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Q.

The number of unpaired in the central metal ion of brown ring complex is 

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a

2

b

3

c

4

d

5

answer is A.

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Detailed Solution

The brown ring complex is [Fe(H2O)5(NO)]SO4. The oxidation state of Fe in the brown ring complex is +1 and its outer electronic configuration becomes 3d64s1. NO ligand is a strong ligand, therefore when NO approaching to Fe, its electronic configuration becomes 3d74s0. Therefore, the number of unpaired electrons of Fe becomes 3.

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