1.

The pair in which both species have same magnetic moment (spin only value ) is :

Answer»

`[Cr(H_(2)O)_(6)]^(2+), [CoCl_(4)]^(2-)`
`[Cr(H_(2)O)_(6)]^(2+), [Fe(H_(2)O)_(6)]^(2+)`
`[Mn(H_(2)O)_(6)]^(2+), [Cr(H_(2)O)_(6)]^(2+)`
`[CoCl_(4)]^(2-),[Fe(H_(2)O)_(6)]^(2+)`

Solution :`(b) [Cr(H_(2)O)_(6)]^(2+) IMPLIES d^(4),[FeH_(2)O)_(6)]^(2+) implies d^(6).` Both have 4 UNPAIRED ELECTRONS.


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