Question

If a person is asked to prepare the blue print of a building plan, he can use:

• A. $FeC{l}_3+K_4\left[Fe\right(CN{)}_6]$
• B. $FeC{l}_2+K_3\left[Fe\right(CN{)}_6]$
• C. $FeC{l}_2+K_4\left[Fe\right(CN{)}_6]$
• D. $Fe\left(Ct\right)+K_3\left[Fe\right(CN{)}_6]$ where $Ct$ is citrate

Answer 1

The correct option is A $FeC{l}_3+K_4\left[Fe\right(CN{)}_6]$

Ferric chloride reacts with potassium ferrocyanide to form a complex purssian blue.
$4FeC{l}_3+3K_4\left[Fe\right(CN{)}_6]\to F{e}_4[Fe(CN{)}_6{]}_3+12KCl$
Hence, if a person is asked to prepare the blue print of a building plan, he can use $FeC{l}_3+K_4\left[Fe\right(CN{)}_6]$.