MetallurgyHard
Question
The chemical treatment of the ore for concentration is done in the case of :
Options
A.aluminium
B.silver
C.copper
D.gold
Solution
Leaching is done with suitable chemical reagents to dissolve the ores of Al, Ag and Au.
Al2O3(s) + 2NaOH(aq) + 3H2O(l) → 2Na[Al(OH)4](aq)
4M(s) + 8CN-(aq) + 2H2O(aq) + O2(g) → 4[M(CN)2]- (aq) + 4OH-(aq) (M = Ag or Au)
Al2O3(s) + 2NaOH(aq) + 3H2O(l) → 2Na[Al(OH)4](aq)
4M(s) + 8CN-(aq) + 2H2O(aq) + O2(g) → 4[M(CN)2]- (aq) + 4OH-(aq) (M = Ag or Au)
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