When metallic copper comes in contact with mositure, a green powdery/pasty coating can be seen over it. This is chemically known as

(a) name an alloy of copper. State its chemical composition and ay 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?

A metal gets coated with a green basic carbonate when exposed to moist air. The metal is -

If you collect silver coins and copper coins, after some days a black coating on silver coins and a green coating on copper coins appear. Which chemical phenomenon is responsible for these coatings? Write the chemical name of these black and green coatings.

A student has been collecting silver coins and copper coins. One day she observed a black coating on silver coins and a green coating on copper coins. Which chemical phenomenon is responsible for these coatings ? Write the chemical names of black and green coatings ?

A student has been collecting silver coins and copper coins. One day he observed a black coating on silver coins and a green coating on copper coins. Which chemial phenomenon is responsible for these coatings. Write the chemical name of black and green coatings.