1.

Dinitrogen (N_(2)) and dioxygen (O_(2)) are the main constituents of air but they do not react with each other to form oxides of nitrogen because

Answer»

the REACTION requires initiation by a catalyst
oxides of nitrogen are unstable
the REACTIONIS endothermic and requires very high temperature
the stoichiometry of `N_(2)` and `O_(2)` in air is not ideal for the reaction to take place

Solution :Copper metals when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season , the metals reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide . This gives a green colour to the surface of copper METAL.
The reaction is as follows :
`2Cu + H_(2)O + CO_(2) + O_(2) to Cu (OH)_(2) + CuCO_(3)`


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