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Question

Among the following the most stable complex is

A
[Fe(H2O)6]3+
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B
[Fe(CN)6]3
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C
[Fe(C2O4)3]3
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D
[FeCl6]3
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Solution

The correct option is C [Fe(C2O4)3]3
In the ideas on chelation, we just saw that if a compound has chelation it is going to be a lot more stable. Among the options, all the other ions are monodentate barring [Fe(C2O4)3]3. The oxalate anion will form a chelate with iron and hence would be more stable. Simple idea isn't it?

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