Question

Which of the following compounds will be repelled when placed in an external magnetic field?

• A. $\text{Na}_2[\text{CuCl}_4]$
• B. $\text{Na}_2[\text{CdCl}_4]$
• C. $\text{K}_4[\text{Fe(CN)}_6]$
• D. $\text{K}_3[\text{Fe(CN)}_6]$

Answer 1

Answer: (C)

$\text{K}_4[\text{Fe(CN)}_6]$

Answer 2

$\text{K}_4[\text{Fe(CN)}_6]$contains Fe2+ with a low-spin configuration due to the strong-field ligand CN−.It is diamagnetic due to no unpaired electrons, meaning it will be repelled by a magnetic field.