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Concentration of ore - class-XII

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Multiple Choice

What is the process of leaching in case of low grade copper ores?

  1. Leaching is carried out with $NaOH$ and $O _2$
  2. Leaching is carried out with $NaCN$
  3. Leaching is carried out with acids in presence of $O _2$
  4. Leaching is carried out by boiling the ore with water
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