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Anhydrous aluminium chloride cannot be p...

Anhydrous aluminium chloride cannot be prepared by heating hydrated aluminium chloride. Why?

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When hydrated aluminium chloride `(AlCl_3. 6H_2O)` is heated, it gets hydrolysed by the water of crystallisation and aluminium oxide is formed. Therefore, anhydrous aluminium chloride cannot be prepared by heating hydrated aluminium chloride.
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