1.

The d-orbitals participating in hybridisation of metal atom may be from the n & (n-1) shell. This depends on the nature of metal and nature of ligand. The complexes involving the inner d-level (inner orbital complexes) results when the ligand is a powerful (or) strong ligand results in a diamagnetic (or) low spin complexes. A weak ligand usually results in the formation of outer orbital complex (or) high spin complex. Among the following sets, the one having the same geometry and same magnetic property for both complexes is

Answer»

`[Mn(CN)_(6)]^(3-)&[MnF_(e)]^(3-)`
`[CO(CN)_(6)]^(3-)&[CoF_(6)]^(3-)`
`[Fe(CN)_(6)]^(4-)&[Fe(H_(2)O)_(6)]^(2+)`
`[CR(CN)_(6)]^(3-)&[Cr(NH_(3))_(6)]`

Solution :`[Cr(CN)_(6)]^(3-),d^(2)sp^(3)` OCTAHEDRAL.
`[Cr(NH_(3))_(6)]:d^(2)sp^(3)` octabedral.
`:.` Both `CN^(-)` and `NH_(3)` are strong field ligands.


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