Here are 20 multiple-choice questions (MCQs) based on Valence Bond Theory (VBT) from the Coordination Compounds chapter for Class 12 (NCERT):
Valence Bond Theory (VBT) explains the bonding in coordination compounds through:
- a) Covalent bonds
- b) Overlapping of atomic orbitals
- c) Ionic bonds
- d) Hydrogen bonding
According to VBT, the hybridization in [Co(NH₃)₆]³⁺ is:
- a) sp³
- b) dsp²
- c) d²sp³
- d) sp²
Which of the following statements is true according to VBT?
- a) Bonding involves only s-orbitals.
- b) Ligands donate lone pairs of electrons to the central metal ion.
- c) No electron pairing occurs in the central metal ion.
- d) Ligands do not participate in hybridization.
The geometry of a coordination complex with sp³ hybridization is:
- a) Tetrahedral
- b) Square planar
- c) Octahedral
- d) Linear
In VBT, the formation of a complex involves:
- a) Complete transfer of electrons
- b) Overlap of ligand orbitals with empty metal orbitals
- c) Overlap of ligand orbitals with filled metal orbitals
- d) Ionic bonding between metal and ligand
The hybridization of the central metal ion in a square planar complex is:
- a) sp³
- b) dsp²
- c) d²sp³
- d) sp²
According to VBT, in [Fe(CN)₆]³⁻, the hybridization of Fe³⁺ is:
- a) sp³
- b) sp²
- c) d²sp³
- d) dsp²
Which of the following is an example of a complex with dsp² hybridization?
- a) [Ni(CN)₄]²⁻
- b) [Co(NH₃)₆]³⁺
- c) [Ni(CO)₄]
- d) [Fe(CN)₆]³⁻
In VBT, the hybrid orbitals of the central metal ion overlap with:
- a) d-orbitals of the ligands
- b) s-orbitals of the ligands
- c) p-orbitals of the ligands
- d) Atomic orbitals of the ligands containing lone pairs
A coordination complex with d²sp³ hybridization will have which of the following geometries?
- a) Tetrahedral
- b) Square planar
- c) Octahedral
- d) Linear
Which of the following complexes is diamagnetic according to VBT?
- a) [Ni(CO)₄]
- b) [CoF₆]³⁻
- c) [Fe(CN)₆]³⁻
- d) [Cu(NH₃)₄]²⁺
According to VBT, the magnetic properties of a coordination compound depend on:
- a) The number of ligands
- b) The hybridization of the metal ion
- c) The number of unpaired electrons in the central metal ion
- d) The size of the central metal ion
In [Ni(CN)₄]²⁻, the hybridization of Ni²⁺ is:
- a) sp³
- b) dsp²
- c) d²sp³
- d) sp²
Which of the following complexes has an octahedral geometry according to VBT?
- a) [Ni(CN)₄]²⁻
- b) [Co(NH₃)₆]³⁺
- c) [CuCl₄]²⁻
- d) [Pt(NH₃)₂Cl₂]
According to VBT, in [Fe(CN)₆]⁴⁻, Fe²⁺ undergoes:
- a) sp³ hybridization
- b) d²sp³ hybridization
- c) dsp² hybridization
- d) sp² hybridization
The hybridization in a tetrahedral coordination complex is generally:
- a) dsp²
- b) d²sp³
- c) sp³
- d) sp²
Which of the following is a limitation of VBT?
- a) It explains the magnetic properties of all complexes.
- b) It explains the color of coordination complexes.
- c) It fails to explain the spectra of complexes.
- d) It predicts all geometries correctly.
Which of the following complexes is paramagnetic according to VBT?
- a) [Fe(CN)₆]⁴⁻
- b) [Co(CN)₆]³⁻
- c) [Ni(CO)₄]
- d) [CoF₆]³⁻
The geometry of [Pt(NH₃)₂Cl₂] according to VBT is:
- a) Tetrahedral
- b) Square planar
- c) Octahedral
- d) Trigonal planar
According to VBT, the number of unpaired electrons in [Ni(CO)₄] is:
- a) 0
- b) 1
- c) 2
- d) 3
These MCQs are based on Valence Bond Theory and focus on understanding hybridization, geometries, and magnetic properties of coordination compounds as covered in the NCERT syllabus.
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