When copper powder is heated, it gets coated with
Black copper oxide
Yellow copper oxide
Red copper oxide
Brown copper oxide

When copper turnings and concentrated HCl is heated with copper sulphate the compound formed is

In an experiment 2.16 g of copper was dissolved in nitric acid followed by ignition of the nitrate, which gave 2.70 g of copper oxide. In another experiment 1.46 g of copper on heating in a curent of air gave 1.83 g of copper. Oxide. The percentage of copper in copper oxide is _____________ and the abvoe data illustrate the law of ____________.

(a) Example the folloeing in terms of gain or loss of oxygen with one example each : (b) When copper powder is heated strongly in air, it forms copper oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.

On heating copper powder in air, the surface of copper powder becomes coated with black CuO. How can this black coating be converted into brown copper ? Write chemical equation for the reaction that occurs during the colour change.

Reduction of copper (1) oxide with copper (1) sulphide.

Extraction of copper from cuprous oxide [copper(1) oxide]|Refining |Summary