(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 copper vessel kept in moist air slowly acquires a greenish coating over its surface. What is this due to ?

When copper is placed in the atmosphere for sufficient time, a green crust is formed on its surface. The composition of the green crust is:

When copper is exposed to atmosphere for a longer time, a green mass deposits on its surface. Discuss the chemical reaction involved.

When a copper vessel is exposed to moist air for a long time, it acquires a dull green coating on its surface. The material of this green coating is a mixture of

When a copper vessel is exposed to moist air for a long time, it acquires a dull green coating on its surface. The material of this green coating is a mixture of:

When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation fo a layer of substance B. when an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity. (a) What is metal A? (b) What is metal C? (c) name the substance B. (d) name the substance D. (e) What type of chemcial can be used to remove the green layer from metal C and clean it? Why?

(a) Give reasonwhy copper is used to make hot water tanksbut steel (an alloy of iron) is not. (b). Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of