Ean Rule
The effective atomic number (EAN) of Fe in [Fe(CN)₆]⁴⁻ is:
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About This Question
- Subject
- chemistry
- Chapter
- coordination compounds
- Topic
- ean rule
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
36
The Effective Atomic Number (EAN) is calculated as: EAN=Z−(OxidationState)+2×(CoordinationNumber) For Fe in [Fe(CN)6]4−:
- Atomic Number (Z) of Fe =26.
- Oxidation State: x+6(−1)=−4⟹x=+2.
- Coordination Number: 6 (monodentate CN− ligands). EAN=26−2+(2×6)=24+12=36
- 36 is the atomic number of Krypton (Kr). The complex follows the noble gas rule and is very stable.
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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