Q. Heating an aqueous solution of aluminium chloride to dryness will give
A) $Al(OH)Cl_{2}$
B) $Al_{2}O_{3}$
C) $Al_{2}Cl_{6}$
D) $AlCl_{3}$
Explanation
(b)
Aqueous solution of $AlCl_{3}$ is acidic due to hydrolysis
$\ \ \ \ \ \ \ \ \ \ AlCl_{3} + 3H_{2}O \rightleftharpoons Al(OH)_{3} + 3HCl$
On strongly heating $Al(OH)_{3}$ is converted into $Al_{2}O_{3}$.
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 2Al(OH)_{3}\overset{\ \ \ \mathrm{\Delta}\ \ \ \ }{\rightarrow}Al_{2}O_{3} + 3H_{2}O$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.