General Knowledge - General Science - Discussion

Because it is better rathering with hydrogen sulphide.

H2S is present in atmosphere?

Hydrogen sulphide is (sulphur and oh-) so it is base and there is ph value is more than 7 so it is react with brass presence of air and discoloured the brass so hydrogen sulphide is right answer.

Yes it is as hydrogen sulphide clears the chlorophyll from the sensitive plants and plants which are found in hilly regions.

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.

Its due to sulphide only.

Option is A because oxygen gas is present in air.

It is due to oxygen so the answer is A.

Option b is the answer because it removes the chlorophyll from plants.

When object is place between focus and optical center.