X is an aqueous solution. When X is added in excess to bromine water, the resulting solution is colourless. When X is treated with dilute hydrochloric acid, a gas with an irritating smell evolves. X may be
A. sodium sulphite solution
B. sodium hypochlorite solution
C. ammonium hydrogencarbonate solution
D. ammonium nitrate solution
Please explain your answer, thanks.
What is X?
2009-03-27 6:59 pm
回答 (1)
2009-03-27 7:22 pm
✔ 最佳答案
Since X decolourizes bromine water, it should contain a reducing agent. Therefore answer should be A since sulphite (aqueous form of SO2) is a reducing agent.Moreover, when sulphite salt is added to an acid, SO2 will be given our.
2009-03-27 11:23:47 補充：
For B, hypochlorite is an oxidizing agent.
For C, bicarbonate is not an oxidizing nor reducing agent.
For D, ammonium salt has no gas evolved when mixed with acid.
參考: Myself
收錄日期: 2021-04-18 14:12:44
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