Question

sometimes copper turns into black when exposed to air due to the formation of which compound?​

Answer 1

Answer:

Copper forms a rich variety of compounds with oxidation states +1 and +2, which are often called cuprous and cupric, respectively. It does not react with water but reacts slowly with atmospheric oxygen, forming a layer of brown-black copper oxide.

Answer 2

Answer:

Of course

I would love to be your friend

You can call me kiwi

I can't tell anyone my name

Your intro??