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Question

Match the metal ions given in Column-I with the spin magnetic moments of the ions given in Column-II and assign the correct code :
Column-IColumn-IIa.Co3+i.8 BMb.Cr3+ii.35 BMc.Fe3+iii.3 BMd.Ni2+iv.24 BMv.15 BM

A
a-iv, b-i,c-ii,d-iii
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B
a-iii, b-v, c-i, d-ii
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C
a-i, b-ii, c-iii, d-iv
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D
a-iv, b-v, c-ii, d-i
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Solution

The correct option is D a-iv, b-v, c-ii, d-i
Co3+=[Ar]3d6, unpaired e (n) = 4
Spin magnetic moment =4(4+2)=24 BM
Cr3+=[Ar]3d3, unpaired e(n)=3
Spin magnetic moment =3(3+2)=15 BM
Fe3+=[Ar]3d5, unpaired e(n)=5
Spin magnetic moment =5(5+2)=35 BM
Ni2+=[Ar]3d8, unpaired e(n)=2
Spin magnetic moment =2(2+2)=8 BM

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