Can $Al_2O_3$ be converted into anhydrous $AlCl_3$ by heating? When?
- ABy heating with $NaCl$ in the solid state.
- BBy heating a mixture of $Al_2O_3$ and carbon in a stream of dry chlorine gas.
- CBy heating $Al_2O_3$ with $Cl_2$ gas.
- DBy heating $Al_2O_3$ with $HCl$ gas.
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