1.

What is the likely configuration of the cobalt d-electrons for the speciesCoCl_(6)^(3-) and Co(NO_(2))_(6)^(3-)?

Answer»

`CoCl_(6)^(3-)` : low spin , `Co(NO_(2))_(6)^(3-)` , low spin
`CoCl_(6)^(3-)` , HIGH spin ,` Co(NO_(2))_(6)^(3-)` : low spin
`CoCl_(6)^(3-)` : low spin , `Co(NO_(2))_(6)^(3-)` : high spin
`CoCl_(6)^(3-)` : high spin `,Co(NO_(2))_(6)^(3-)`: high spin

Solution :Weak field ligands (LIKE `Cl^(-)`) giving low value of `Delta_(0)` formhigh spin OCTAHEDRAL complexes whereas strongfield ligands (like `NO_(2)^(-)`) give rise to low spin (spin paired) complexs.


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