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Question

Chemistry Question on d -and f -Block Elements

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 II
a.Co3+Co^{3+}
b.Cr3+Cr^{3+}
c.Fe3+Fe^{3+}
dNi2+Ni^{2+}
v
A

a - iii , b - v , c - i , d - ii

B

a - iv , b - v , c - ii , d - i

C

a - iv , b - i, c - ii , d - iii

D

a - i , b - ii , c - iii , d - iv

Answer

a - iv , b - v , c - ii , d - i

Explanation

Solution

Co3+=[Ar]3d6Co ^{3+}=[ Ar ] \,3 d ^{6}, Unpaired e(n)=4e ^{-}( n )=4

Spin magnetic moment =4(4+2)=24BM=\sqrt{4(4+2)}=\sqrt{24}\, BM
Cr3+=[Ar]3d3Cr ^{3+}=[ Ar ] \,3 d ^{3}, Unpaired e(n)=3e ^{-}( n )=3

Spin magnetic moment =3(3+2)=15BM=\sqrt{3(3+2)}=\sqrt{15} \,BM
Fe3+=[Ar]3d5Fe ^{3+}=[ Ar ] \,3 d ^{5}, Unpaired e(n)=5e ^{-}( n )=5

Spin magnetic moment =5(5+2)=35BM=\sqrt{5(5+2)}=\sqrt{35} \,BM
Ni2+=[Ar]3d8Ni ^{2+}=[ Ar ] \,3 d ^{8}, Unpaired e(n)=2e ^{-}( n )=2

Spin magnetic moment =2(2+2)=8BM=\sqrt{2(2+2)}=\sqrt{8}\, BM