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For the given set of complexes : (P) [...

For the given set of complexes :
`(P) [Co(CN)_(6)]^(3-)" and "[Co(H_(2)O)_(6)]^(3+)`
`(Q) [Co(H_(2)O)_(6)]^(3+)" and "[Rh(H_(2)O)_(6)]^(3+)`
`(R ) [Co(H_(2)O)_(6)]^(3+)" and "[CoF_(6)]^(3-)`
`(S) [Co(NH_(3))_(6)]^(3+)" and "[CoF_(6)]^(3-)`
Select the correct order for `Delta_(0)`:

A

`[Co(CN)_(6)]^(3-)"gt "[Co(H_(2)O)_(6)]^(3+)`

B

`[Co(H_(2)O)_(6)]^(3+)"gt "[CoF_(6)]^(3-)`

C

`[Co(H_(2)O)_(6)]^(3+)"gt "[Rh(H_(2)O)_(6)]^(3+)`

D

`[Co(NH_(3))_(6)]^(3+)"gt "[CoF_(6)]^(3-)`

Text Solution

Verified by Experts

The correct Answer is:
A, BD
`Delta_(0)" of "Co^(3+) gt Co^(2+)` complexes
`Delta_(0)" of "CN^(-) gt NH_(3) gt H_(2)O gt F^(-)` complexes
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[Co(H_(2)O)_(6)]^(3+) complex is

Amongst [Co(o x)_(3)]^(3-),[CoF_(6)]^(3-) and [Co(NH_(3))_(6)]^(3+) :

Which complex of the following pairs has the larger value of Delta_(0) (i) [Co(CN)_(6)]^(3-) and [Co(NH_(3))_(6)]^(3+) (ii) [Co(NH_(3))_(6)]^(3+) and [CoF_(6)]^(3-) (iii) [Co(H_(2)O)_(6)]^(2+) and [Co(H_(2)O)_(6)]^(3+) .

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