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 5 of 26.
Ankush thakur said:
1 decade ago
Presence of air and water in atmosphere.
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.
Hina said:
1 decade ago
Option b is correct.
Shivani said:
1 decade ago
Becuse it is a chemical reaction so it discolored the color of the brass.
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.
Tsering said:
1 decade ago
As we know that zinc and copper is substituent of the brass so they get reacted with hydrogen sulphide. Also compare to other hydrogen sulphide is more electronegative.
Balwinder said:
1 decade ago
Any metal gets discolor due to its oxidation. Brass gets discolored in air due to the presence of Oxygen.
Pawani kumari said:
1 decade ago
Brass constitute zinc and copper and these two elements are transition elements. Among the given options hydrogen sulphide is more electronegative. So when it react with brass, brass get discolored.
Yashasvi said:
1 decade ago
Hydro sulphide is a colourless gas and if mixed with others, will get colourless.
ANAND SHARMA said:
1 decade ago
Actually brass constitutes of Cu+Zn, as it comes in contact of Hydrogen Sulphide, it transform into copper sluphate of blue color & zinc hydooxide of faint red color. Hence, it changes color.
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