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Match each ore in List I with the type of reduction process used in its metallurgical extraction in List II: List I: (P) SnO2 (cassiterite); (Q) CuFeS2 (chalcopyrite); (R) NaCl (rock salt); (S) MnO2 (pyrolusite). List II: (1) Self reduction; (2) Carbon reduction; (3) Electrolytic reduction; (4) Aluminothermic process.
- P-2, Q-1, R-3, S-4
- P-2, Q-1, R-4, S-3
- P-1, Q-2, R-4, S-3
- P-1, Q-3, R-2, S-4
Correct answer: P-2, Q-1, R-3, S-4
Solution
P (SnO2): reduced by coke/carbon in a blast furnace — carbon reduction (2). Q (CuFeS2): after roasting to Cu2S, self-reduction by Cu2S + Cu2O -> Cu + SO2 (1). R (NaCl): electrolytic reduction in Down's cell (3). S (MnO2): reduced by aluminium in Goldschmidt thermite process (4). Matching: P-2, Q-1, R-3, S-4.
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