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Consider the following two complex ions ...

Consider the following two complex ions : `[COF_(6)]^(3-)` and `[Co(C_(2)O_(4))_(3)]^(3-)`. Which of the following statements (s) is/are false ?
I. Both are octahedral.
II. `[CO(C_(2)O_(4))_(3)]^(3-)` is diamagnetic while `[CoF_(6)]^(3-)` is paramagnetic.
III. Both are outer orbital complexes.
IV. In both the complexes, the central metal is in the same oxidation state.

A

Both (II) and (III)

B

(II), (III) and (IV)

C

Only (III)

D

Both (III) and (IV)

Text Solution

Verified by Experts

The correct Answer is:
C
All statements are true except (III), that both are outer orbital complexes. In fact,
In both the given complexes, the central metal is in the same oxidation state, i.e. + 3
`[CoF_(6)]^(3-)` due to weak ligand (F) does nott go for pairing and show outer octahedral orbital complex `(sp^(3)d^(2))`. As it has five unpaired electrons, therefore, it is paramagnetic in nature.
While `[Co(C_(2)O_(4))_(3)]^(3-)` due to strong biodentate ligand, go for pairing and forms inner octahedral orbital complex `(d^(2)sp^(3))`. As it does not have unpaired electrons, therefore it is diamagnetic in nature.
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