Question

what happens if a mixture of CuO and CuS is heated ​

Answer 1

Answer:

When a mixture of Cu2O and Cu2S is heated, they react together to give copper metal and sulphur dioxide gas. This is one of the methods used to reduce sulphide ore of less reactive copper to copper metal.

Explanation:

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Answer 2

Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water.