Question

1. 
Brass gets discoloured in air because of the presence of which of the following gases in air?

A. Oxygen
B. Hydrogen sulphide
C. Carbon dioxide
D. Nitrogen​

Answer 1

Answer:

Brass gets discolored in air because of the presence of Hydrogen sulphide. Reason :- 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.

Answer 2

B) Hydrogen sulphide

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