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Here are 20 multiple-choice questions (MCQs) based on Crystal Field Theory (CFT) for Class 12 (NCERT):
According to Crystal Field Theory, ligands are considered as:
- a) Point charges
- b) Dipoles
- c) Neutral atoms
- d) Free electrons
In an octahedral crystal field, the d-orbitals split into:
- a) e₁g and e₂g
- b) t₂g and eg
- c) sp and sp³
- d) dsp² and sp²
The energy difference between the split d-orbitals in an octahedral field is called:
- a) Bond dissociation energy
- b) Crystal field splitting energy
- c) Lattice energy
- d) Activation energy
Which of the following is an example of a weak field ligand?
- a) CN⁻
- b) CO
- c) H₂O
- d) NH₃
Strong field ligands generally result in:
- a) High spin complexes
- b) Low spin complexes
- c) Hybrid orbitals
- d) Paramagnetic complexes
In a tetrahedral field, the splitting pattern of d-orbitals is:
- a) eg orbitals have higher energy
- b) t₂g orbitals have higher energy
- c) No splitting occurs
- d) All d-orbitals have the same energy
The color of a coordination complex is due to:
- a) Absorption of light and promotion of an electron
- b) Emission of light
- c) Thermal energy
- d) Lattice energy
In octahedral complexes, the t₂g orbitals point towards:
- a) The ligands
- b) Between the ligands
- c) Away from the center
- d) At the center of the ion
Which of the following ligands would produce the greatest crystal field splitting?
- a) F⁻
- b) Cl⁻
- c) CN⁻
- d) OH⁻
For a low spin octahedral complex, the pairing of electrons occurs because:
- a) Δ₀ > pairing energy
- b) Δ₀ < pairing energy
- c) Ligands are weak
- d) No splitting occurs
Which of the following complexes is likely to be paramagnetic?
- a) [Fe(CN)₆]³⁻
- b) [Co(NH₃)₆]³⁺
- c) [Ni(CN)₄]²⁻
- d) [CuCl₄]²⁻
The Crystal Field Stabilization Energy (CFSE) depends on:
- a) The splitting energy and the arrangement of electrons
- b) The bond angles of the complex
- c) The number of ligands only
- d) The atomic mass of the metal ion
In an octahedral complex, the eg orbitals are:
- a) dz² and dx²–y²
- b) dxy and dz²
- c) dxy and dx²–y²
- d) dxz and dyz
Which of the following will form a high spin octahedral complex?
- a) [Fe(CN)₆]³⁻
- b) [FeF₆]³⁻
- c) [Co(CN)₆]³⁻
- d) [Ni(CN)₄]²⁻
The tetrahedral crystal field splitting energy (Δt) is:
- a) Greater than octahedral splitting energy (Δ₀)
- b) Half of the octahedral splitting energy (Δ₀)
- c) Smaller than the square planar field splitting
- d) Equal to octahedral splitting energy
In square planar complexes, the hybridization of the central metal ion is generally:
- a) dsp²
- b) sp³
- c) d²sp³
- d) sp²d²
A tetrahedral complex is more likely to be:
- a) Low spin due to weak field ligands
- b) High spin due to weak field ligands
- c) Diamagnetic in nature
- d) Square planar in shape
Which of the following statements is true for d⁸ metal ions in square planar geometry?
- a) They have no unpaired electrons
- b) They are paramagnetic
- c) They form high spin complexes
- d) Their hybridization is sp³
The number of unpaired electrons in [CoF₆]³⁻ is:
- a) 3
- b) 4
- c) 0
- d) 1
In an octahedral field, weak field ligands cause:
- a) Maximum electron pairing
- b) Minimum electron pairing
- c) Greater splitting of orbitals
- d) Formation of low spin complexes
These MCQs are designed to cover the important aspects of Crystal Field Theory as per the NCERT syllabus.
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