WORKSHEET ON Crystal Field Theory (CFT)

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Here’s a tabulation-based question paper (Fill-in-the-Blanks) focused on :-

Crystal Field Theory (CFT) for Class 12, based on NCERT:

Topic	Fill in the Blanks
1. Crystal Field Theory	According to Crystal Field Theory, the interaction between the __________ and the __________ leads to splitting of d-orbitals in metal ions.
2. d-Orbital Splitting in Octahedral Field	In an octahedral crystal field, the d-orbitals split into two sets: __________ and __________.
3. d-Orbital Splitting in Tetrahedral Field	In a tetrahedral crystal field, the d-orbitals split into two sets: __________ and __________.
4. Energy Difference in Octahedral Field	The energy difference between the two sets of d-orbitals in an octahedral field is called __________ and is represented by __________.
5. Strong Field Ligands	Ligands that cause greater splitting of d-orbitals are called __________ field ligands and result in __________ spin complexes.
6. Weak Field Ligands	Ligands that cause lesser splitting of d-orbitals are called __________ field ligands and usually lead to __________ spin complexes.
7. Splitting in Tetrahedral Complex	In tetrahedral complexes, the d-orbitals split in a reverse manner compared to octahedral complexes, with the __________ set having higher energy.
8. High Spin Complex	A high spin complex occurs when the crystal field splitting energy (Δ) is __________ compared to the pairing energy, leading to __________ electrons.
9. Low Spin Complex	A low spin complex occurs when the crystal field splitting energy (Δ) is __________ compared to the pairing energy, causing maximum __________ of electrons.
10. Factors Affecting Splitting Energy	The magnitude of crystal field splitting (Δ) depends on the nature of the __________ and the __________ of the metal ion.
11. Color of Coordination Compounds	The color of coordination compounds is due to the __________ transitions between the __________ orbitals of the metal ion.
12. Crystal Field Stabilization Energy (CFSE)	The stability of a complex due to crystal field splitting is quantified by the __________, represented as __________.
13. Octahedral Complex Example	An example of an octahedral complex where d-orbitals split according to CFT is __________.
14. Tetrahedral Complex Example	An example of a tetrahedral complex with reverse d-orbital splitting is __________.
15. Magnetic Properties of Complexes	Complexes with unpaired electrons are __________, while those with        paired electrons are __________.

This question paper format will help students test their understanding of Crystal Field Theory (CFT) and its key concepts.