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The blue-green color of the solution is due to the formation of copper(ii) chloride in the reaction is an example of which kind of chemical reaction?
A. The reaction of metallic oxides with acids.
B. The reaction of non-metallic oxides with acids
C. The reaction of metallic oxides with base
D. The reaction of non-metallic oxides with bases.

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Last updated date: 13th Jun 2024
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Answer
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Hint: Copper (ii) chloride is the chemical compound with the chemical formula ${\text{CuC}}{{\text{l}}_{\text{2}}}$. The color of copper(ii) chloride is a light brown solid after absorption of moisture its color changes to blue-green.

Complete step by step answer: The formation of copper(ii) chloride is carried out by the chemical reaction between copper oxide and hydrochloric acid and the balanced chemical equation for the above reaction is given as:
$CuO + 2HCl \to CuC{l_2} + {H_2}O$
As we know metallic oxides are basic hence, copper oxide is basic i.e., when it reacts with hydrochloric acid it forms salt and water. Here copper is a weak base and hydrogen chloride is a strong acid hence copper oxide easily reacts with hydrogen chloride acid to form copper(ii) chloride and water.
Therefore, we can say the formation of copper(ii) chloride is an example of the reaction of metallic oxide with acid.
So, the correct answer is “Option A”.

Additional Information: The above reaction is known as neutralization reaction because neutralization reaction is defined as an acid-base type reaction which is non-redox in nature. The neutralization reaction involves the reaction of acid and base to form a salt and water as formed in the above reaction.

Note: Copper(ii) chloride is also known as copper di-chloride and it exists as a neutral tetracoordinate complex. It burns at low temperatures with a deep blue flame and is corrosive to aluminium, owing to the formation of tetrachlorocuprate ions. It is a moderate oxidizer and dissolves zinc and magnesium. It is widely used in printing, dyeing and as a wood preservative.