Q26 / 150 · MHT CET 2026 (17 April Shift 2) · Chemistry
What is the EAN of metal ion in $[\text{Cu(NH}_3)_4]^{2+}$ ?
- Correct answerA$35$
- B$27$
- C$29$
- D$36$
Solution
The effective atomic number (EAN) is calculated using the formula:
$\text{EAN} = Z - \text{O.S.} + 2 \times \text{C.N.}$
For the complex $[\text{Cu(NH}_3)_4]^{2+}$:
Atomic number of copper ($Z$) = $29$
Oxidation state of copper ($\text{O.S.}$) = $+2$
Coordination number ($\text{C.N.}$) = $4$
Substituting the values:
$\text{EAN} = 29 - 2 + 2 \times 4$
$\text{EAN} = 27 + 8 = 35$
Answer: $35$
$\text{EAN} = Z - \text{O.S.} + 2 \times \text{C.N.}$
For the complex $[\text{Cu(NH}_3)_4]^{2+}$:
Atomic number of copper ($Z$) = $29$
Oxidation state of copper ($\text{O.S.}$) = $+2$
Coordination number ($\text{C.N.}$) = $4$
Substituting the values:
$\text{EAN} = 29 - 2 + 2 \times 4$
$\text{EAN} = 27 + 8 = 35$
Answer: $35$
Hence, the correct answer is option: 'A'.