Hello Friends,
Test your General Knowledge Level by giving Correct answer in comment.
Question:
" Brass gets discoloured in air because of the presence of which of the following gases in air?"
Options:
- A - Oxygen.
- B - Hydrogen sulphide.
- C - Carbon dioxide.
- D _Nitrogen.
Give right Answer & Upvote this post to get Curation rewards from this post earnings+up vote from 
!
