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Solution


Q.

The calculated spin only magnetic moment of Cr2+ ion is             [2020]
1 3.87 BM  
2 4.90 BM  
3 5.92 BM  
4 2.84 BM  

Ans.

(2)

Cr:3d54s1, Cr2+:3d4 has four unpaired electrons.  

μ=n(n+2)=4(4+2)=24≈4.90 B.M.