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Question

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


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Solution

Reaction of Copper with Acid:

  • Copper Cu lies below hydrogen in the reactivity series. Thus it will not react with Sulfuric acid or Hydrochloric acid and hence there will be no evolution of Hydrogen(H2) gas.
  • Cu(s)Copper+HCl(aq)HydrochloricacidNoreaction

Reaction of Copper with Oxygen:

  • The reaction of CopperCu with oxygenO2 produces a black-colored copper oxide CuO.
  • The chemical reaction can be depicted as:

2Cu(s)+O2(g)2CuO(s)

  • It is an example of a combination reaction.

Hence, M is Copper and the black-colored product is Copper oxide.


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