anode will react with aluminum to reform aluminum oxide (Al2O3), thus hindering the production of aluminum.

### Final Answer:
If graphite rods are not used as anodes in the electrometallurgy of aluminum, the oxygen liberated at the anode will react with aluminum to give back Al2O3.

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