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.
Karthik said:
1 decade ago
Hydrogen sulphide-Hs+br->hbr+s.
So it become discolour.
So it become discolour.
Sanjay said:
1 decade ago
I think answer is "a' because it will form oxides with metals.
Dinesh said:
1 decade ago
Hydrogen sulphide can corrode metals such as iron, copper, brass. That discolour copper & brass utensils.
Anushadevi said:
1 decade ago
Because of the presence of hydrogen sulphide in Brass,it combines with oxygen in air and form water,evaporates.So remained sulphide is colourless in air .So Brass gets discoloured in the air.
Sahil Khare said:
1 decade ago
Hydrogen gas gives a smell of rotten eggs and turns lead acetate paper silvery back.
BHARAT 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.
Rajdeep said:
1 decade ago
Give chemical reaction.
Jeeva 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.
Hardik said:
1 decade ago
This process due to oxydation.
That's why I think answer is oxigen and oxigen must be present in process.
That's why I think answer is oxigen and oxigen must be present in process.
Paritosh said:
1 decade ago
What is hydrogen sulphide? why should we choose it ?
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