Q15 / 90 · JEE Main 2021 (26 Aug Shift 2) · Chemistry

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 :

  • A
    Statement I is true but Statement II is false.
  • Correct answer
    B
    Both Statement I and Statement II are true.
  • C
    Both Statement I and Statement II are false.
  • D
    Statement I is false but Statement II is true.

Solution

Sphalerite is ZnS

Copper glance is Cu2S

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.

Hence, the correct answer is option: 'B'.

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