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Copper oxide with dilute hydrochloric acid: the compound and its colour

The same question, asked 3 times: 2023*, 2024*, 2026. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2023

    21 (A)
    A student took a small amount of copper oxide in a conical flask and added dilute hydrochloric acid to it with constant stirring. He observed a change in colour of the solution. (i) Write the name of the compound formed and its colour. (ii) Write a balanced chemical equation for the reaction involved.

  2. Question 2

    2024

    27
    A small amount of copper oxide was taken in a beaker and dilute hydrochloric acid was added with continuous stirring of the solution. Name the compound formed and state the colour of its solution. Write balanced chemical equation for the reaction that occurs. Based on the reaction, state the nature (acidic/basic) of copper oxide.

  3. Question 3

    2026

    18
    To a small amount of copper oxide in a beaker, when we add dilute hydrochloric acid slowly with stirring, the change in the colour of the solution is due to the formation of :

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