Question

Q.1) A greenish coating develops on copper utensils due to formation of?

(a) CuCo3
(b) Cu(OH)2
(c) Cu(OH)2.CuCO3
(d) CuO

Answer 1

Cu(OH)2.CuCO3

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Answer 2

The right response to the given question that is the green coat substance is (C) Cu(OH)2.CuCO3.

• The copper utensils react with the oxygen in the air.
• It also reacts with wet air, commonly known as humid air, which is made up of oxygen and hydroxide atoms.
• When exposed to damp air for an extended period of time, all copper vessels develop a green-colored deposit over their exterior or outer surface.
• Copper erodes via oxidation, which occurs when copper interacts with atmospheric oxygen to generate copper oxide.
• Copper oxide subsequently reacts to carbon dioxide to form copper carbonate, which is colored greenish.
• Copper corrosion is the name for this process.
• The green substance formed as a deposit on the surface is the result of two substances namely hydroxide of copper (Cu(OH)₂) and carbonate of copper (CuCO₃).
• It can be expressed using chemical reaction as below:
• Cu metal + H₂O gas + CO₂ gas + O₂ gas => (Cu(OH)₂)(hydroxide) + (CuCO₃)(carbonate)
• Hence, option c is the correct answer.