General Knowledge - General Science - Discussion

Safe corrosion will look reddish, black to brown or green to blue. Safe corrosion will occur if the brass has been kept clean and dry. If it is brownish or black this will be due to oxidization of the copper which occurs when exposed to air; this a natural phenomenon and is non-destructive. This is usually called "tarnish" and can be removed by careful cleaning and polishing. If the corrosion is green, continuous and non-flaky this again is safe corrosion.

Hydrogen sulphide is answer it reacts with metal.

Hydrogen sulphate is correct answer.

I think the acidity of Hydrogen Sulphide is more than the oxygen. Because of that Brass can be easily discolored.

Hydrogen sulphide is having better bleaching ability.

Is the Hydrogen Sulphide more corrosive in nature?

According to my knowledge when sulphuric reacts with brass that surface will eats away with that when light falls on that light oriented in different direction so that we can't get any color appear there thats we may get black color.

My think so.

Answer B is correct because brass is a material (Cu+Zn=brass) H2SO4 is acid so the brass is discoloured.

I think it must be a certain new type of reaction.

Ya option B is correct due to brass chemical compound and physical behaviour.