Question

When a copper object is exposed to moist air for a long time, then a green coating is formed on its surface. (a) what is the material of the green coating? (b) state weather the green coating is acidic or basic

Answer 1

a) The material of green colour is known as copper carbonate.
b) The nature of the material formed will be basic.
I guess its also amphoteric in nature.
Hope this helps you.

Answer 2

(a) The material of the green coating is known as copper carbonate.
(b) the nature of the material formed will be basic I guessed it is also a metallic in nature.

I hope this help you