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CBSE Class 12 Chemistry 2023 All Sets Solved Paper

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Question : 14 of 18
Marks: +1, -0
The magnetic moment of [NiCl4]2−[\mathrm{NiCl}_4]^{2-}
[Atomic number : Ni = 28]
Solution:  
The oxidation state of Ni in [NiCl4]2−=+2[\mathrm{NiCl}_4]^{2-}=+2
∴ Ni=[Ar]4s23d8\mathrm{Ni}=[\mathrm{Ar}]4s^23d^8
Ni+2=[Ar]3d8\mathrm{Ni}^{+2}=[\mathrm{Ar}]3d^8
Number of unpaired electron = 2
∴ magnetic moment = 2(2+2)\sqrt{2(2+2)} B.M.
= 8\sqrt{8}
= 2.82 BM
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