(i) sulphides of copper (II) and iron (II)
(ii) sulphides of copper (II) and iron (III)
(iii) sulphides of copper (I) and iron (II)
(iv) sulphides of copper (I) and iron (III)
Correct Answer: (iii) sulphides of copper (I) and iron (II)
Explanation: The Copper matte contains sulphides of copper (I) and iron (II)