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) Galvanised iron sheets have a coating of

2) Most soluble in water is

3) Which of the following is used for removing air bubbles from glass during its manufacture?

4) Washing soda is the common name for

5) Marsh gas is