Which of the following statements about aluminium chloride is correct?
- AAluminium chloride has a much higher melting point than magnesium chloride due to the small size of the aluminium ion.
- BAnhydrous aluminium chloride reacts vigorously with water to form a solution with a pH greater than $7$.
- CEach $\text{Al}_2\text{Cl}_6$ molecule found in aluminium chloride vapour contains two coordinate bonds.
- DThe bonding between aluminium and chlorine is strongly ionic due to the large difference in electronegativity.