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When copper oxide is treated with hydrochloric acid, copper oxide disappears and the colour of the solution becomes blue-green. Which of the following is the reason for this change?

When copper oxide is treated with hydrochloric acid, copper oxide disappears and the colour of the solution becomes blue-green. Which of the following is the reason for this change? Correct Answer Neutralisation reaction

The correct answer is Neutralisation reaction.

Concept:

Chemical reaction:

  • It is a process in which one or more substances, the reactants, are converted to one or more different substances, the products.
  • A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Explanation:

Neutralization reaction:

  • In a neutralization reaction, an acid reacts with a base to form salt and water.
  • Acid + Base → Salt + water

​Reaction between Copper oxide and Hydrochloric acid:

  • Copper oxide is a metal oxide and thus basic in nature.
  • Hydrochloric acid is a strong acid.
  • Copper oxide reacts with hydrochloric acid to form copper chloride and water.
    • CuO + 2HCl → CuCl2 + H2O

So, in the case of the reaction of copper oxide and hydrochloric acid, salt which is copper chloride, and water are produced, thus it is an example of a neutralization reaction.

Additional InformationCombination reaction:

  • Two or more elements or compounds combine together to form a single compound.
  • Such reactions are represented by equations of the following form:     A + B → AB.

Reduction reaction:

  • Reduction means losing Oxygen or gaining hydrogen.
  • Reduction is accompanied by oxidation i.e., the addition of oxygen. 
  • The reduction and oxidation reaction is termed a redox reaction.

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