Among the statements (A-D) , the incorrect ones are
A) Octahedral $C o (I I I)$ complexes with strong field ligands have very high magnetic moments
B) When $Δ_{o} < P$ , the d-electron configuration of $C o (I I I)$ in an octahedral complex is $t_{2 g}^{4} e_{g}^{2}$
C) Wave length of light absorbed by ${[C o {(e n)}_{3}]}^{3 +}$ is lower than that of ${[C o F_{6}]}^{3 -}$
D) If the $Δ_{o}$ for an octahedral complex of $C o (I I I)$ is $18, 000 c m^{- 1}$ , the $Δ_{t}$ for its tetrahedral complex with the same ligand will be $16, 000 c m^{- 1}$

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A and D only

A and B only

C and D only

B and C only

answer is D.

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Detailed Solution

A ) Octahedral Co(III) complexes with strong field ligand have low magnetic moment due to formation of lower spin complex
B) $Δ_{o} < P s o C o (I I I) t_{2 g}^{4} e_{g}^{2}$
C)en is stronger field ligand compare to fluoride anion $(F^{-})$
$Δ_{o} (e n) > Δ_{o} (F^{-})$
$λ_{e n} < λ_{F^{-}}$
D) $Δ = Δ_{0} \times \frac{4}{9} = 18000 \times \frac{4}{9} = 8000 c m^{- 1}$
Statement (A) and (D) are incorrect