Question

Heating an aqueous solution of aluminium chloride to dryness will give?

• A. $AlC{l}_3$
• B. $A{l}_{2}C{l}_3$
• C. $A{l}_2{O}_3$
• D. $Al\left(OH\right)C{l}_2$

Answer 1

The correct option is C $A{l}_2{O}_3$

Aqueous solution of $AlC{l}_3$ is acidic as it gives HCL on hydrolysis.

$AlC{l}_3+3H_{2}O\to Al(OH{)}_3+HCl$
On strongly heating $Al(OH{)}_3$ is converted into $A{l}_2{O}_3$.

$Al(OH{)}_3\to A{l}_2{O}_3+3H_{2}O$

$AlC{l}_3$ on heating gives $A{l}_2{O}_3$.