Brass gets discoloured in air because of the presence of which of the following gases in air (a)Oxygen(b)Carbon Dioxide(c)Hydrogen sulphide (d) Nitrogen

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

1.	Brass gets discoloured in air because of the presence of which of the following gases in air (a)Oxygen(b)Carbon Dioxide(c)Hydrogen sulphide (d) Nitrogen
Answer» (A) oxygenExplanation: Brass gets discoloured in AIR due to the presence of Oxygen. Brass constitute zinc and COPPER and these two ELEMENTS are transition elements. Among the given OPTIONS hydrogen sulphide is more ELECTRONEGATIVE. So when it react with brass, brass get discoloured