Q40
jee_main_2025_02_april_morning
Crystal Field Theory
Given below are two statements :
Statement (I): In octahedral complexes, when Delta_0 < P high spin complexes are formed. When Delta_0 > P low spin complexes are formed.
Statement (II) : In tetrahedral complexes because of Delta_mathrmt < mathrmP, low spin complexes are rarely formed.
In the light of the above statements, choose the most appropriate answer from the options given below:
Solution
### Related Formula
Crystal field splitting values relation for matching configuration choices:
Delta_mathrmt = frac49Delta_0
### Core Logic
Let's verify both rules based on Crystal Field Theory principles:
* **Statement I**: In octahedral configurations, if pairing penalty energy P exceeds field split magnitude Delta_0, electrons prefer moving to upper sub-shells, creating high-spin states. Conversely, if Delta_0 > P, forced pairing occurs, creating low-spin complexes. (Statement I is accurate).
* **Statement II**: Because tetrahedral configurations separate by an extremely narrow gap magnitude Delta_mathrmt (about half of octahedral field splits), the value almost never exceeds standard pairing energy P. Electrons consistently choose higher sub-levels rather than pairing up, meaning low-spin arrangements are extremely rare. (Statement II is accurate).
### Step 1: Verdict
Therefore, both Statement I and Statement II are correct.
### Pattern Recognition
Tetrahedral configurations are systematically assumed to be high-spin unless special structural properties dictate otherwise, due to the Delta_mathrmt < P constraint.
### Evaluation Rubric / Model Answer
null
### Chapter Mix
Class 12 Chemistry: Coordination Compounds
