Brass gets discoloured in air because of the presence of which of the following

Brass gets discoloured in air because of the presence of which of the following gases in air?

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1) Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?

2) Which of the gas is not known as green house gas?

3) Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?

4) Wood is the main raw material for the manufacture of

5) The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is