When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains _______
(1) sulphides of copper (II) and iron (II)
(2) sulphides of copper (II) and iron (III)
(3) sulphides of copper (I) and iron (II)
(4) sulphides of copper (I) and iron (III)


Answer: Option 3
Explanation:
When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matte contains sulphides of copper (I) and iron (II). OR in other words, we can say that, Copper Matte is the mixture of copper sulphide (Cu2​S) and some iron sulphide (FeS). 

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