MCQ
Heating an aqueous solution of aluminium chloride to dryness will give:
- A$AlCl_3$
- B$Al_2Cl_6$
- ✓$Al_2O_3$
- D$Al(OH)Cl_2$
✓
Answer
Correct option: C.
$Al_2O_3$
c
Aqueous solution of $\mathrm{AlCl}_{3}$ is acidic as it gives $\mathrm{HCL}$ on hydrolysis.
Aqueous solution of $\mathrm{AlCl}_{3}$ is acidic as it gives $\mathrm{HCL}$ on hydrolysis.
$\mathrm{AlCl}_{3}+3 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Al}(\mathrm{OH})_{3}+\mathrm{HCl}$
On strongly heating $\mathrm{Al}(\mathrm{OH})_{3}$ is converted into $\mathrm{Al}_{2} \mathrm{O}_{3}$
$\mathrm{Al}(\mathrm{OH})_{3} \rightarrow \mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{H}_{2} \mathrm{O}$
$\mathrm{AlCl}_{3}$ on heating gives $\mathrm{Al}_{2} \mathrm{O}_{3}$
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