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 4 of 26.
Bikash Panigrahi said:
1 decade ago
It's due to the sulphide action.
(1)
Rajendra said:
1 decade ago
It is one of the nature.
(1)
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)
Shaik subhani said:
6 years ago
Brass is the alloy of Copper & Zinc.
Brass reacting with Hydrogen Sulphate present in the atmosphere it forms Zinc Sulphate.
Brass reacting with Hydrogen Sulphate present in the atmosphere it forms Zinc Sulphate.
(1)
Ayushi said:
3 years ago
Why can't (D) be the answer? Explain please.
(1)
Saloni kumari said:
11 months ago
I think option B is right.
(1)
GODFRED ADUSEI said:
4 months ago
I also think option B is the correct answer.
(1)
Paras said:
1 decade ago
Because it performs bleaching action probably.I'm not sure however!!
Yashwanth said:
1 decade ago
Why cant other can perform it?
Dhanpal singh said:
1 decade ago
Because of chemical reaction.
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