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  • 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

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.

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Metal M is Cu as Cu is less reactive than hydrogen. So, it does not react with acids to release hydrogen.
Cu\left ( s \right )+HCl\rightarrow No reaction
Copper metal does not burn in air even on strong heating.
Copper reacts with the oxygen on prolonged heating to form a black substance, i.e., copper (Il) oxide.
2Cu\left ( s \right )+O_{2}\left ( g \right )\rightarrow CuO\left ( s \right )

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