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प्रश्न
Which of the reaction is suitable for concentrating ore by leaching process?
विकल्प
\[\ce{2Cu2S + 3O2 -> 2Cu2O + 2SO2}\]
\[\ce{Fe3O4 + CO -> 3FeO + CO2}\]
\[\ce{Al2O3 + 2NaOH + 3H2O -> 2Na[Al(OH)4]}\]
\[\ce{Al2O3 + 6Mg -> 6MgO + 4Al}\]
MCQ
उत्तर
\[\ce{Al2O3 + 2NaOH + 3H2O -> 2Na[Al(OH)4]}\]
Explanation:
In the leaching process, chemicals are used to treat the ore to turn the valuable metals into soluble salts while leaving the impurities insoluble.
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