Anhydrous ferric chloride is prepared by:

Options

A. dissolving ferric hydroxide in dilute `HCl`
B. dissolving ferric hydroxide in concentrated `HCl`
C. by passing dry `Cl_(2)` gas over heated scrap iron
D. by dissolving iron(III) oxide in concentrated `HCl`.

Answer

C

Explanation

(A),(B) and (D) given hydrated `FeCl_(3)` ahnd (C ) yield anhydrous `FeCl_(3)` according to the reaction,
`2Fe+3Cl_(2) undersetto(Delta) 2FeCl_(3)("anhydrous")`.