First slide

13th group or boron group

Question

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

Moderate

A

$Al (OH) {Cl}_{2}$
B

${Al}_{2} O_{3}$
C

${Al}_{2} {Cl}_{6}$
D

${AlCl}_{3}$

Solution

The solution of Aluminium chloride in water is acidic due to Hydrolysis
${AlCl}_{3} + 3 H_{2} O \to Al (OH)_{3} + 3 HCl$
$On heating it till dryness Al (OH)_{3} is converted into {Al}_{2} O_{3}$
$Al (OH)_{3} \overset{Δ}{⟶} {Al}_{2} O_{3} + 3 H_{2} O$

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