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Identify the incorrect statement among the following about metallurgical processes.

1. The slag produced during extraction of iron is heavy and has a lower melting point than iron.
2. Below approximately 983 K, CO is the chief reducing agent in the blast furnace.
3. In zone refining, impurities migrate in the direction of the moving heater.
4. The electrolytic reduction of Al2O3 to obtain aluminium is called the Hall-Heroult process.

Correct answer: The slag produced during extraction of iron is heavy and has a lower melting point than iron.

Solution

Slag is lighter (less dense) than molten iron and therefore floats on top; calling it 'heavy' is incorrect. Its lower melting point compared to iron is correct, but the claim of being heavy is the factual error. All other statements are accurate.

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