MetallurgyHard

Question

Magnesium is extracted by electrolysing fused magnesium chloride containing NaCl & CaCl2 using :

Options

A.a nickel cathode and a graphite anode.
B.the iron container as anode and a nickel cathode.
C.the iron container as cathode and a graphite rod as anode.
D.the nickel container as cathode and iron anode.

Solution


MgCl2  ⇋  Mg2+ + 2Cl-
At cathode :  Mg2+ + 2e- → Mg(99% pure) ;
At anode  : 2Cl- → Cl2 + 2e-

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