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Among the following complexes , which...

Among the following complexes , which has a magnetic moment of 5.9 BM
`Ni (CO)_(4) [Fe (H_(2)O)_(6)]^(2+),[Co(NH_(3))_(6)]^(3+),[mnBr_(4)]^(2-), [Zn(NH_(3))_(4)]^(2+)`

A

`Ni(CO)_(4)`

B

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

C

`[Co(NH_(3))_(6)]^(3+)`

D

`[MnBr_(4)]^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
D
`Mn^(2+) [Z=25 ]: [Ar] 3d ^(5) : 5 ` unpaired electrons .

`"in" [MnBr_(4)]^(2-)` , five unpaired electrons are present , thus it has magnetic moment of 5.9 BM.
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Among the following complexes , how many have 'spin only' magnetic moment of 2.83 B.M. ? [Ni(CO)_4],[Ni(CN)_4]^(2-),[NiCl_2( P Ph_3)_2], [NiCl_4]^(2-),[NiF_6]^(2-),[NiF_6]^(4-),[Ni(NH_3)_6]^(2+),[Ni(en)_3]^(2+),[Ni(H_2O)_6]^(2+)

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Knowledge Check

  • Among the following complexes (K - P), which of the following are diamagnetic? K_(3)[Fe(CN_6)](K),[Co(NH_3)_(6)]Cl_(3)(L), Na_(3)[Co("oxalate")_3)](M),[Ni(H_2O)_(6)]Cl_(2)(N) , K_(2)[Pt(CN)_(4)](O) and [Zn(H_2O)_(6)](NO_3)_(2)(P) .

    A
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    C
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    A
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