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 ∆ 0 < P , the d-electron configuration of C o I I I in an octahedral complex is t e g 4 e g 2 c Wavelength of light absorbed by C o e n 3 3 + is lower than that of C o F 6 3 - d If the ∆ 0 for an octahedral complex of C o I I I is 18,000 c m - 1 , the ∆ t for its tetra

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So if there are strong field ligands in complex, pairing of electrons will take place, due to which number of unpaired electrons decrease due to which magnetic moment decrease. ( c ) Splitting power of ethylenediamine (en) is greater than fluoride F − ligand therefore more energy absorbed by Co en 3 + as compared to CoF 6 3 − So wave length of light absorbed by Co en 3 + is lower than that of CoF 6 3 − (d) Δ t = 4 9 Δ 0 so if Δ 0 = 18 , 000 cm − 1 Δ t = 4 9 × 18000 = 8000 cm − 1 Statement ( a ) and ( d ) are incorr