Amongst the following, the lowest degree of paramgnetism per mole of the compound at `298 K` will be shown by

Options

A. `MnSO_(4).4H_(2)O`
B. `NISO_(4).6H_(2)O`
C. `FeSO_(4).6H_(2)O`
D. `CuSO_(4).5H_(2)O`

Answer

D

Explanation

In `MnSO_(4).4H_(2)O,Mn` is present as `MN^(2+).(3d^(5)),n=5`
In `CuSO_(4).5H_(2)O,Cu` is present as
`CU^(2+).(3d^(9)),n=1`
In `FeSO_(4).6H_(2)O,Fe` is present as
`Fe^(2+)(3d^(6)),n=4`
In `Ni(SO_(4).6H_(2)O,Ni` is present as
`Ni^(2+).(3d^(8)),n=2`
paramagetic character `prop` unpaired electrons.