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In the reaction CuO + H2 --heat--> Cu + H2O, which substance is being reduced?

Question
In the reaction CuO + H2 --heat--> Cu + H2O, which substance is being reduced?
Hydrogen
Copper(II) oxide (CuO)
Water
Copper metal
Answer
Copper(II) oxide (CuO)
Detailed Explanation
Copper(II) oxide loses oxygen in this reaction (becoming copper metal), so CuO is being reduced.
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