Answer:
Hydrated ferric chloride \[(FeC{{l}_{3}}.6{{H}_{2}}O)\]
upon heating gets hydrolysed by its own molecules of water of crystallization
to give ferric hydroxide which changes to ferric oxide on further heating.
Thus, anhydrous ferric chloride is not formed.
\[FeC{{l}_{3}}.6{{H}_{2}}O\xrightarrow{\,}\,Fe{{(OH)}_{3}}+3HCl+3{{H}_{2}}O]\times
2\]
\[2Fe{{(OH)}_{3}}\xrightarrow{\,}\,F{{e}_{2}}{{O}_{3}}+3{{H}_{2}}O\]
\[2FeC{{l}_{3}}.\,6{{H}_{2}}O\xrightarrow{\,}\,F{{e}_{2}}{{O}_{3}}+6HCl+9{{H}_{2}}O\]
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