Question

(a) Name an alloy of copper. State its chemical composition and any one use.
(b) 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 1

Answer:

A.

State its chemical composition and any one use. Answer : An alloy of copper is brass It contains Copper (Cu) - 80% and Zinc (Zn) - 20%. It is used for making cooking utensils.

Explanation:

B.

When copper vessel is exposed to moist air for a long time it develops a green layer on its surface. Copper corrodes by oxidation in which it reacts with oxygen in the air to form copper oxide. ... This process is called corrosion of copper.