Q18 / 76 · NTA Abhyas (JEE Main) 2020 · Chemistry · General Principles and Processes of Isolation of Metals

The extraction principle used in extraction of a metal 'M' can be represented as follows

MS + 2 O 2 → MSO 4 MSO 4 + MS → 2 M + 2 SO 2

The metal 'M' is

  • A
    Mg
  • Correct answer
    B
    Pb
  • C
    Sn
  • D
    Fe

Solution

It is a case of self reduction.

The concentrated galena (PbS) is partially oxidised by adjusting the air supply.

PbS + 2 O 2 → PbSO 4

The temperature is raised, air supply reduced and fresh galena (PbS) added.

PbS + PbSO 4 → 2 Pb + 2 SO 2 ↑

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

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