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 6 of 26.
Yochana said:
1 decade ago
How can you say that H2S is present in the atmosphere?
Jyothi said:
1 decade ago
Becuase of oxidation any metal is discoloured in the process of oxidation.
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.
Gauri said:
1 decade ago
As brass is an alloy of copper and zinc, the copper when kept free to air reacts with hydrogen sulphide and so the alloy is discoloured.
Shashikant said:
1 decade ago
As brass is metal made up from copper and zink it gets rusted from h2s present in air.
Swayamprava dikshit said:
1 decade ago
brass is an alloy of zn & cu. in present of atmosprere it reacts as
zn+cu+h2s=cu2s+znh.
cu2s coloured the alloy black & znh brings colours of faint red.
zn+cu+h2s=cu2s+znh.
cu2s coloured the alloy black & znh brings colours of faint red.
Purvi said:
1 decade ago
Its a hydrogen sulphide which discolours the brass which is a composition of cu and zn.
Ashish mishra m.pharm said:
1 decade ago
Because in the present of hydrogen sulphite in air cause oxidation reaction hence colour is change.
Shrinu said:
1 decade ago
It is B presence of hydrogen sulphide in air and reacts oxidation then colour changes.
Dipali dhakoliya said:
1 decade ago
In brass the aluminium is present which is less reactive then hydrogen sulfide and it lose the colour.
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