alleryIn the leaching concentration of bauxite, the ore is soaked in which kind of solution?
AAqueous copper sulphate
BConcentrated nitric acid
CAqueous sodium hydroxide
DLiquid pine oil
Answer & Solution
Correct answer: C. Aqueous sodium hydroxide
1. Leaching dissolves the desired ore ingredient in a chosen solution while gangue stays behind.
2. For bauxite, it is soaked in aqueous NaOH or aqueous Na2CO3.
3. This dissolves the alumina, separating it from the insoluble gangue.
4. Nitric acid and copper sulphate are not the leaching agents here, so they are incorrect.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.111_
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