The reaction that does NOT define calcination is:

Engineering

Chemistry

Roasting Calcination or Smelting

Question

Fe₂O₃ · X H₂O $\overset{Δ}{\to}$ Fe₂O₃ + X H₂O

2Cu₂S + 3 O₂ $\overset{Δ}{\to}$ 2Cu₂O + 2 SO₂

CaCO₃ · MgCO₃ $\overset{Δ}{\to}$ CaO + MgO + 2CO₂

ZnCO₃ $\overset{Δ}{\to}$ ZnO + CO₂

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Calcination takes place in absence of air. Hence step 2 is not defining it.