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JEE Main202126 Aug 2021Evening ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Given below are two statements: Statement I : Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper. Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a froth flotation method. Choose the most appropriate answer from the options given below :

Options

  1. AStatement I is true but Statement II is false.
  2. BBoth Statement I and Statement II are true.
  3. CBoth Statement I and Statement II are false.
  4. DStatement I is false but Statement II is true.

Correct answer

B. Both Statement I and Statement II are true.

Step-by-step solution

Sphalerite is ZnS Copper glance is Cu 2 S It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants'. For example, in case of an ore containing ZnS and PbS , the depressant used is NaCN . It selectively prevents ZnS from coming to the froth but allows PbS to come with the froth.

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