Sulfide ores are ores where the metal is found combined with sulfur (S). Many metals, especially heavy and less reactive ones, commonly occur as sulfides because sulfur forms stable compounds with them.

Let's analyze the options:

Option 1: Ag, Cu and Sn

• Silver (Ag): Common ore is Argentite (${\mathrm{Ag}}_{2}S$)
• Copper (Cu): Common ore is Copper glance (${\mathrm{Cu}}_{2}S$)
• Tin (Sn): Main ore is Cassiterite ($\mathrm{Sn}{O}_2$), which is an oxide, not a sulfide.

This option is incorrect because Tin does not have a common sulfide ore.

Option 2: Al, Cu and Pb

• Aluminum (Al): Main ore is Bauxite (a mixture of oxides), not a sulfide.
• Copper (Cu): Has sulfide ores.
• Lead (Pb): Common ore is Galena ($\mathrm{PbS}$).

This option is incorrect because Aluminum does not have a common sulfide ore.

Option 3: Ag, Cu and Pb

• Silver (Ag): Has sulfide ore (Argentite, ${\mathrm{Ag}}_{2}S$).
• Copper (Cu): Has sulfide ore (Copper glance, ${\mathrm{Cu}}_{2}S$; Chalcopyrite, $\mathrm{CuFe}{S}_2$).
• Lead (Pb): Has sulfide ore (Galena, $\mathrm{PbS}$).

All three metals have common sulfide ores. This appears to be the correct option.

Option 4: Ag, Mg and Pb

• Silver (Ag): Has sulfide ore.
• Magnesium (Mg): It is a highly reactive metal. It is found in the sea as $\mathrm{MgCl}2$ and in the earth's crust as Dolomite ($\mathrm{MgCO}3$.CaCO3) and Magnesite ($\mathrm{MgCO}3$). It does not form a common sulfide ore.
• Lead (Pb): Has sulfide ore.

This option is incorrect because Magnesium does not have a common sulfide ore.

Final Answer: The correct option is Ag, Cu and Pb.

Related Topics & Formulae

Common Ores of Metals: The form in which a metal is found in nature depends on its chemical reactivity. The most reactive metals (K, Na, Ca, Mg, Al) are found as chlorides, oxides, or carbonates. Less reactive metals (Zn, Fe, Pb, Cu) are found as oxides, sulfides, or carbonates. The least reactive metals (Ag, Au, Pt) are found in the native state.

Important Sulfide Ores:

• Zinc: Zinc Blende ($\mathrm{ZnS}$)
• Iron: Iron Pyrites ($\mathrm{FeS}2$)
• Mercury: Cinnabar ($\mathrm{HgS}$)
• Antimony: Stibnite (${\mathrm{Sb}}_2{S}_3$)
• Arsenic: Realgar ($\mathrm{As}4$S4)