Question

How can you convert red oxide to black and vice versa? ​

Answer 1

Explanation:

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Red Copper oxide is Copper(I) oxide Cu2O. Black Copper oxide is Copper(II) oxide CuO. Copper(I) oxide is oxidised to Copper(II) oxide in moist air. Copper(I) oxide is oxidised to Cu(II) by dissolving in dilute nitric acid which can be thermally decomposed to Copper (II) oxide by heating at 180℃.

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