तीन फॅरेडे वीज वितळलेल्या `Al_2O_3` च्या जलीय द्रावणातून `CuSO_4` आणि

Al_(2)O_(3) reacts with

Three faradays of electricity are passed through molten Al_2O_3 aqueous solution of CuSO_4 and molten NaCl taken in deffernt electrolytic cells. The amout of Al,Cu and Na deposited at the cathodes will be in the ration of .