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 7 of 26.
Sachin said:
9 years ago
Which of the following gases in air units with many metals?
(A) Hydrogen
(B) Oxygen
(C) Helium
(D) Carbon dioxide
Please tell me the answer.
(A) Hydrogen
(B) Oxygen
(C) Helium
(D) Carbon dioxide
Please tell me the answer.
Rohit said:
5 years ago
Brass is a type of thing which has a color very light and mixture is non temperature (hot and cold type of temperature) so it gets discolored.
Gauri said:
1 decade ago
As brass is an alloy of copper and zinc, the copper when kept free to air reacts with hydrogen sulphide and so the alloy is discoloured.
Parikshit said:
9 years ago
I do think so the correct option is A. It can't be B at all. Just pay attention that iron gets rust due to moisture mostly from oxygen.
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)
Srinivas jntv said:
1 decade ago
Transition elements are coloured. The brass is combination of zn and cu. But it is discoloured due to hydrogen sulphide in air.
Viswanadh said:
6 years ago
Brass is a type of alloy which is made with Cu and Zn. H2S gas react with Cu will give CuS precipitate which is yellow colour.
Valerie said:
9 years ago
I actually think its A because oxygen usually causes things to rust l8k at the places with a lot of oxygen in the atmosphere.
Anu said:
1 decade ago
Yes it is as hydrogen sulphide clears the chlorophyll from the sensitive plants and plants which are found in hilly regions.
AliMaaz said:
3 years ago
The composition of Oxygen (O2) in the air is 21%.
Brass does not react with oxygen and thus decolourization does not occur.
Brass does not react with oxygen and thus decolourization does not occur.
(34)
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