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When copper(II) oxide is heated with hydrogen gas, the black substance changes into a reddish-brown substance. What is the reddish-brown substance?

Answer and explanation

Correct answer: Copper

The correct answer is copper. On heating, hydrogen removes oxygen from black copper(II) oxide, reducing it to copper: \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\). The copper formed is reddish-brown. Copper(II) sulphate, chloride, or carbonate cannot form because no source of sulphate, chloride, or carbonate ions is present in the reaction.

Related tags

ScienceClass 10Chemical ReactionsReductionCopper OxideHydrogen

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