JEE Main 2025 — Coordination Compounds Question with Solution

(A) ${\left[{\mathrm{MnBr}}_4\right]}^{2-}$

${\mathrm{Mn}}^{+2}\Rightarrow [\mathrm{Ar}]3{\mathrm{d}}^5$

In presence of ligand field

$\Rightarrow {\mathrm{sp}}^3$ hybridization, paramagnetic in nature

(B) ${\left[{\mathrm{FeF}}_6\right]}^{3-}$

$${\mathrm{Fe}}^{+3}\Rightarrow [\mathrm{Ar}]3{\mathrm{d}}^5$$

In presence of ligand field

$\Rightarrow {\mathrm{sp}}^3{\mathrm{d}}^2$ hybridization, paramagnetic in nature

(C) ${\left[\mathrm{Co}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$

$${\mathrm{Co}}^{+3}\Rightarrow [\mathrm{Ar}]3{\mathrm{d}}^6$$

In presence of ligand field

$\Rightarrow {\mathrm{d}}^2{\mathrm{sp}}^3$ hybridization, diamagnetic in nature

$$\text{ (D) }\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$$

$${\mathrm{Ni}}^0\Rightarrow [\mathrm{Ar}]3{\mathrm{d}}^{8}4{\mathrm{s}}^2$$

In presence of ligand field

$\Rightarrow {\mathrm{sp}}^3$ hybridization, diamagnetic in nature