Question

Arrange the complexes in order of decreasing stability. Rank from most stable to least stable. To rank items as equivalent, overlap them. [Ni(en)(H2O)4] [FeF6] [Fe(NH3)6] [Ni(en)3])

Answer 1

Answer: [Ni(en)3] > [Ni(en)(H2O)4] > [Fe(NH3)6] > [FeF6]

Explanation:

Generally chelating ligands stabilize the complex more than non chelated ligands and more the no of chelated ligands more the stability.

Here en (ethylenediamine) is a chelated ligand and stabilze the complex more by chelation.

And Strong field ligand (NH3) also stabilze the complex more than weak field ligand (F).

Hence F containing complex is least stable.

Answer 2

The rank of the coordination compounds in the increasing order of the stability is $\rm [Ni(en)_3] > [Ni(en)(H_2O)_4] > [Fe(NH_3)_6] > [FeF_6]$.

What are coordination compounds?

The coordination compound are the complexes in which the central metal atom has been bounded by the nonmetal to the complexes through the chemical bond.

The stability of the coordination complexes is attributed to the number of chelating agents to the central atoms.

The increased number of atoms to the central atoms adds to the stability of the complex. Thus, the increasing order of the stability is $\rm [Ni(en)_3] > [Ni(en)(H_2O)_4] > [Fe(NH_3)_6] > [FeF_6]$.

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