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JEE Main201911 Jan 2019Evening ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

The reaction that does NOT define calcination is:

Options

  1. AFe ₂ O ₃ xH ₂ O Fe ₂ O ₃+ xH ₂ O
  2. B2 Cu ₂ ~S +3 O ₂ 2 Cu ₂ O +2 SO ₂
  3. CZnCO ₃ ZnO + CO ₂
  4. DCaCO ₃ MgCO ₃ CaO + MgO +2 CO ₂

Correct answer

B. 2 Cu ₂ ~S +3 O ₂ 2 Cu ₂ O +2 SO ₂

Step-by-step solution

Calcination involves heating of carbonates or hydrated oxides in absence of air. 2 Cu ₂ ~S +3 O ₂ 2 Cu ₂ O +2 SO ₂ ; is roasting (heating in a regular supply of air).

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