Why Brass gets discoloured in air because of the presence of which gas

1.	Why Brass gets discoloured in air because of the presence of which gases in air?
Answer» Why Brass gets DISCOLORED in air because of the presence of which gases in air? Choose the CORRECT option from below list (1)HYDROGEN sulphide (2)Oxygen (3)Nitrogen (4)Carbon dioxide Answer (1) Hydrogen sulphide

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