Question

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6. Name the black substance formed on the surface of copper metal
when it is heated in air.​

Answer 1

Copper oxide.

valency of copper = 2+

valency of oxygen= 2-

metals have strong affinity for oxygen and thus, heated copper reacts with oxygen to form black copper oxide.

Answer 2

The black coloured substance is copper oxide or CuO. When oxygen which is present in the air starts to react with copper, a layer of copper oxide will be formed.

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