Q47 / 150 · MHT CET 2026 (18 April Shift 2) · Chemistry
What is EAN for metal ion in $[\text{Fe(CN)}_6]^{3-}$ ?
- A$37$
- B$36$
- Correct answerC$35$
- D$34$
Solution
The atomic number of iron (Fe) is $26$.
Let the oxidation state of Fe in $[\text{Fe(CN)}_6]^{3-}$ be $x$.
$x + 6(-1) = -3$
$x = +3$
The formula for Effective Atomic Number (EAN) is:
$\text{EAN} = Z - \text{Oxidation state} + 2 \times (\text{Coordination number})$
$\text{EAN} = 26 - 3 + 2 \times 6$
$\text{EAN} = 23 + 12 = 35$
Answer: $35$
Let the oxidation state of Fe in $[\text{Fe(CN)}_6]^{3-}$ be $x$.
$x + 6(-1) = -3$
$x = +3$
The formula for Effective Atomic Number (EAN) is:
$\text{EAN} = Z - \text{Oxidation state} + 2 \times (\text{Coordination number})$
$\text{EAN} = 26 - 3 + 2 \times 6$
$\text{EAN} = 23 + 12 = 35$
Answer: $35$
Hence, the correct answer is option: 'C'.