1.

Which has maximum paramagnetic nature ?

Answer»

`[Cu(H_(2)O)_(4)]^(2+)`
`[Cu(NH_(3))_(4)]^(2+)`
`[Mn(H_(2)O)_(6)]^(2+)`
`[Fe(CN)_(6)]^(4-)`

Solution :(i) `[Cu(H_(2)O)_(4)]^(+2)Cu^(+2)= 3D^(9)`No. of unpaired
`e^(-)=1`
(ii) `[Cu(NH_(3))_(4)]^(+2) Cu^(+2)=3d^(9)`

No. of unpaired ELECTRON =1
(iii) `Mn^(+2)=3d^(5) 4s^(0)` No. of unpaired `e^(-)=5`
(iv) `Fe^(+2)= 3d^(6)`

No. of unpaired electron =0


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