Crystal Field Theory MCQs
Crystal Field Theory (CFT) describes the interaction between metals and ligands in coordination compounds, explaining their structure, color, formation, and magnetic properties. According to CFT, metal-ligand bonds are electrostatic, formed between metal cations and negatively charged ligands. Ligands cause the splitting of degenerate orbitals into two groups with different energies. In an octahedral environment, crystal field splitting results in the formation of lower energy ( d_{xy} ), ( d_{yz} ), and ( d_{xz} ) orbitals, known as ( t_{2g} ) orbitals, and higher energy ( d_{x^2-y^2} ) and ( d_{z^2} ) orbitals, known as ( e_g ) orbitals. CFT explains that the color of coordination compounds is due to d-d electron transitions.
Which of the following is paramagnetic?
(a) [CoBr]42-
(b) Mo(Co)6
(c) [Pt(en)Cl2]
(d) [Co(NH3)6]3+
Which of the following complexes shows zero crystal field stabilization energy?
(a) [Co(H2O)6]3+
(b) [Fe(H2O)6]3+
(c) [Co(H2O)6]2+
(d) [Mn(H2O)6]3+
Which of the following d orbitals take part in the octahedral complex with d2sp3 hybridisation?
(a) dxy, dyz
(b) dxz, dx2−y2
(c) dx2−y2, dz2
(d) dz2, dxz
Which of the following complexes has a magnetic moment of 1.73 BM?
(a) [Ni(CN)4]2-
(b) TiCl4
(c) [Cu(NH3)4]2+
(d) [CoCl6]4-
For a high spin d4 octahedral complex the crystal field splitting energy will be
(a) -1.6 Δo
(b) -0.8 Δo
(c) -0.6 Δo
(d) -1.2 Δo
Tetraamminecopper(II) sulphate is _ in colour.
(a) violet
(b) blue
(c) green
(d) red
Which of the following is a bidentate ligand?
(a) Br
(b) CH3NH2
(c) C2O42-
(d) CH3CN
The compound, which does not contain a metal-carbon bond is
(a) K[Pt(C2H4)Cl3]
(b) C2H5MgBr
(c) Ni(CO)4
(d) Al(OC2H5)3
The correct increasing order of splitting power of ligands according to spectrochemical series is
(a) Cl–< OH–< CN–
(b) Cl–< CN–< OH–
(c) OH–< Cl–< CN–
(d) OH–< CN–< Cl–
How many unpaired electrons are present in [CoF6]3- complex?
(a) 4
(b) zero
(c) 2
(d) 3
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