1.

The bivalent metal ion having maximum paramagnetic behaviour among the first transition series elements is

Answer»

`Mn^(2+)`
`CU^(2+)`
`Sc^(2+)`
`Cu^(2+)`

Solution :`Mn^(2+) (3d^5 4s^0) to 5 ` unpaired electrons.
`Cu^(2+) (3d^9 4s^0) to 1 ` unpaired electron
`Sc^(2+) (3d^1 4s^0) to 1 `unpaired electron
`Cu^+ (3d^(10) 4s^0 ) to 0 ` unpaired electron
HENCE , `Mn^(2+)` has MAXIMUM NUMBER of unpaired THUS, it shows maximum paramagnetic behaviour


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