Brass gets discoloured in air because of the presence of which of the following gases in air?
(A) Oxygen
(B) Hydrogen Sulphide
(C) Carbon Dioxide
(D) Nitrogen
Answer: (B) Hydrogen sulphide
(A) Oxygen
(B) Hydrogen Sulphide
(C) Carbon Dioxide
(D) Nitrogen
Answer: (B) Hydrogen sulphide