Which among the following is a paramagnetic c | vedclass

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(C) The magnetic property of a complex depends on the number of unpaired electrons $(n)$. $A$ complex is paramagnetic if $n > 0$.$1. [Co(NH_3)_6]^{3+}

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$[CoBr_4]^{2-}$

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(C) The magnetic property of a complex depends on the number of unpaired electrons $(n)$. $A$ complex is paramagnetic if $n > 0$.$1. [Co(NH_3)_6]^{3+}$: $Co^{3+}$ is $3d^6$. $NH_3$ is a strong field ligand,causing pairing. All electrons are paired $(n=0)$,so it is diamagnetic.$2. [Pt(en)Cl_2]$: $Pt^{2+}$ is a $5d^8$ system. $5d$ series metals always form low-spin complexes with strong field ligands like $en$. All electrons are paired $(n=0)$,so it is diamagnetic.$3. [CoBr_4]^{2-}$: $Co^{2+}$ is $3d^7$. $Br^-$ is a weak field ligand,so no pairing occurs. The configuration is $e_g^4 t_{2g}^3$,resulting in $n=3$ unpaired electrons. Thus,it is paramagnetic.$4. Mo(CO)_6$: $Mo$ is in $0$ oxidation state $(4d^6)$. $CO$ is a strong field ligand,causing pairing. All electrons are paired $(n=0)$,so it is diamagnetic.Therefore,$[CoBr_4]^{2-}$ is the paramagnetic complex.

Which among the following is a paramagnetic complex?
$($At. No. $Mo = 42, Pt = 78)$

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Which among the following is a paramagnetic complex?$($At. No. $Mo = 42, Pt = 78)$