45.An iron nail is heated with concentrated sulphuric acid. Which of the following combinations is correct?
Gas given off Colour of solution formed
A.hydrogenpale green
B.hydrogenyellow
C.sulphur dioxidepale green
D.sulphur dioxideyellow
IRON+SULPHURIC ACID 唔係出HYDROGEN咩?
CE Question
2008-06-16 12:22 am
回答 (3)
2008-06-16 12:53 am
✔ 最佳答案
The answer is D.
When iron reacts with a non-oxidizing acid, hydrogen is formed.
Fe + 2H+ → Fe2+ + H2
However, hot concentrated sulphuric acid is an oxidizing agent. Therefore, iron would be oxidized to Fe3+ ions (a yellow solution), and sulphuric acid is reduced to sulphur dioxide (a colourless gas with a choking smell).
2Fe + 6H2SO4 → Fe2(SO4)3 + 6H2O + 3SO2
=
2008-06-16 12:48 am
如果係dilute sulphuric acid,就係出hydrogen.
但係如果係conc. sulphuric acid 就係出SO2
所以答案係D.
但係如果係conc. sulphuric acid 就係出SO2
所以答案係D.
參考: by myself
2008-06-16 12:46 am
must be C/D
I think is D.sulphur dioxideyellow
IRON+SULPHURIC ACID 係出HYDROGEN
but react with concentrated sulphuric acid 係出sulphur dioxide
I think is D.sulphur dioxideyellow
IRON+SULPHURIC ACID 係出HYDROGEN
but react with concentrated sulphuric acid 係出sulphur dioxide
收錄日期: 2021-04-23 23:05:07
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080615000051KK01637