General Knowledge - General Science - Discussion
Discussion Forum : General Science - Elements and Metals (Q.No. 1)
1.
Brass gets discoloured in air because of the presence of which of the following gases in air?
Discussion:
254 comments Page 10 of 26.
K.Manvithasai said:
9 years ago
The correct option is A.
Manvitha sai said:
9 years ago
I think the correct answer is hydrogen.
Himanshu said:
9 years ago
This is not a fact @Aditee.
Aditee agrawal said:
9 years ago
I think because other gases are inert. So, the correct answer is b.
Himanshu said:
9 years ago
How H2S effect it?
Hina said:
9 years ago
Whats the optional element other than H2S?
Nipun said:
9 years ago
According to me, the answer is option A.
Ankur said:
9 years ago
This is called Tarnishing. It is a thin layer of corrosion that forms over copper, brass, silver, aluminium, magnesium and other similar metals as their outermost layer undergoes a chemical reaction. Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish, although it may tarnish with oxygen over time. It often appears as a dull, grey or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike rust. Only the top few layers of the metal react, and the layer of tarnish seals and protects the underlying layers from reacting the tarnishing.
(1)
Sonia said:
9 years ago
It is because of chemical reaction.
Saurabh said:
9 years ago
Why we found a milky colour sample of C.G.C KOD'S drain?
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