Question

Anhydrous ferric chloride is prepared by:

• A. Heating hydrated ferric chloride at a high temperature in a stream of air.
• B. Heating metallic iron in a stream of dry chlorine gas.
• C. Reaction of ferric oxide with HCl (aq).
• D. Reaction of metallic iron with HCl (aq).

Answer 1

Answer: (B)

$(1)$ On heating we get ${\text{FeCl}}_{\text{2}}$ and ${\text{Cl}}_{\text{2}}$
$\left(\text{2}\right)\text{2Fe}+{\left(\text{3Cl}\right)}_{\text{2}}\to {\left(\text{2FeCl}\right)}_{\text{3}}$ (anhydrous);

$\left(\text{3}\right)\text{,}\left(\text{4}\right)$ do not give anhydrous $FeC{l}_3$ but give hydrated $FeC{l}_3$ .