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Isolation of Elements question

2021 · Shift 1 · Q15
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Isolation of Elements question

2021 · Shift 1 · Q15

JEE AdvancedChemistryIsolation of ElementsMultiple correct+4 / −2
The correct statement(s) related to the metal extraction processes is (are) :
  1. A
    A mixture of PbSPbSPbS and PbOPbOPbO undergoes self-reduction to produce PbPbPb and SO2SO_2SO2​
  2. B
    In the extraction process of copper from copper pyrites, silica is added to produce copper silicate.
  3. C
    Partial oxidation of sulphide ore of copper by roasting, followed by self-reduction produces blister copper.
  4. D
    In cyanide process, zinc powder is utilized to precipitate gold from Na[Au(CN)2{}_22​]
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