Q56 of 65 Page 24

A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. Identify M and black coloured product and also explain the reaction of M with oxygen.

The metal M is Cu and the black coloured product is copper oxide (CuO). Copper does not react with acids but reacts with oxygen to form copper oxide. The reaction of metal M with oxygen is as follows:


2Cu + O2→ 2CuO


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