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  4. Heating an aqueous solution of aluminium chloride to dryness will give

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Q. Heating an aqueous solution of aluminium chloride to dryness will give

Solution:

The solution of aluminium chloride in water is acidic due to hydrolysis.
$AlCI_3 + 3H_2O \rightarrow Al(OH)_3 +3HCl - $
On heating it till dryness $Al(OH)_3$ is converted into $AI_2O_3$
$\ce{2AI(OH)_3 ->[\Delta] A/i_2 O_3 + 3H_2O}$