why did copper plate become dull green after a couple of months
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because it has been reacted with the atmospheric water and oxygen and formed cupper oxide at the top layer
so it becomes dull green in colour
you can remove it easy by applying colgate to it or any small acid to it.
:)
rishabh7346:
colgate base hota hai
yes
but cupper oxide is a acid
very less powerful acid
oo
so it can be removed by a base or a acid more powerful
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