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 24 of 26.
Sushma said:
1 decade ago
I think B is the correct option Since the brass is an alloy of transition elements Zn and Cu,it reacts with hydrogen sulphide to get discolored
Dev said:
1 decade ago
The Cu present in brass reacts with the sulphide ion of H2S forming CuS (cupric sulphide) which is black colored. Thus when brass is exposed to air it gets discolored.
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.
Yashasvi said:
1 decade ago
Hydro sulphide is a colourless gas and if mixed with others, will get colourless.
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.
Balwinder said:
1 decade ago
Any metal gets discolor due to its oxidation. Brass gets discolored in air due to the presence of Oxygen.
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.
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.
Shivani said:
1 decade ago
Becuse it is a chemical reaction so it discolored the color of the brass.
Hina said:
1 decade ago
Option b is correct.
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