Among the statements (A) - (D), the incorrect ones are (A) Octahedral Co(III) complexes with strong, field ligands have very high magnetic moments (B) When ${\Delta _0}\, < \,P$, the $d$-electron configuration of Co(III) in an octahedral complex is $t_{eg}^4,\,\,e_g^2$ (C) Wavelength of light absorbed by $\,{[Co{(en)_3}]^{3 + }}$ is lower than that of ${[Co{F_6}]^{3 - }}$ (D) If the ${\Delta _0}$ for an octahedral complex of Co(III) is $18,000\,{\rm{c}}{{\rm{m}}^{ - 1}}$, the ${\Delta _t}$ for its tetrahedral complex with the same Ligand will be $16,000\,{\rm{c}}{{\rm{m}}^{ - 1}}$

NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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Among the statements (A) - (D), the incorrect ones are
(A) Octahedral Co(III) complexes with strong, field ligands have very high magnetic moments
(B) When

{\Delta _0}\, < \,P

, the

d

-electron configuration of Co(III) in an octahedral complex is

t_{eg}^4,\,\,e_g^2

\,{[Co{(en)_3}]^{3 + }}

is lower than that of

{[Co{F_6}]^{3 - }}

(D) If the

{\Delta _0}

for an octahedral complex of Co(III) is

18,000\,\mathrm{c}{\mathrm{m}^{ - 1}}

, the

{\Delta _t}

for its tetrahedral complex with the same Ligand will be

16,000\,\mathrm{c}{\mathrm{m}^{ - 1}}

View answer and explanation

Correct option: D

(A) and (D) only

Option D ((A) and (D) only) is correct because octahedral Co(III) complexes with strong field ligands are low spin and have low magnetic moments, and the relationship between

\Delta_0

and

\Delta_t

is not correctly represented.

NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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