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Question:

Match list I with list II and select the correct answer using codes given below the lists:
List I
Metal ion
List II
Magnetic moment (BM)
A Cr3+ 1
B Fe2+ 2
C Ni2+ 3
D Mn2+ 4
5
8

A-4, B-3, C-5, D-1

A-4, B-5, C-3, D-1

A-1, B-3, C-5, D-4

A-2, B-3, C-5, D-1

Solution:

For Cr3+=3d3, μ=√3(3+2)=√15 BM
For Fe2+=3d6, μ=√4(4+2)=√24 BM
For Ni2+=3d8, μ=√2(2+2)=√8 BM
For Mn2+=3d5, μ=√5(5+2)=√35 BM
Hence, option A-4, B-3, C-5, D-1 is correct.