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JEE Main202124 Feb 2021Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Which of the following ore is concentrated using group 1 cyanide salt?

Options

  1. AMalachite
  2. BCalamine
  3. CSiderite
  4. DSphalerite

Correct answer

D. Sphalerite

Step-by-step solution

Sphalerite ore: ZnS Calamine ore: ZnCO 3 Siderite ore: FeCO 3 Malachite ore: Cu OH 2 · CuCO 3 It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants'. In case of an ore containing ZnS and PbS , the depressant used is NaCN .

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