Identify the correct statements from the following: (i) [ Fe ( C 2 O 4 ) 3 ] 3 − is the most stable complex among [ Fe ( OH ) 6 ] 3 − , [ Fe ( C 2 O 4 ) 3 ] 3 − and [ Fe ( SCN ) 6 ] 3

Question

Identify the correct statements from the following:

(i) $[Fe (C_{2} O_{4})_{3}]^{3 -}$ is the most stable complex among $[Fe (OH)_{6}]^{3 -}, [Fe (C_{2} O_{4})_{3}]^{3 -}$ and $[Fe (SCN)_{6}]^{3 -}$
(ii) The stability of $[Co (NH_{3})_{6}]^{3 +}$ is greater than that of $[Co (en)_{3}]^{3 +}$
(iii) $Fe (CO)_{5}$ is a low spin complex.
(iv) $[Fe (NO_{2})_{3} Cl_{3}]^{3 -}$ exhibits linkage isomerism
(v) $NO_{2}^{-}$ and $SCN^{-}$ ligands are NOT ambidentate ligands
Choose the correct answer from the options given below :

TestHub · Accepted Answer

(i) Correct: oxalate is a bidentate chelating ligand, so [Fe(C₂O₄)₃]³⁻ is the most stable.

(ii) Wrong: [Co(en)₃]³⁺ is more stable than [Co(NH₃)₆]³⁺ (chelate effect).

(iii) Correct: CO is a strong field ligand, so Fe(CO)₅ is low spin with all electrons paired.

(iv) Correct: NO₂⁻ is ambidentate, so [Fe(NO₂)₃Cl₃]³⁻ shows linkage isomerism.

(v) Wrong: both NO₂⁻ and SCN⁻ are ambidentate ligands.

So (i), (iii) and (iv) are correct.

Answer (C).

Chemistry - Coordination Chemistry Question with Solution | TestHub

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