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 1 of 26.
AliMaaz said:
4 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)
Gopal said:
3 years ago
Yes, B is right. I agree.
(25)
Chilu said:
3 years ago
Thanks all for discussing it in detail for good understanding.
(22)
Anomie said:
4 years ago
Brass does not react with oxygen, nitrogen and carbon dioxide. Because of the presence of Hydrogen sulphide, Brass is discolored in sunlight. Therefore, the answer is B.
(17)
Abhi said:
3 years ago
B is the correct answer.
(17)
Theja. said:
4 years ago
Thanks all for giving the explanation of the answers.
(16)
Rohini said:
2 years ago
This is because the presence of a mixture of hydrogen and sulphide and brass, which has a very light colour and mixture with hydrogen sulphide leads to non-temperature (hot and cold temperature type). So it becomes discoloured. Hence, brass gets discoloured in the air because of the presence of hydrogen sulphide.
(16)
Bhavika jangid said:
3 years ago
I'm not getting How option B is correct.
Please explain to me.
Please explain to me.
(15)
Mudasir said:
2 years ago
Brass gets discolored due to H2S present in the air.
Brass is made of zinc and copper and copper sulfite and zinc sulfide are colored.
Brass reacts with Oxygen and causes corrosion. But corrosion takes years to discolor.
Brass is made of zinc and copper and copper sulfite and zinc sulfide are colored.
Brass reacts with Oxygen and causes corrosion. But corrosion takes years to discolor.
(15)
Ananya Kumari said:
1 year ago
Brass gets discoloured in the air primarily due to the presence of hydrogen sulfide (H₂S).
When hydrogen sulfide reacts with the copper in brass, it forms copper sulfide, which appears as a dark tarnish or discolouration on the surface of the brass.
When hydrogen sulfide reacts with the copper in brass, it forms copper sulfide, which appears as a dark tarnish or discolouration on the surface of the brass.
(15)
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