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 23 of 26.
Raghava said:
4 years ago
Brass does not react with oxygen, nitrogen and carbon dioxide. . Hence, brass gets discolored in air because of the presence of hydrogen sulphide.
Piyush said:
4 years ago
Why hydrogen sulphide? Please explain.
Piyush said:
4 years ago
Why hydrogen sulphide? Please explain.
BHARATH.MP said:
4 years ago
Because of chemical reactions.
Janani said:
3 years ago
Why hydrogen sulphide? Explain please.
Pavan said:
3 years ago
Explain the answer.
Pranjal Tripathi said:
3 years ago
Brass is a copper alloy with the addition of zinc.
Copper is reactive with some materials in the atmosphere at different temperatures.
Exposure to air at normal temperatures results in discolouration (tarnish) due to reaction with sulfur and chlorine compounds and carbonates,
Exposure at high temperatures > 150°C. Results in reaction with oxygen-producing red oxides (cuprous) at lower temperatures and brown or black oxides (cupric) at higher temperatures.
Copper is reactive with some materials in the atmosphere at different temperatures.
Exposure to air at normal temperatures results in discolouration (tarnish) due to reaction with sulfur and chlorine compounds and carbonates,
Exposure at high temperatures > 150°C. Results in reaction with oxygen-producing red oxides (cuprous) at lower temperatures and brown or black oxides (cupric) at higher temperatures.
(3)
Ayushi said:
3 years ago
Why can't (D) be the answer? Explain please.
(1)
Anshika said:
3 years ago
B is correct because brass gets discoloured in the air because of the presence of hydrogen sulphide.
(5)
Anshika Sharma said:
3 years ago
I think option B is right.
(2)
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