Question:
Carbon cannot be used in the reduction of $Al₂O₃$ because ________.
Carbon cannot be used in the reduction of $Al₂O₃$ because ________.
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Carbon cannot be used in the reduction of $Al2O3$ because ____.
Updated On: Apr 15, 2026
- it is an expensive proposition
- the enthalpy of formation of $CO_{2}$ is more than that of $Al_{2}O_{3}$
- pure carbon is not easily available
- the enthalpy of formation of $Al_{2}O_{3}$ is too high
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The Correct Option is D
Solution and Explanation
Step 1: Chemical Reactivity
Aluminum has a very high affinity for oxygen.
Step 2: Thermodynamic Analysis
The enthalpy of formation of $Al_{2}O_{3}$ is extremely high (very negative), meaning the Al-O bond is exceptionally strong.
Step 3: Comparison with Carbon
Carbon is not a strong enough reducing agent to overcome this high enthalpy and displace oxygen from alumina.
Final Answer: (D)
Aluminum has a very high affinity for oxygen.
Step 2: Thermodynamic Analysis
The enthalpy of formation of $Al_{2}O_{3}$ is extremely high (very negative), meaning the Al-O bond is exceptionally strong.
Step 3: Comparison with Carbon
Carbon is not a strong enough reducing agent to overcome this high enthalpy and displace oxygen from alumina.
Final Answer: (D)
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