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A metal M does not liberate hydrogen fro...

A metal M does not liberate hydrogen from acids but reacts with oxygen Q 5 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 is less reactive than hydrogen. So, it does not react with acid to liberate hydrogen. Copper metal does not burn in air even on strong heating.
`Cu + HCI rarr "No reaction"`
Copper reacts with the oxygen of air on prologed heating to form a black substance copper (II) oxide.
`2Cu + O_(2) rarr 2CuO`
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