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Question
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.
Solution
Copper is the metal which does not react with acids to liberate hydrogen gas. With oxygen, it forms Copper Oxide.
Hence, metal M is copper and the black coloured product is copper oxide.
`2"Cu"("s") + "O"_2("g") -> 2"CuO"("s")`
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