Which ion has higher ∆o value in the given pair and
why?
[Co CN⁶]3-and [Ru NH3]3-
Answers
Answer:
The value of CFSE (Δ
o
) for complexes given below follow the order:
(I) [Co(NH
3
)
6
]
3+
(II) [Rh(NH
3
)
6
]
3+
(III) [Ir(NH
3
)
6
]
3+
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A
I < II < III
B
I > II > III
C
I < II > III
D
I=II=III
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Correct option is
A
I < II < III
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+
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