Expert 1 - CFT + JT

Among the following complexes, the one which shows zero crystal field stabilization energy (CFSE) is

• [Mn (H₂O)₆] ³⁺

• [Fe (H₂O)₆] ³⁺

• [Co (H₂O)₆] 2⁺

• [Co (H₂O)₆] 2⁺

The Jahn-Teller effect is not observed in high spin octahedral complexes of...

• ...d⁷ ions.

• ...d⁸ ions.

• ... d⁴ ions.

• ... d⁹ ions.

A magnetic moment of 1.73 μ_B will be shown by one among the following complexes. Please select it.

Cu: [Ar] 3d¹⁰ 4s¹ | Ni: [Ar] 3d⁸ 4s² | Ti: [Ar] 3d² 4s² | Co: [Ar] 3d⁷ 4s²

• [Cu(NH₃)₄]²⁺

• [Ni(CN)₄]^2-

• [TiCl₄]

• [CoCl₄]^4-

In which of the following Cobalt coordination complexes the magnitude of Δ_oct will be maximum?

• [Co(H₂O)₆] ³⁺

• [Co(NH₃)₆] ³⁺

• [Co(CN)₆] ^3-

• [Co (C₂O₄)₃]^3-

Of the following complexes , which is diamagnetic in nature?

Cu: [Ar] 3d¹⁰ 4s¹ | Ni: [Ar] 3d⁸ 4s² | Co: [Ar] 3d⁷ 4s²

• [Ni (CN)₄]^2-

• [CuCl₄]^2-

• [CoF₆]^3-

• [NiCl₄]^2-

Find CFSE (EECL) of [Fe(H₂​O)₆​]²⁺ and of [NiCl₄^−​]²⁻.

Fe: [Ar] 3d⁶ 4s² | Ni: [Ar] 3d⁸ 4s²

• -0.4Δ₀ and -0.8 Δ_t

• -0.4Δ₀ and -1.6 Δ_t

• -0.8 Δ₀ and -0.4 Δ_t

• -1.2 Δ₀ and -1.2 Δ_t

Which of the following order is correct in spectrochemical series of ligands?

• NO₂⁻​< C_2​O₄^2−​ < NO₂⁻< Cl⁻<F⁻​< CN⁻

• F⁻ < Cl⁻< NO₂⁻​ < CN^- < C_2​O₄^2-

• Cl⁻ < F⁻ < C_2​O₄^2−​ < NH₃ < CN⁻

• Cl⁻ < F⁻ < H₂O^​ < NH₃ < en < bipy < CN^-