General Knowledge - General Science - Discussion

The normal brown coloration on brass which slowly forms is primarily due to the oxidation of the copper (which makes up about 70% or more of the Brass alloy) to copper oxide. The greenish patina that forms on brass (especially in inclement environments) can be a complex of copper carbonates and acetates (acetates come from naturally or artificially occurring contaminants or droppings in the atmosphere depending on the presence of Industry).

Vinegar (acetic acid) is capable of producing an intense green corrosion on brass (copper acetate) and copper alloys generally. Regions near industry may be exposed to Sulfur compounds such as Sulfur Dioxide, or Hydrogen Sulfide. Both of these are potent copper oxidizers, hence the use of 'Liver of Sulfur' by artisans to oxidize copper, bronze, and brass castings.

Additionally Hydrogen Sulfide as well as liquid poly-sulfide concentrates are a potent oxidizer for Silver alloys as well. For this reason, do not keep your brass and silverware in a cabinet that also contains matches!

Why answer is B option?

We can not choose because it can do it.

So can you do something which you can't do it.

Because brass is react with sulphide then it will corroded.

Actually, Brass is not a simple metal but an alloy i.e. a mixture of Cu and Zn. Generally sulphur in air is very reactive to copper mixtures. So the answer is B.

Because hydrogen sulphide is an acid. Hence being corrosive.

Why we choose hyroden sulphide? I can't understand. Please anybody help me.

What is its equation?

Brass is a compound of cu and zn.

Different substance have different reactivity, so hydrogen sulphide is it's corroded form. Maybe.