A) \[{{[Fe{{({{H}_{2}}O)}_{6}}]}^{3+}}\]
B) \[{{[Fe{{(N{{H}_{3}})}_{6}}]}^{3+}}\]
C) \[{{[Fe{{({{C}_{2}}{{O}_{4}})}_{3}}]}^{3-}}\]
D) \[{{[FeC{{l}_{6}}]}^{3-}}\]
Correct Answer: C
Solution :
In each of the given complex, Fe is in +3 state. As \[{{C}_{2}}O_{4}^{2-}\]is didentate chelating ligand, if forms chelate rings and hence is the most stable complex.
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