1.

Atomic number of Mn, Fe and Co and 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic ?

Answer»

`[Co(NH_(3))_(6)]^(3+)`
`[Mn(CN)_(6)]^(3-)`
`[FE(CN)_(6)]^(4-)`
`[Fe(CN)_(6)]^(3-)`

Solution :In (a), `Co^(3+)=3d^(6)=d^(2)d^(1)d^(1)d^(1)d^(1)`. In presence of `NH_(3)`, it becomes `d^(2)d^(2)d^(2)d^(0)d^(0)`
In (b), `Mn^(2+)=3d^(5)=d^(1)d^(1)d^(1)d^(1)d^(1)`. In presence of `CN^(-)`, it is `d^(2)d^(2)d^(1)d^(0)d^(0)`
In (C ), `Fe^(2+)=3d^(6)`. Similar to (a)
In (d), `Fe^(3+)=3d^(5)`. Similar to (b).


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