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. Mg^(2+) + Ca (OH)_(2) rarr Mg(OH)_(2) darr + Ca^(2+) This reaction indicates :

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. Mg^(2+) + Ca (OH)_(2) rarr Mg(OH)_(2) darr + Ca^(2+) This reaction indicates :
Answer» `Mg(OH)_(2)` is weaker base than `Ca(OH)_(2)` SOLUBILITY product of `Mg(OH)_(2)` is less than that of `Ca(OH)_(2)` POLARISING POWER of `Mg^(2+)` is more than that of `Ca^(2+)` ion Both (B) and (C) Answer :D