A vessel is exposed to moist air for a long time. It acquires a light, green coating. What is the vessel made of?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Copper.
When a copper vessel is exposed to moist air for a long time, a green layer develops on its surface.
Copper metal turns green due to corrosion when exposed to air.
When a copper vessel is exposed to air during the rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide.
This gives green color to the surface of copper metal.