Match the reactions listed in column (I) with processes listed in column (II).
Column–I | Column–II | ||
(reactions) | (processes) | ||
(a) | 4 Au + 8 NaCN + 2 H2O + O2 (air) ⎯→ 4 Na[Au(CN)2] + 4 NaOH | (p) | Leaching |
(b) | CuFeS2 + 2 H2SO4 ⎯→ CuSO4 + FeSO4 + 2H2S | (q) | Smelting |
(c) | CaO + SiO2 CaSiO3 | (r) | Hydrometallurgy |
(d) | MgCl2.6H2O MgCl2 + 6H2O | (s) | Calcination |
Text Solution
Verified by ExpertsA
(A → p, r) ; (B → p, r) ; (C → q) ; (D → s)
Sol. Extraction of gold is a hydrometallurgical process in which gold ore is leached with NaCN solution and then precipitated by zinc scrap.
Extraction of copper is a hydrometallurgical process in which copper ore is leached with H 2 SO 4 solution and then precipitated by iron scrap.
Slag formation process is smelting.
Drying of hydrated MgCl 2 in presence of dry HCl gas is a calcination process.
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