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It is formed along with copper(I) oxide prepared by heating copper(II) nitrate, copper(II) hydroxide or copper(II) carbonate: such like;
CuCO3 ¡ú CuO + CO2

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Copper(II) oxide is a basic oxide, so it dissolves in mineral acids such as hydrochloric acid, Sulfuric acid or nitric acid to give the
corresponding copper(II) salts:
CuO + 2 HNO3 ¡ú Cu(NO3)2 + H2O
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It can also be reduced to copper metal using hydrogen or carbon monoxide:
H2 + CuO ¡ú Cu + H2O
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