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The correct order of spin-only magnetic moments among the following is: (Atomic number: Mn= 25, Co=27, Ni=28, Zn=30 )

JEE Main 2018 — Chemistry Inorganic Chemistry

2018mcqmedium

The correct order of spin-only magnetic moments among the following is: (Atomic number: Mn=\mathrm{Mn}=Mn= 25,Co=27,Ni=28,Zn=3025, \mathrm{Co}=27, \mathrm{Ni}=28, \mathrm{Zn}=3025,Co=27,Ni=28,Zn=30 )

Official previous-year question

Held on 15 Apr 2018 · Verified 6 Jul 2026.

Options

  1. A

    [ZnCl4]2−>[NiCl4]2−>[CoCl4]2−>[MnCl4]2−\left[\mathrm{ZnCl}_4\right]^{2-}>\left[\mathrm{NiCl}_4\right]^{2-}>\left[\mathrm{CoCl}_4\right]^{2-}>\left[\mathrm{MnCl}_4\right]^{2-}[ZnCl4​]2−>[NiCl4​]2−>[CoCl4​]2−>[MnCl4​]2−

  2. B

    [CoCl4]2−>[MnCl4]2−>[NiCl4]2−>[ZnCl4]2−\left[\mathrm{CoCl}_4\right]^{2-}>\left[\mathrm{MnCl}_4\right]^{2-}>\left[\mathrm{NiCl}_4\right]^{2-}>\left[\mathrm{ZnCl}_4\right]^{2-}[CoCl4​]2−>[MnCl4​]2−>[NiCl4​]2−>[ZnCl4​]2−

  3. C

    [NiCl4]2−>[CoCl4]2−>[MnCl4]2−>[ZnCl4]2−\left[\mathrm{NiCl}_4\right]^{2-}>\left[\mathrm{CoCl}_4\right]^{2-}>\left[\mathrm{MnCl}_4\right]^{2-}>\left[\mathrm{ZnCl}_4\right]^{2-}[NiCl4​]2−>[CoCl4​]2−>[MnCl4​]2−>[ZnCl4​]2−

  4. D

    [MnCl4]2−>[CoCl4]2−>[NiCl4]2−>[ZnCl4]2−\left[\mathrm{MnCl}_4\right]^{2-}>\left[\mathrm{CoCl}_4\right]^{2-}>\left[\mathrm{NiCl}_4\right]^{2-}>\left[\mathrm{ZnCl}_4\right]^{2-}[MnCl4​]2−>[CoCl4​]2−>[NiCl4​]2−>[ZnCl4​]2−

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