Anhydrous $\mathrm{AlCl}_{3}$ cannot be obtained from which of the following reactions?

Anhydrous $\mathrm{AlCl}_{3}$ cannot be obtained from which of the following reactions?
  1. Heating $\mathrm{AlCl}_{3} \cdot 6 \mathrm{H}_{2} \mathrm{O}$
  2. By passing dry $H \mathrm{Cl}$ over hot aluminium powder
  3. By passing dry $\mathrm{Cl}_{2}$ over hot aluminium powder
  4. By passing dry $\mathrm{Cl}_{2}$ over a hot mixture of alumina and coke

Solution

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Asked in: JEE-TOPICTESTS-CHEMISTRY

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