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 16 of 26.
Lauren said:
9 years ago
All these comments only for one questions.
Jeron said:
9 years ago
No, it is option B because they are asking discoloured one.
Ashritha said:
9 years ago
As per my knowledge, it is option A.
Tushar kumar 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?
Sonia said:
9 years ago
It is because of chemical reaction.
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)
Nipun said:
9 years ago
According to me, the answer is option A.
Hina said:
9 years ago
Whats the optional element other than H2S?
Himanshu said:
9 years ago
How H2S effect it?
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