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:
252 comments Page 2 of 26.
Anjali mishra said:
2 years ago
Option B is the correct answer.
(12)
Priya said:
2 years ago
B is the correct answer.
(11)
Vishesh said:
1 year ago
According to me, option B is incorrect because they have asked for gas.
(11)
Shristy said:
1 year ago
Thanks all for explaining explaining the answer.
(9)
Anshika said:
3 years ago
B is correct because brass gets discoloured in the air because of the presence of hydrogen sulphide.
(5)
Swathi said:
1 year ago
Yes, Agree option B is the correct answer.
(5)
Anbarasan said:
7 months ago
How? Please explain.
(5)
Maggy said:
4 months ago
Agree, Option B is the correct answer.
(5)
Ashish deepanakar said:
2 years ago
Right, Thanks everyone for explaining.
(4)
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)
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