Ean Rule
Effective atomic number (EAN) of Co in [Co(NO2)(NH3)5]2+ (atomic number of Co = 27) is:
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About This Question
- Subject
- chemistry
- Chapter
- coordination compounds
- Topic
- ean rule
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
36
- Formula: EAN=Z−(Oxidation State)+(Donated electrons from ligands).
- Oxidation State (OS):
- Let Co be x. NO2 is −1. NH3 is 0.
- x+(−1)+5(0)=+2⟹x=+3.
- Ligand Donation:
- One NO2− donates 2 electrons.
- Five NH3 donate 5×2=10 electrons.
- Total donation =12 electrons.
- Calculation: EAN=27−3+12=24+12=36.
- Significance: An EAN of 36 matches the noble gas configuration of Krypton, suggesting high stability.
This medium difficulty chemistry question is from the chapter coordination compounds, covering the topic of ean rule. It appeared in the 2025 exam.
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