When a vessel is exposed to moist air for a long time, then a green coating is formed on its surface. The vessel must be made of:- zinc
- magnesium
- iron
- copper
Correct Answer: D. copper
Explanation: Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide. Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.
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