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:
A. zinc
B. magnesium
C. iron
D. copper
Answer:D
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:
A. zinc B. magnesium C. iron D. copper