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In a coordination entity, the electronic configuration of the central metal ion is t2g3 eg1
Draw the crystal field splitting diagram for the above complex.
Concept: Bonding in Coordination Compounds >> Crystal Field Theory (CFT)
Account for the following:
Ti(IV) is more stable than the Ti (II) or Ti(III).
Concept: Importance and Applications of Coordination Compounds
The CFSE of [CoCl6]3– is 18000 cm–1 the CFSE for [CoCl4]– will be ______.
Concept: Bonding in Coordination Compounds >> Crystal Field Theory (CFT)
The number of ions formed on dissolving one molecule of FeSO4.(NH4)2SO4.6H2O in water is ______.
Concept: Concept of Coordination Compounds
Using Valence bond theory, explain the following in relation to the paramagnetic complex [Mn(CN)6]3−
- type of hybridization
- magnetic moment value
- type of complex – inner, outer orbital complex
Concept: Bonding in Coordination Compounds >> Valence Bond Theory (VBT)
What are Homoleptic complexes?
Concept: Important Terms Pertaining to Coordination Compounds
Why chelate complexes are more stable than complexes with unidentate ligands?
Concept: Important Terms Pertaining to Coordination Compounds
What is the secondary valency of cobalt in [Co(en2)Cl2]+?
Concept: Werner’s Theory of Coordination Compounds
Assertion (A): Trans [CrCl2(ox)2]3− shows optical isomerism.
Reason (R): Optical isomerism is common in octahedral complexes involving didentate ligands.
Concept: Isomerism in Coordination Compounds >> Stereoisomerism
On the basis of Crystal Field theory, write the electronic configuration for the d5 ion with a strong field ligand for which Δ0 > P.
Concept: Bonding in Coordination Compounds >> Crystal Field Theory (CFT)
[Ni(CO)4] has tetrahedral geometry while [Ni(CN)4]2− has square planar, yet both exhibit diamagnetism. Explain.
[Atomic number: Ni = 28]
Concept: Bonding in Coordination Compounds >> Valence Bond Theory (VBT)
Assertion (A): EDTA is a hexadentate ligand.
Reason (R): EDTA has 2 nitrogen and 4 oxygen donor atoms.
Concept: Important Terms Pertaining to Coordination Compounds
Explain [Fe(CN)6]3− is an inner orbital complex, whereas [FeF6]3− is an outer orbital complex.
[Atomic number: Fe = 26]
Concept: Bonding in Coordination Compounds >> Magnetic Properties of Coordination Compounds
Assertion (A): [Co(NH3)5SO4]Cl gives a white precipitate with silver nitrate solution.
Reason (R): The complex dissociates to give Cl− and \[\ce{SO^{2-}_4}\] ions.
Concept: Werner’s Theory of Coordination Compounds
A solution of [Ni(H2O)6]2+ is green, but a solution of [Ni(CO)4] is colourless. Explain.
[Atomic number: Ni = 28]
Concept: Bonding in Coordination Compounds >> Colour in Coordination Compounds
Does ionization isomer for the following compound exist? Justify your answer.
\[\ce{Hg[Co(SCN)4]}\]
Concept: Important Terms Pertaining to Coordination Compounds
Is the central metal atom in coordination complexes a Lewis acid or a Lewis base? Explain.
Concept: Important Terms Pertaining to Coordination Compounds
Read the passage carefully and answer the questions that follow.
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Crystal field splitting by various ligands Metal complexes show different colours due to d-d transitions. The complex absorbs light of specific wavelength to promote the electron from t2g to eg level. The colour of the complex is due to the transmitted light, which is complementary of the colour absorbed. The wave number of light absorbed by different complexes of Cr ion are given below:
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Answer the following questions:
(a) Out of ligands "A", "B", "C" and "D", which ligand causes maximum crystal field splitting? Why?
OR
Which of the two, “A” or “D” will be a weak field ligand? Why?
(b) Which of the complexes will be violet in colour? [CrA6]3- or [CrB6]3+ and why?
(Given: If 560 - 570 nm of light is absorbed, the colour of the complex observed is violet.)
(c) If the ligands attached to Cr3+ ion in the complexes given in the table above are water, cyanide ion, chloride ion, and ammonia (not in this order).
Identify the ligand, write the formula and IUPAC name of the following:
- [CrA6]3-
- [CrC6]3+
Concept: Bonding in Coordination Compounds >> Crystal Field Theory (CFT)
Explain the following, giving two examples:
Homoleptic
Concept: Important Terms Pertaining to Coordination Compounds
Explain the following, giving two examples:
Heteroleptic
Concept: Important Terms Pertaining to Coordination Compounds
