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GATE 2020 MT – Question 42

Mineral Processing and Extractive Metallurgy · Non-ferrous extraction · 2 marks · Multiple choice

Match P blast-furnace ironmaking, Q Hall–Héroult, R basic-oxygen steelmaking, S Kroll process to mechanisms 1 metallothermic reduction, 2 oxidation, 3 carbothermic reduction, 4 fused-salt electrolysis.

  1. P–1, Q–4, R–2, S–3
  2. P–3, Q–1, R–2, S–4
  3. P–3, Q–4, R–2, S–1
  4. P–1, Q–2, R–3, S–4

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Show answer and explanation

Correct answer: (C) P–3, Q–4, R–2, S–1

Explanation

Blast-furnace ironmaking uses carbon and carbon monoxide as reductants, P–3. Hall–Héroult extracts aluminium by molten-salt electrolysis, Q–4. The BOF removes impurities by oxidation, R–2. Kroll reduces titanium chloride with magnesium, a metallothermic reduction, S–1. Therefore C.

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