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Find the number of following reactions which are involved in roasting process: i. S + 8O₂ → Δ 8SO₂ ↑ ii. P₄ + 5O₂ → Δ P₄O₁₀ ↑ iii. 4As + 3O₂ → Δ 2As₂O₃ ↑ iv. 2ZnS + 3O₂ → Δ 2ZnO + 2SO₂ ↑ v. ZnCO₃ → Δ 4ZnO + CO₂ ↑

1. 2
2. 3
3. 4
4. 5

Correct answer: 4

Solution

Four reactions are involved in the roasting process, including the conversion of sulphides to oxides and the release of SO₂ gas, as well as the oxidation of other species like phosphorus and arsenic.

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