Chemistry -- Redox Reaction

2013-03-30 2:25 am

State and explain what would be observed in each of the following cases.Write an appropriate equation for each reaction.

i ) Adding sodium sulphite solution to aqueous bromine

ii ) Adding aqueous chlorine to potassium iodide solution

iii ) Adding iron(III) sulphate to potassium iodide solution

iv ) adding sodium sulphite solution to acidified permanganate solution

v ) Adding concentrated nitric acid to silver

vi ) Adding dilute nitric acid to zinc

vii ) Adding concentrated sulphuric acid to carbon

回答 (1)

用戶8129

2013-03-31 3:31 am

✔ 最佳答案

1.H2O(l)+SO32-(aq)+Br2(aq)->SO42-(aq)+2Br-(aq)+2H+(aq)
brown soln decolorize
2.Cl2(aq)+2Br-(aq)-->2Cl-(aq)+Br2(aq)
soln changes from yellowish green to brown
3.2Fe3+(aq)+2I-(aq)->2Fe2+(aq)+I2(aq)
soln changes from yellow to brown
4.6H+(aq)+5SO32-(aq)+2MnO4-(aq)->2Mn2+(aq)+3H2O(l)+5SO42-(aq)
purple soln decolorize
5.2H+(aq)+Ag(s)+NO3-(aq)->Ag+(aq)+NO2(g)+H2O(aq)
darker(more conc.) brown gas evolved
6.8H+(aq)+2NO3-(aq)+3Zn(s)->2NO(g)+4H2O(l)+3Zn2+(aq)
Further reaction:2NO(g)+O2(g)->2NO2(g)
pale brown gas evolved
7.H2SO4(l)+C(s)->CO2(g)+SO2(g)+H2O(l)
colorless gas given out

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