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If copper is kept open in air, it slowly losses its shining brown surface and gains a green coating. It is due to the formation of
- a)CuO
- b)CuSO4
- c)CuCO3
- d)Cu (NO3)2
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
If copper is kept open in air, it slowly losses its shining brown surf...
Reason for the Formation of Green Coating on Copper:
When copper is exposed to air, it slowly loses its shining brown surface and gains a green coating. This green coating is known as copper carbonate (CuCO3) or copper(II) carbonate hydroxide (Cu2CO3(OH)2), which is commonly known as verdigris. The formation of this green coating is primarily due to the reaction of copper with carbon dioxide and moisture present in the air.
Explanation:
1. Reaction with Carbon Dioxide:
- Copper reacts with carbon dioxide present in the air to form copper(II) oxide (CuO).
- The reaction can be represented as:
2Cu + O2 + CO2 → 2CuO + CO
- Copper(II) oxide is a black compound.
2. Reaction with Moisture:
- Copper(II) oxide further reacts with moisture present in the air to form copper(II) hydroxide (Cu(OH)2).
- The reaction can be represented as:
CuO + H2O → Cu(OH)2
- Copper(II) hydroxide is a blue compound.
3. Reaction with Carbon Dioxide and Moisture:
- Copper(II) hydroxide reacts with carbon dioxide present in the air to form copper carbonate (CuCO3).
- The reaction can be represented as:
Cu(OH)2 + CO2 → CuCO3 + H2O
- Copper carbonate is a green compound.
Conclusion:
The formation of the green coating on copper is due to the reaction of copper with carbon dioxide and moisture present in the air. Initially, copper reacts with carbon dioxide to form copper(II) oxide, which further reacts with moisture to form copper(II) hydroxide. Finally, copper(II) hydroxide reacts with carbon dioxide to form copper carbonate. This copper carbonate coating gives the characteristic green color to the surface of the copper.
When copper is exposed to air, it slowly loses its shining brown surface and gains a green coating. This green coating is known as copper carbonate (CuCO3) or copper(II) carbonate hydroxide (Cu2CO3(OH)2), which is commonly known as verdigris. The formation of this green coating is primarily due to the reaction of copper with carbon dioxide and moisture present in the air.
Explanation:
1. Reaction with Carbon Dioxide:
- Copper reacts with carbon dioxide present in the air to form copper(II) oxide (CuO).
- The reaction can be represented as:
2Cu + O2 + CO2 → 2CuO + CO
- Copper(II) oxide is a black compound.
2. Reaction with Moisture:
- Copper(II) oxide further reacts with moisture present in the air to form copper(II) hydroxide (Cu(OH)2).
- The reaction can be represented as:
CuO + H2O → Cu(OH)2
- Copper(II) hydroxide is a blue compound.
3. Reaction with Carbon Dioxide and Moisture:
- Copper(II) hydroxide reacts with carbon dioxide present in the air to form copper carbonate (CuCO3).
- The reaction can be represented as:
Cu(OH)2 + CO2 → CuCO3 + H2O
- Copper carbonate is a green compound.
Conclusion:
The formation of the green coating on copper is due to the reaction of copper with carbon dioxide and moisture present in the air. Initially, copper reacts with carbon dioxide to form copper(II) oxide, which further reacts with moisture to form copper(II) hydroxide. Finally, copper(II) hydroxide reacts with carbon dioxide to form copper carbonate. This copper carbonate coating gives the characteristic green color to the surface of the copper.
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Community Answer
If copper is kept open in air, it slowly losses its shining brown surf...
The green coating is due to the formation of basic copper carbonate CuCO3.Cu(OH)2.
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If copper is kept open in air, it slowly losses its shining brown surface and gains a green coating. It is due to the formation ofa)CuOb)CuSO4c)CuCO3d)Cu (NO3)2Correct answer is option 'C'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about If copper is kept open in air, it slowly losses its shining brown surface and gains a green coating. It is due to the formation ofa)CuOb)CuSO4c)CuCO3d)Cu (NO3)2Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If copper is kept open in air, it slowly losses its shining brown surface and gains a green coating. It is due to the formation ofa)CuOb)CuSO4c)CuCO3d)Cu (NO3)2Correct answer is option 'C'. Can you explain this answer?.
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