(i) Carbon cannot be used as reducing agent to obtain Mg from MgO. Why ? (ii) How is sodium obtained from molten sodium chloride ? Give equations of the reactions. (iii) How is copper obtained from its sulphide ore ? Give equations of the reactions.

(i) Carbon cannot be used as reducing agent to obtain Mg from MgO. Why

1.	(i) Carbon cannot be used as reducing agent to obtain Mg from MgO. Why ? (ii) How is sodium obtained from molten sodium chloride ? Give equations of the reactions. (iii) How is copper obtained from its sulphide ore ? Give equations of the reactions.
Answer» Solution :(i) MG has more affinity for oxygen than CARBON. (II) Electrolytic reduction process of molten NaCl. At cathode : `2Na^(+) + 2e^(-) rarr 2Na` At anode : `2Cl^(-) rarr Cl_(2) + 2e` (III) `2Cu_(2)S + 3O_(2) rarr 2Cu_(2)O + 2SO_(2)` `2Cu_(2)O + Cu_(2)S rarr 6Cu + SO_(2)`