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When a mixture of cuprous oxide (Cu2O) and cuprous sulfide (Cu2S) is heated, what products are formed?

1. Cu2SO3
2. Cu and SO3
3. CuO and CuS
4. Cu and SO2

Correct answer: Cu and SO2

Solution

On heating, cuprous sulfide and cuprous oxide undergo self-reduction: 2Cu2O + Cu2S -> 6Cu + SO2. The products are copper metal and sulfur dioxide.

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