C-10-Q030mediumsingle_mcqBauxite has the formula—aAl2O3⋅2H2O\mathrm{Al_2O_3 \cdot 2H_2O}Al2O3⋅2H2ObNa3AlF6\mathrm{Na_3AlF_6}Na3AlF6cAl2(SO4)3\mathrm{Al_2(SO_4)_3}Al2(SO4)3dAlCl3\mathrm{AlCl_3}AlCl3