12. In the equation 4M + 8CN- + 2H2O + O2 ___ 4 [M(CN)2]- + 4OH- the metal M is : (a) Copper (b) Iron (c) Gold (d) Zinc 13. For which ore of the metal, froth floatation process is used for concentration ? (a) Horn silver (b) Bauxite (c) Cinnabar (d) Haematite 14. Which of the following metal is leached by cyanide process ? (a) Ag (b) Na (c) Al (d) Cu
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