Oxidation state of Al in given compound x+(−1)+5(0)=+2 Therefore, (x)=+3 In aqueous solution, the water molecules are just interacting electrostatically and not actually bonding. Their partially negative end is pulled by aluminium (+3) oxidation state in an ion-dipole interaction. Cl−is similarly pulled by Al(+3) oxidation state. While covalency is 6 because 6 coordinate bonds are formed (5byH2O and 1byCl−). Hence, the oxidation state and covalency of [AlCl(H2O)5]2+ are +3 and 6 respectively.