Which of the following reduction reaction CANNOT be carried out with coke?
Show Hint
- \(\mathrm{ZnO \to Zn}\)
- \(\mathrm{Fe_2O_3 \to Fe}\)
- \(\mathrm{Cu_2O \to Cu}\)
- \(\mathrm{Al_2O_3 \to Al}\)
The Correct Option is D
Solution and Explanation
\(\mathrm{Al_2O_3}\) is very stable (very negative \(\Delta_fG^\circ\) per mole of \(\mathrm{O_2}\)); carbon cannot reduce it at practical temperatures, and aluminium is obtained by electrolysis of alumina in molten cryolite (Hall-Heroult process).
Answer: (4) \(\mathrm{Al_2O_3 \to Al}\)
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