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9.31     Amongst the following, the most stable complex is

                 (i)[Fe(H_{2}O_{6})]^{3+}        (ii)[Fe(NH_{3})_{6}]^{3+}           (iii)[Fe(C_{2}O_{4})_{3}]^{3-}          (iv)[FeCl_{6}]^{3-}        
 

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We know that due to the chelation effect stability of the chelating compound is more than the simple compound.  Thus it is easy to notice that   [Fe(C_{2}O_{4})_{3}]^{3-} is most stable among all given compounds.

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Devendra Khairwa

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