Copper Oxide is taken in a beaker and dilute HCl is slowly added by strring. What happens to the colour of the solution ?
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When dilute HCl is added to a small amount of copper oxide in a beaker, a greenish yellow gas is released and bluish green solution is formed. Since, the metal oxides such as Copper oxide (CuO) is basic in nature, it reacts with acids such as HCl to form the corresponding salt and water.
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CuO+2HCl ----------> CuCl₂+H₂O
the solution turns into blue color in the presence of copper chloride
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