In hydrometallurgical process for the extraction of copper

• A

  The copper ore is leached with bacteria or by using sulphuric acid

• B

  Hydrometallurgical process is echo friendly because the sulphur content of the ore is oxidized to sulphate instead of liberating pollutant ${\mathrm{SO}}_2$ gas 

• C

  From the solution copper is recovered by using more electropositive metal line zinc or scrap iron

• D

  In hydrometallurgical process copper is obtained by the electrolytic reduction