JEE Main · 2022 · 24 Jun 2022 · Shift 2 · Coordination Compounds

Transition metal complex with highest value of crystal field splitting (

Δ_{0}

) will be

(A) $[Cr (H_{2} O)_{6}]^{3 +}$
(B) $[Mo (H_{2} O)_{6}]^{3 +}$
(C) $[Fe (H_{2} O)_{6}]^{3 +}$
(D) $[Os (H_{2} O)_{6}]^{3 +}$ ✓ Correct

Answer: (D)

Solution

Crystal field splitting energy (

Δ_{0}

) increases down a group in the transition series. For the same ligand (water) and oxidation state (+3), the order of

Δ_{0}

is: 5d > 4d > 3d series.

Among the given complexes:

Cr is 3d series
Mo is 4d series
Fe is 3d series
Os is 5d series

Therefore,

[Os (H_{2} O)_{6}]^{3 +}

will have the highest crystal field splitting.

JEE Main · 2022 · 24 Jun 2022 · Shift 2 · Single correct option

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