Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl_(2) which is electrolyzed to discharge Mg. the mixture is in the ratio 35% MgCl_(2) + 50% NaCl + 15% CaCl_(2). NaCl and CaCl_(2) are added to lowr the fusion temperature and to increase the conductance. {:(Mg^(2+) + Ca(OH)_(2) rarr Mg (OH)_(2) + Ca^(2+)),(Mg(OH)_(2) + 2HCl rarr MgCl_(2) + 2H_(2)O(l)),("Electrolysis of fused" MgCl_(2) overset("Anode")rarr 2Cl^(-)rarr Cl_(2) + 2_(-1e^(0))overset("cathode")rarr Mg^(2+) + 2_(-1e^(0)) rarr Mg):} Mg electrolysed is protected from atmospheric oxidation by a blanket of inert gases. Molten mixture contains Mg^(2+), Na^(+) and Ca^(2+) but at cathode only Mg is discharged because :

Dow's process of extraction of Mg involves extraction of Mg from sea w

1.	Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl_(2) which is electrolyzed to discharge Mg. the mixture is in the ratio 35% MgCl_(2) + 50% NaCl + 15% CaCl_(2). NaCl and CaCl_(2) are added to lowr the fusion temperature and to increase the conductance. {:(Mg^(2+) + Ca(OH)_(2) rarr Mg (OH)_(2) + Ca^(2+)),(Mg(OH)_(2) + 2HCl rarr MgCl_(2) + 2H_(2)O(l)),("Electrolysis of fused" MgCl_(2) overset("Anode")rarr 2Cl^(-)rarr Cl_(2) + 2_(-1e^(0))overset("cathode")rarr Mg^(2+) + 2_(-1e^(0)) rarr Mg):} Mg electrolysed is protected from atmospheric oxidation by a blanket of inert gases. Molten mixture contains Mg^(2+), Na^(+) and Ca^(2+) but at cathode only Mg is discharged because :
Answer» standard REDUCTION potential of Mg is LEAST among the three standard oxidation potential of Mg is least among the three discharge potential of Mg is highest NONE of the above Solution :`E_("o.p.")^(o) "for Mg"^(+), Na^(+) and Ca^(2+)` are 2.37, 2.71 and 2.87 V respectively.