Question

In which of the complex CFSE is maximum? (Consider Dq same in all
complexes)
[Fe(NH3)6]+3
[CO(CN)61-3
[Ni(H20)6]+2
[Fe(CN)61-3​

Answer 1

Answer:

For the given complexes, the oxidation states of the central metal ions is same.

The ligands are also same. But the effective nuclear charge of the metal ions is different.

Higher is the value of the Z

eff

, higher will be the value of CFSE (

o

) for complexes .

The Z

eff

value for the central metal ion in the complexes increases in the order

[Co(NH

3

)

6

]

3+

<[Rh(NH

3

)

6

]

3+

<[Ir(NH

3

)

6

]

3+

.

The value of CFSE (

o

) for complexes follow the order I<II<III or

[Co(NH

3

)

6

]

3+

<[Rh(NH

3

)

6

]

3+

<[Ir(NH

3

)

6

]

3+

Explanation:

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