Inforamtion about extraction of metals of lowe reactivity silver platnium and gold
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these metals are first converted to their oxides and then reduced to metals.
The oxides of the metals can be reduced to metals by only heating.
eg: 1) Ag2S + 2O2 -------- heat 2AgO + SO2
2 Ag2O --------heat 4Ag + O2
2) Au2S + 2O2------- heat 2AuO + SO2
2 Au2O3------ heat 4Au + 3O2
3) 2PtS + 3O2--------heat 2PtO + 2SO2
2PtO--------heat 2Pt + O2
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