First slide

Atomic and physical properties

Question

Heating an aqueous solution of aluminium chloride to dryness will give

Moderate

A

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

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

${AlCl}_{3}$
D

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

Solution

On heating ${AlCl}_{3} (aq) to dryness, {Al}_{2} O_{3}$
$2 {AlCl}_{3} + 6 H_{2} O \to 2 Al {(OH)}_{3} + 6 HCl Al {(OH)}_{3} \underset{∆}{\to} {Al}_{2} O_{3} + 3 H_{2} O$

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