Question

plz answer me fast

Brass gets discoloured in air becoz of the presence of which of the following gases in air?
a)Oxygen
b)hydrogen sulphide
c)carbon dioxide
d)nitrogen

Answer 1

brass gets discoloured in air because of the presence of gas hydrogen sulphide because hydrogen sulphide is corrosive to some metals under some conditions (temperature or moisture).

if it seems to be helpful mark my answer as brainliest

Answer 2

hii,
the answers is b)hydrogen sulphide becoz of corrosion 
it means deterioration of a material due to interaction with its environment.
it also causes rusting of iron.

hope the answer will help u
thnx