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The pair having the same magnetic moment...

The pair having the same magnetic moment is :
(Atomic Nos : `Cr=24`, `Mn=25`, `Fe=26`, `Co=27`) [ M n ( H 2 O ) 6 ] 2 + & [ C r ( H 2 O ) 6 ] 2 + [ C o C l 4 ] 2 − & [ F e ( H 2 O ) 6 ] 2 + [ C r ( H 2 O ) 6 ] 2 + & [ C o C l 4 ] 2 − [ C r ( H 2 O ) 6 ] 2 + & [ F e ( H 2 O ) 6 ] 2 +

A

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

B

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

C

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

D

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

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