Question
Explain why, when a copper object remains in damp air for a considerable time, a green coating is formed on its surface. What is this process known as?
✓
Answer
When a copper object remains in damp air for a considerable time, then copper reacts slowly with the carbon dioxide and water of air to form a green coating of basic copper carbonate on the surface of the object. The formation of this green coating of basic copper carbonate corrodes it. This process is known as corrosion of copper.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Some of the fungal hyphe are aerial and bear black blobs. What are these bulb-like structures on sticks called in Rhizopus?
Explain clearly why, a person who has lost the sight of one eye is at a disadvantage compared with the normal person who has two good eyes.
A student sitting in the last row of the class-room is not able to read clearly the writing on the
blackboard.
blackboard.
- Name the type of defect he is suffering from.
- How can this defect by corrected?
The figure given below shows the magnetic field between two magnets:
- Copy the diagram and label the other poles of the magnets.
- Which is the weaker magnet?
Explain giving one example of each, the unisexual and the bisexual flowers.
What would happen to the number of grass plants and foxes if the number of rabbits:
- Increased?
- Decreased?
Give two examples each of organic acids and mineral acids.
‘The seed contains the future plant.’ Why is it said so?
A salt X when dissolved in distilled water gives a clear solution which turns red litmus blue. Explain the phenomenon.
The energy in petrol originally came from the sun. Explain how it got into petrol.