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The reaction that does NOT define calcination is :

1. 2Cu 2 S + 3O 2 ⎯→ ⎯ Δ 2Cu 2 O + 2SO 2
2. CaCO 3 . MgCO 3 ⎯→ ⎯ Δ 2 CO 2 MgO CaO + +
3. ZnCO 3 ⎯→ ⎯ Δ ZnO + CO 2
4. Fe 2 O 3 . XH 2 O ⎯→ ⎯ Δ Fe 2 O 3 + XH 2 O

Correct answer: 2Cu 2 S + 3O 2 ⎯→ ⎯ Δ 2Cu 2 O + 2SO 2

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