" (i) "Mg(OH)_(2)+HCl longrightarrow MgCl_(2)+H_(2)O

Balance the following equations. 3) Mg(OH)_(2)+HCl rarr MgCl_(2)+H_(2)O

Balance the following equations: (i) Na+O_(2)toNa_(2)O (ii) H_(2)O_(2)toH_(2)O+O_(2) (iii) Mg(OH)_(2)+HCl to MgCl_(2)+H_(2)O (iv) Fe+O_(2)to Fe_(2)O_(3) (v) Al(OH)_(3)toAl_(2)O_(3)+H_(2)O (vi) NH_(3)+CuOtoCu+N_(2)+H_(2)O (vii) Al_(2)(SO_(4))_(3)+NaOHto Al(OH)_(3)+Na_(2)SO_(4) (viii) HNO_(3)+Ca(OH)_(2)toCa(NO_(3))_(2)+H_(2)O (ix) NaOH+H_(2)SO_(4)toNa_(2)SO_(4)+H_(2)O (x) BaC l_(2)+H_(2)SO_(4)toBaSO_(4)+HCl

Balance the following equations and write down the stoichiometric proportions. (a) C+O_(2) to CO_(2) (b) H_(2)+Cl_(2) to HCl (c ) N_(2)+H_(2) to NH_(3) (d) Fe+O_(2) to Fe_(2)O_(3) (e ) CaCO_(3)+HCl to CaCl_(2)+H_(2)O+CO_(2) (f) MnO_(2)+HCl to MnCl_(2)+H_(2)O+Cl_(2) (g) Mg(OH)_(2)+HCl to MgCl_(2)+H_(2)O (h) KI+H_(2)SO_(4) to KHSO_(4)+I_(2)+SO_(2)

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 electrolysed to discharge Mg. The mixture is in the ratio 35% MgCl_(2)+50% NaCl+15% CaCl_(2) . NaCl and CaCl_(2) are added to lower the fusion temperature and to increases the conductance. Mg^(2+) +Ca(OH)_(2) to Mg(OH)_(2)+Ca^(2+) Mg(OH)_(2)+2HCl to MgCl_(2)+2H_(2)O(l) Electrolysis of fused MgCl_(2) hArr Mg^(2+)+2Cl Mg^(2+)+2e^(-) to Mg ( At Cathode) 2Cl^(-) to Cl_(2)+2e^(-) (At Anode) Mg electrolysed is protected from atmospheric oxidation by a blanket of inert gases. Molten mixutre of NaCl and CaCl_(2) is added to the heated MgCl_(2) because :