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The pair which both the species have the...

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

A

`[Cr(H_(2)O)_(6)]^(2+)[ CoCI_(4)]^(2-)`

B

`[Cr(H_(2)O)_(6)]^(2+)[ Fe(H_(2)O)_(6)]^(2-)`

C

`[Mn(H_(2)O)_(6)]^(2+)[Cr(H_(2)O)_(6)]^(2-)`

D

`[CoCI_(4)]^(2-),[Fe(H_(2)O)_(6)]^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
b
Spin only magnetic moment` mu=sqrt(n(n +2))`
where n= number of unpaied electrons. Number of unpaied in `Cr^(2+)([Ar] 3d^(4))` is 4 in `Co^(2+) ([Ar]rd^(1))` is 3. in `Fe^(2+)([Ar]3d^(6)` is 4. in `Mn^(2+)([Ar]3d^(6))`is 5.
As the numbe of unpaired elctrons in `Cr^(2+) and Fe^(2+)` are same, hence, `[Cr(H_(2)O)_(6)]^(2+) and [Fe(H_(2)O)_(6)]^(2+)` will have same magnetic moment.
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