General Knowledge - General Science - Discussion

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.

I think option B is right.

Agree, option B is right.

The Answer is option : A.

Why we choose hydrogen sulphide?

I think right ans is option A.

It is because the presence of mixture of hydrogen and sulphide and brass is a type of thing which has a color very light and mixture is non temperature (hot and cold type of temperature) so it gets discolored.

I think it is nature of atmosphere.

It is react with the atomsphere air,then it become colourless due to the effect of sulphide.

It's due to the sulphide action.