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

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

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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 

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