MetallurgyMedium

Question

The following flow diagram represents the extraction of magnesium from sea water.
Sea water Mg(OH)2 MgCl2 + H2O
                                                                                 ↓ crystallisation
Magnesium Anhydrous MgCl2 (r)
Which of the following option describes the correct reactants, products and reaction conditions ?

Options

A.(p) → Milk of magnesia
(q) → HCl(aq.)
(r) → MgCl2.2H2O
(s) → Heating in limited supply of air
(t) → Reduction by coke.
B.(p) → Lime water
(q) → HCl(aq.)
(r) → MgCl2
(s) → Heating in absence of air
(t) → Electrolytic reduction in molten state.
C.(p) → Milk of lime
(q) → HCl(aq.)
(r) → MgCl2.6H2O
(s) → Heating in presence of dry HCl
(t) → Electrolytic reduction in molten state.
D.(p) → Milk of lime
(q) → HCl(aq.)
(r) → MgCl2.6H2O
(s) → Heating in presence of dry HCl
(t) → Electrolysis of aqueous solution

Solution

MgCl2 + Ca(OH)2(p) → Mg(OH)2 ↓ + HCl(q) → MgCl2 + H2O MgCl2.6H2O (r)
                                                                            

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