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Heating mixture of Cu2O and Cu2S will give

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

Correct answer: Cu + SO2

Solution

When Cu2O (copper(I) oxide) and Cu2S (copper(I) sulfide) are heated together, they undergo a reduction reaction that produces elemental copper (Cu) and sulfur dioxide (SO2) as a result of the oxidation of sulfur from Cu2S.

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