Question

EAN (Effective Atomic Number) are equal in which of the following pair?

• A. $\left[Ni\right(CO{)}_4],[Fe(CN{)}_6{]}^{4-}$
• B. $\left[Ni\right(en{)}_2],[Fe(H_{2}O{)}_6{]}^{2+}$
• C. $\left[Co\right(CN{)}_6{]}^{3-},\left[Fe\right(CN{)}_6{]}^{4-}$
• D. All of the above

Answer 1

Answer: (D)

All of the above

EAN value of complexes,

$\left[Ni\right(CO{)}_4]=28+8=36$

$\left[Fe\right(CN{)}_6{]}^4=26-2+12=36$

$\left[Ni\right(en{)}_2]=28+8=36$

$\left[Fe\right(H_{2}O{)}_6{]}^{2+}=26-2+12=36$

$\left[Co\right(CN{)}_6{]}^3=27-3+12=36$

So all have same value of EAN.