Question

Both potassium ferrocyanide and potassium ferricyanide are diamagnetic.

• A. True
• B. False

Answer 1

The correct option is B False

Potassium ferrocyanide is $K_4\left[Fe\right(CN{)}_6]$. It contains $F{e}^{2+}$ ions with $3d^6$ outer electronic configuration. Since cyanide is strong field ligand, all 3d electrons will be paired. Hence, potassium ferrocyanide will be diamagnetic.
Potassium ferricyanide is $K_3\left[Fe\right(CN{)}_6]$. It contains $F{e}^{3+}$ ions with $3d^5$ outer electronic configuration. Cyanide is a strong field ligand, so spin pairing will be favored. One 3d electron will remain unpaired. Hence, potassium ferricyanide will be paramagnetic.

Hence, the given statement is false.