Question

The effective atomic number of central metal ion is wrongly calculated in the following complex?

• A. In $\left[Ni\right(CO{)}_4]$ the EAN of Ni is 36
• B. In $K_2\left[Ni\right(CN{)}_4]$ the EAN of Ni is 36
• C. In $K_3\left[Fe\right(CN{)}_6]$the EAN of Fe 35
• D. In $\left[Cr\right(N{H}_3{)}_6]C{l}_3$ the EAN of Cr is 33

Answer 1

The correct option is B In $K_2\left[Ni\right(CN{)}_4]$ the EAN of Ni is 36

EAN value of complexes as follows by using formula $Z-X+Y$

Where Z= Atomic number of metal ion
X = oxidation state of metal ion
Y = number of electrons donated by ligands

1. $=28-0+8=36$
2. $=28-2+8=34$
   
3. $=26-3+12=35$
   
4. $=24-3+12=33$

Option B is correct.