Comprehension
Werner was the first to describe the bonding features in coordination compounds. But his theory could not answer basic questions like:
(i) Why only certain elements possess the remarkable property of forming coordination compounds?
(ii) Why the bonds in coordination compounds have directional properties ?
(iii) Why coordination compounds have characteristics magnetic and optical properties ?
Many approaches have been put forth to explain the nature of bonding in coordination compounds viz. Valence Bond Theory (VBT), Crystal Field Theory (CFT), Ligand Field Theory (LFT) and Molecular Orbital Theory (MOT). We shall focus our attention on elementary treatment of the application of VBT and CFT to coordination compounds.
According to this theory, the metal atom or ion under the influence of ligands can use its (n-1)d, ns np or ns, np, nd orbitals for hybridisation to yield a set of equivalent orbitals of definite geometry such as octahedial, tetrahedial, square planar and so on. These hybridised orbitals are allowed to overlap with ligand orbitals that can donate electron pairs for bonding.
(i) Why only certain elements possess the remarkable property of forming coordination compounds?
(ii) Why the bonds in coordination compounds have directional properties ?
(iii) Why coordination compounds have characteristics magnetic and optical properties ?
Many approaches have been put forth to explain the nature of bonding in coordination compounds viz. Valence Bond Theory (VBT), Crystal Field Theory (CFT), Ligand Field Theory (LFT) and Molecular Orbital Theory (MOT). We shall focus our attention on elementary treatment of the application of VBT and CFT to coordination compounds.
According to this theory, the metal atom or ion under the influence of ligands can use its (n-1)d, ns np or ns, np, nd orbitals for hybridisation to yield a set of equivalent orbitals of definite geometry such as octahedial, tetrahedial, square planar and so on. These hybridised orbitals are allowed to overlap with ligand orbitals that can donate electron pairs for bonding.
Question: 1
The formula which correctly represents Potassium tetra hydioxo zincate (II) is:
The formula which correctly represents Potassium tetra hydioxo zincate (II) is:
Updated On: Feb 28, 2025
- K[Zn(OH)4]
- K3[Zn(OH)4]3
- K4[Zn(OH)4]
- K2[Zn(OH)4]
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The Correct Option is D
Solution and Explanation
The correct option is (D) : K2[Zn(OH)4]
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Question: 2
CoCl3·6NH3 gives 3 modes of AgCl on reacting with AgNO3. The correct formula for this compound is:
CoCl3·6NH3 gives 3 modes of AgCl on reacting with AgNO3. The correct formula for this compound is:
Updated On: Feb 28, 2025
- [Co(NH3)6]Cl3
- [CoCI(NH3)5]Cl2·NH3
- [CoCl2(NH3)4]CI·2NH3
- [CoCl3 (NH3)3]·3NH3
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The Correct Option is A
Solution and Explanation
The correct option is (A) : [Co(NH3)6]Cl3
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Question: 3
Predict the shape of [Ni(CO)4] on the basis of VBT:
Predict the shape of [Ni(CO)4] on the basis of VBT:
Updated On: Feb 28, 2025
- Square Planar
- Tetrahedial
- Inner octahedral
- Outer octahedial
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The Correct Option is B
Solution and Explanation
The correct option is (B) : Tetrahedial
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Question: 4
Predict the type of hybridisation state in [CoF6]3-
Predict the type of hybridisation state in [CoF6]3-
Updated On: Feb 28, 2025
- sp3
- dsp2
- sp3d2
- d2sp3
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The Correct Option is C
Solution and Explanation
The correct option is (C) : sp3d2
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Question: 5
Which of the following pair of ions is colourless according to CFT?
Which of the following pair of ions is colourless according to CFT?
Updated On: Feb 28, 2025
- Ti4+, Zn2+
- V2+, Mn2+
- Sc3+, Cu2+
- Cr3+, Fe3+
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The Correct Option is A
Solution and Explanation
The correct option is (A) : Ti4+, Zn2+
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