JEE Main · 2005 · 08 May 2005 · Offline · p-Block Elements

Heating an aqueous solution of aluminium chloride to dryness will give

(A) $AlCl_{3}$
(B) $Al_{2} Cl_{6}$
(C) $Al_{2} O_{3}$ ✓ Correct
(D) $Al (OH) Cl_{2}$

Answer: (C)

Solution

Aluminium chloride in water is heavily hydrolysed, and heating drives that hydrolysis to completion rather than simply boiling off dry salt. The dissolved

AlCl X_{3}

turns into

Al (OH) X_{3}

with release of

HCl

, and continued heating dehydrates the hydroxide. What is left in the dish is aluminium oxide,

Al X_{2} O X_{3}

JEE Main · 2005 · 08 May 2005 · Offline · Single correct option

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