Question
What is EAN for metal ion in [ Fe(CN) _6]^ 3- ?
MHT CET
Chemistry
Coordination Compounds
2026
MHT CET 2026 (18 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 37
- B. 36
- C. 35
- D. 34
Answer
C. 35
Step-by-step solution
The atomic number of iron (Fe) is 26. Let the oxidation state of Fe in [ Fe(CN) _6]^ 3- be x. x + 6(-1) = -3 x = +3 The formula for Effective Atomic Number (EAN) is: EAN = Z - Oxidation state + 2 ( Coordination number ) EAN = 26 - 3 + 2 6 EAN = 23 + 12 = 35 Answer: 35
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