Aluminium chloride exists as dimer, $Al_2Cl_6$ in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

Question

( A ) $Al_2O_3 +6HCl$
( B ) $[Al(H_2O)_6]^{3+} + 3 Cl^-$
( C ) $[Al(OH)_6]^{3-}$
( D ) $Al^{3+} + 3Cl^-$