`MgCl_(2).6H_(2)O` on heating gives anhydrous `MgCl_(2)`
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KCl.MgCl_2. 6H_2O is a
Anhydrous MgCl_(2) is obatined by heating hydrate salt, MgCl_(2).6H_(2)O .
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When MgCl_(2).6H_(2)O is strongly heated, then if forms :
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. In the hydrated chloride of Mg the value of x is :
Knowledge Check
MgCl_(2).6H_(2)O when heated gives
A
Magnesium oxychloride
B
Magnesium dichloride
C
Magnesium oxide
D
Magnesium chloride
MgCl_(2). 6H_(2)O , when heated gives-
A
magnesium hydride
B
magnesium chloride
C
magnesium oxide
D
magnesium oxychloride
KCl.MgCl_2. 6H_2O is a
A
mixed salt
B
double salt
C
basic salt
D
complex salt
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