Chemical Sciences Coordination Compounds

Identify the complex ions in sequential order when ferroin is used as an indicator in the titration of iron(II) with potassium dichromate. (phen = 1,10 - phenathroline)

1
[Fe(phen)3]2+ and [Fe(phen)3]3+
2
[Fe(phen)3]3+ and [Fe(phen)3]2+
3
[Fe(phen)3]4- and [Fe(phen)3]3-
4
[Fe(phen)3]3- and [Fe(phen)3]4-

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