Magnesium is a valuable, light weight metal used as a structural material as well as in alloy hatteries and in chemical s . Although magnesium is plentiful in Earth s maire found in the sea water after sodium). There is about 1.3 8 of magnesium in every kilogram of se water. The process for obtaining magnesium from en water employs all three types of reaction Le precipitation, acid-base, and redox reactions
Redox reaction takes place in the extraction of Mg :

Options

A. In the electronlytic cell when fused `MgCI_(2)` is subjected to electrolysis
B. When fused `MgCO_(3)` is heated
C. When fused `MgCO_(2)` is strongly heated
D. Both (b) and (c )

Answer

a

Explanation

When fused `MgCI_(2)` undergoes electolysis, reactions takes place at anode and cathode are At anode : (Oxidation) : `2CI^(-) rarr CI_(2(g))+2e^(-)`
At Cathode (Reduction):
`Mg^(+2) +2e^(-) rarr Mg_((s))`