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When copper oxide reacts with dilute HCl, the observation is that

Question
When copper oxide reacts with dilute HCl, the observation is that
The solution stays colourless
The blue solution turns colourless
The black copper oxide dissolves, giving a blue-green solution
There is no visible change
Answer
The black copper oxide dissolves, giving a blue-green solution
Detailed Explanation
The black copper oxide dissolves in the acid, and the solution turns blue-green due to copper(II) chloride formation.
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