The species that has a spin-only magnetic moment of 5 . 9 BM , is : ( T d = tetrahedral)

1. ${\left[\mathrm{Ni}(\mathrm{CN}{)}_4\right]}^{2-}\text{ (square planar) }$
2. ${\left[{\mathrm{NiCl}}_4\right]}^{2-}\left({\mathrm{T}}_{\mathrm{d}}\right)$
3. $\mathrm{Ni}(\mathrm{CO}{)}_4\left({\mathrm{T}}_{\mathrm{d}}\right)$
4. ${\left[{\mathrm{MnBr}}_4\right]}^{2-}\left({\mathrm{T}}_{\mathrm{d}}\right)$

Solution

Asked in: JEE Main 2020 (06 Sep Shift 1)

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