Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> 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.

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Copper is the metal which does not react with acids. With oxygen, it forms Copper Oxide.
Metal M is Copper and black coloured product is copper oxide.
2Cu + $O_2$ → 2CuO