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Which of the following statements is correct ? (i) Copper is extracted by hydrometallury from low grade ores. (ii) In electrolytic reduction of alumina , graphite is acting as anode and steel vessel with lining of carbon acts as cathode. (iii) In Hall-Heroult process, aluminium is obtained at anode and CO and `CO_(2)` are produce at cathodeA. (i) onlyB. (i) and (ii) onlyC. (ii) and (iii) onlyD. All of these |
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Answer» Correct Answer - B In Hall-Heroult process, At cathode : `Al_("(melt)")^(3+)+ 3e^(-) to Al_((l))` At anode : `C_((s)) + O_("(melt)")^(2-) to CO_(2(g)) + 4e^(-)` `C_((s)) + 2O_("(melt)")^(2-) to CO_(2(g)) + 4e^(-)` |
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