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Which of the reaction is suitable for concentrating ore by leaching process? (A) 2Cu2S + 3O2 → 2Cu2O + 2SO2 (B) Fe3O4 + CO → 3FeO + CO2 (C) Al2O3 + 2NaOH + 3H2O → 2Na[Al(OH)4] (D) Al2O3 + 6Mg → 6MgO + 4Al

1. (A) 2Cu2S + 3O2 → 2Cu2O + 2SO2
2. (B) Fe3O4 + CO → 3FeO + CO2
3. (C) Al2O3 + 2NaOH + 3H2O → 2Na[Al(OH)4]
4. (D) Al2O3 + 6Mg → 6MgO + 4Al

Correct answer: (B) Fe3O4 + CO → 3FeO + CO2

Solution

Option (B) is correct because the reaction involves the reduction of iron ore (Fe3O4) using carbon monoxide (CO), which is a common method in metallurgy for concentrating and extracting metals from their ores through leaching.

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