Question

Which of the following is/are method(s) to prepare aluminium chloride?

• A. Passing dry $HCl$ gas over heated aluminium
• B. Heating a mixture of alumina and carbon under chlorine gas at atmospheric pressure
• C. Dissolving aluminium metal in dilute hydrochloric acid
• D. Dissolving aluminium hydroxide in dilute hydrochloric acid

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Passing dry $HCl$ gas over heated aluminium
B Heating a mixture of alumina and carbon under chlorine gas at atmospheric pressure
C Dissolving aluminium metal in dilute hydrochloric acid
D Dissolving aluminium hydroxide in dilute hydrochloric acid

The methods in option a and option b give anhydrous aluminium chloride while the methods in option c and option d give hydrated aluminium chloride ($AlC{l}_3.6H_{2}O$). Following are the reactions involved in the methods given in the options:
$2Al+6HCl\to 2AlC{l}_3+3H_2$
$A{l}_2{O}_3+3C+3C{l}_2\to 2AlC{l}_3+3CO$
$2Al+6HCl\to 2AlC{l}_3+3H_2$
$Al(OH{)}_3+3HCl\to AlC{l}_3+3H_{2}O$