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Question
Of the given options, choose the combination that contains metals whose ores are most appropriate for roasting. In other words, Sulphide ores are common for which kind of metals?
Options:
A .  Ag, Cu, Pb
B .  Ag, Cu, Sn
C .  Ag, Mg, Pb 
D .  Al, Cu, Pb
Answer: Option A
:
A
Let us look at the chief ores of the given metals:
Copper: CuFeS2 (chalcopyrites).
Silver: Ag2S (Argentite)
Lead: PbS (Galena)

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