Find the FALSE Combination of a Metallurgical Process and Its

Multiple Choice

Find the FALSE combination of a metallurgical process and its example:

A) leaching: 4 Au(s) + 8 CN^-(aq) + O₂(g) + 2 H₂O(l) → 4 [Au(CN) ₂]^-(aq) + 4 OH^-(aq)
B) reduction: ZnCO₃(s) → ZnO(s) + CO₂(g)
C) roasting: 2 Cu₂S(s) + 3 O₂(g) → 2 Cu₂O(s) + 2 SO₂(g)
D) precipitation: Zn²⁺(aq) + S^2-(aq) → ZnS(s)
E) conversion: 2 Co(OH) ₃(s) Co₂O₃(s) + 3 H₂O(g)