Question

What is incorrect for $K_4\left[Fe\right(CN{)}_6]$?

• A. Oxidation number of iron is +2
• B. It is an octahedral complex
• C. It exhibits paramagnetic character
• D. It involves $d^{2}s{p}^3$ hybridisation

Answer 1

Answer: (C)

It exhibits paramagnetic character

$\left[K_{4}Fe\right(CN{)}_6]$ is diamagnetic in nature because electronic congiguration of $F{e}^{+2}$ is $1s^{2}2s^2{p}^{6}3s^2{p}^{6}3d^{6}4s^0$. Due to strong ligand (CN) all the electrons are paired in 3d subshell, thus, doesn't show paramagnetic character.