General Knowledge - General Science - Discussion

Right, Thanks everyone for explaining.

Brass does not react with oxygen, nitrogen and carbon dioxide. Because of the presence of Hydrogen sulphide, Brass is discolored in sunlight. Therefore, the answer is B.

The Answer is option : A.

Agree, option B is right.

I think option B is right.

B is correct because brass gets discoloured in the air because of the presence of hydrogen sulphide.

Why can't (D) be the answer? Explain please.

Brass is a copper alloy with the addition of zinc.

Copper is reactive with some materials in the atmosphere at different temperatures.

Exposure to air at normal temperatures results in discolouration (tarnish) due to reaction with sulfur and chlorine compounds and carbonates,

Exposure at high temperatures > 150°C. Results in reaction with oxygen-producing red oxides (cuprous) at lower temperatures and brown or black oxides (cupric) at higher temperatures.

Explain the answer.

Why hydrogen sulphide? Explain please.