What do you observe when:
a paste of copper oxide is heated in a charcoal cavity.

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Solution

Observation:
When copper oxide(CuO) is heated with charcoal, carbon dioxide (CO₂)gas prodeuced.
Test for carbon dioxide gas:
Gas eveolve in the reaction passes through calcium hydroxide(lime water).
White precipitate of calcium carbonate is formed.
2CuO(s) + C(s) → 2Cu(s) + CO₂(g)

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