General Knowledge Quiz Contest -#13 Participate By Giving Answer

[dlance]

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:

1. A - Oxygen.
2. B - Hydrogen sulphide.
3. C - Carbon dioxide.
4. D _Nitrogen.

Give right Answer & Upvote this post to get Curation rewards from this post earnings+up vote from @dlance!