KCET · Chemistry · General Principles and Processes of Isolation of Metals
Carbon cannot reduce \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) to \(\mathrm{Fe}\) at a temperature below \(983 \mathrm{~K}\) because
- A free energy change for the formation of \(\mathrm{CO}\) is more negative than that of \(\mathrm{Fe}_{2} \mathrm{O}_{3}\)
- B \(\mathrm{CO}\) is thermodynamically more stable than \(\mathrm{Fe}_{2} \mathrm{O}_{3}\)
- C carbon has higher affinity towards oxygen than iron
- D iron has higher affinity towards oxygen than carbon
Answer & Solution
Correct Answer
(D) iron has higher affinity towards oxygen than carbon
Step-by-step Solution
Detailed explanation
Below \(983 \mathrm{~K}\), conversion of iron to ferric oxide is more favourable.
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