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Which of the following will be formed when dilute hydrochloric acid is added to a beaker having copper oxide?
A solution with blue-green colour is formed due to the formation of copper (III) chloride.
A solution with green colour is formed due to the formation of copper (II) chloride.
A colourless solution is formed due to the formation of copper (II) chloride.
A solution with blue-green colour is formed due to the formation of copper (II) chloride.
A solution with blue-green colour is formed due to the formation of copper (II) chloride.
When dilute hydrochloric acid (HCl) reacts with copper (II) oxide (CuO), a neutralisation reaction occurs to form copper (II) chloride (CuCl2тАЛ) and water. The resulting solution exhibits a characteristic blue-green color due to the presence of hydrated copper (II) ions.
When dilute hydrochloric acid (HCl) reacts with copper (II) oxide (CuO), a neutralisation reaction occurs to form copper (II) chloride (CuCl2тАЛ) and water. The resulting solution exhibits a characteristic blue-green color due to the presence of hydrated copper (II) ions.
Think of it like mixing a blue paint pigment into a solution; just as the presence of copper salts gives water a unique blue-green tint, dissolving an antacid tablet (a base) in vinegar (an acid) creates a new chemical result.
CuO(s)+2HCl(aq)тЖТCuCl2тАЛ(aq)+H2тАЛO(l) тАФ The balanced chemical equation for the reaction of copper (II) oxide with dilute hydrochloric acid.
This is a typical reaction between a metal oxide (which is basic in nature) and an acid. The reaction follows the general pattern: Metal Oxide + Acid тЖТ Salt + Water. The Cu2+ ions formed in the aqueous solution interact with water molecules to produce the distinct blue-green color, which is a diagnostic feature of copper (II) chloride in solution.
Metal oxides are basic; therefore, they react with acids to form salt and water.
Copper (II) chloride is the resulting salt, which is soluble in water.
The blue-green color is specific to the copper (II) species in aqueous solution.
Demonstrates fundamental neutralisation properties of metal oxides.
Used in laboratory synthesis of copper salts.
Serves as a qualitative test to identify copper-based compounds.
Copper (II) is the most stable oxidation state of copper in aqueous acidic conditions.
Option A is incorrect because Copper (III) is unstable and not formed in this reaction.
Option B is partially correct regarding the salt name but less accurate than D regarding the observed color, which is characteristically blue-green.
Option C is incorrect because the solution is distinctly colored, not colourless.
D is correct тАФ The reaction produces copper (II) chloride, which gives a characteristic blue-green color to the aqueous solution.
Always remember that transition metal salts in aqueous solutions are often colored due to d-d electronic transitions, a key concept in both inorganic chemistry and competitive exams.
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