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Mg(OH)(2)darr+2HCl to MgCl(2)+2H(2)O...

`Mg(OH)_(2)darr+2HCl to MgCl_(2)+2H_(2)O`

A

For precipitate formation reaction

B

For precipitate dissolution reaction

C

For precipitate exchange reaction

D

For no reaction

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The correct Answer is:
b
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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 :

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 mixture contains Mg^(2+), Na^(+) and Ca^(2+) but at cathode only Mg^(2+) is discharged because :

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

Mg(OH)_(2) +2HCI rarr MgCI_(2) +2H_(2)O In this reaction, the equivalent weight of Mg(OH)_(2) is

Mg(s)+2HCl to MgCl_(2)+H_(2)

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