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Conversion of Fe2+ to Fe3+ and vice versaSPM 2008Paper 2 Q7Suggested Answer Fe3+ Fe2+ Fe2+ Fe3+ Reducing agent is zinc. Halogen is bromine. Add zinc to a solution containing Add bromine water to a solution Fe3+.containing Fe2+. Heat the mixture. Filter the mixture. Shake the mixture. Add sodium hydroxide solution. Add sodium hydroxide solution. A green precipitate is formed. Brown precipitate is formed.chem2u.blogspot.comConversion of Fe2+ to Fe3+ and vice versaSPM 2009Paper 2Suggested Answer A suitable metal is zinc The oxidation number of zinc increases from 0 to +2 Zinc undergoes oxidation. Zinc is a reducing agent The half-equation: Zn Zn2+ + 2e- The ion present in the green solution is iron(II) ion. The oxidation number of iron decreases from +3 to +2 Iron(III) ion undergoes reduction. Iron(III) ion is a reducing agent The half-equation: Fe3+ + e- Fe2+chem2u.blogspot.com
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