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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Why is a coloured solution formed in the reaction of copper oxide with dilute acid?

Answer and explanation

Correct answer: Copper salt forms

The governing reaction is neutralisation between a metal oxide and an acid. Copper oxide reacts with dilute hydrochloric acid to form copper chloride and water: CuO + 2HCl → CuCl₂ + H₂O. Dissolved copper(II) ions give the solution its characteristic blue-green colour. Therefore a copper salt forms; sugar, hydrogen gas, or water alone cannot explain the colour.

Related tags

Copper OxideCopper SaltsNeutralisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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10 more MCQs
  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
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  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
  8. 8A student dips red litmus paper into a soap solution. What change will occur in the red litmus paper?
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