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Electrolytic reduction of alumina to aluminum by the Hall-Heroult process is carried outA. in the presence of cryolin which forms a melt at hight temprature process is carride outB. In the presents of `NaCI`C. In the presence of thaoriteD. in the presence of cryyolte which a mell at lower temprature and increases the electrical conductivity. |
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Answer» Correct Answer - d Fused aluminum `(Al_(2)O_(3))` is a had conductor of electricity .Therefore crystable `(NaAIF_(2))` and flotspar `(CaF_(2))~ are added is perified `AI_(2)O_(3)` which not only make stamone a good conductor of electricity but also reduce the melting point of the rain to around `1140 K` The processof obtaiting AI by electrodrsis of a mixture of paralified `AI_(2)O_(3) and NaAIF_(2) ` called half and hevoids process |
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