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JEE Main202315 Apr 2023Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Which one of the following is not an example of calcination?

Options

  1. ACaCO 3 → ∆ CaO + CO 2
  2. BFe 2 O 3 . xH 2 O → ∆ Fe 2 O 3 + xH 2 O
  3. C2 PbS + 3 O 2 → ∆ 2 PbO + 2 SO 2
  4. DCaCO 3 . MgCO 3 → ∆ CaO + MgO + 2 CO 2

Correct answer

C. 2 PbS + 3 O 2 → ∆ 2 PbO + 2 SO 2

Step-by-step solution

Calcination is a process in which ore is heated in the absence of air or air might be supplied in a limited quantity. Roasting involves the heating of ore lower than its melting point in the presence of air or oxygen. 2 PbS + 3 O 2 → ∆ 2 PbO + 2 SO 2 The above reaction is an example of roasting. Rest all the reactions are heated in the absence of oxygen.

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