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 3 of 26.
Ruhi Khan said:
1 decade ago
Actually transition elements are colored elements. Here Zn & Cu are the transition elements ,these composition is the brass. But it gets discolored in air because of presence of Hydrogen sulphide in the air.It discolored the color of the brass. So it appears as discolored.
Nepal ranjan said:
1 decade ago
Primary ingredients of brass are cu& zn. When brass exposed in the air then H2S reacts. Cu reacts with Sulphide forms cu2s which is colored black and zn reacts with hydrogen forms zinc hydroxide which color is faint red. That's why it gets discolored exposed in air.
Ananya Kumari said:
6 months 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.
(4)
Sonali said:
1 decade ago
I think that answer B is correct because brass is equal to Zn and Cu which is transition element. We know that such types of elements are color elements. But when brass reacts with hydrogen sulphide it becomes discolored due to the presence of air.
Lingaswamy said:
1 decade ago
According to my knowledge when sulphuric reacts with brass that surface will eats away with that when light falls on that light oriented in different direction so that we can't get any color appear there thats we may get black color.
My think so.
My think so.
MD.Imran said:
1 decade ago
It is because the presence of mixture of hydrogen and sulphide and 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.this is better answer.etc
Ayush said:
5 years ago
Brass gets discolored in the air because of the presence of Hydrogen sulphide. Because the presence of a mixture of hydrogen and sulphide and brass is a mixture of copper and zinc, which has a color very light that's why it happens.
Sai mahesh said:
10 years ago
Actually hydrogen sulfide is a oxidizing agent so when the bras is oxidize with hydrogen sulfide its convert to brass oxide.
Like iron is reacts with oxides then its changes iron color. Like that brass converts into colorless.
Like iron is reacts with oxides then its changes iron color. Like that brass converts into colorless.
ANTRIKSH said:
1 decade ago
I think brass is the combination of copper also and it is reacts sulphor fast other than all these also zinc present in brass reacts with hydrogen but no any mixer reacts directly with the air whenever moisture is not present.
AVSK RAJPUT said:
8 years ago
It can never possible, with hydrogen sulphide. If brass gets rusted then, first of all, it must be break down into hydrogen and sulphur, but oxygen can be found in free with maximum no of molecules hence answer should be A".
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