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 skaked lime. Magnesium hydroxide is heated in a stream of `HCI` to give `MhCi` which is electrolysed to dischate `Mg`. the mixture is in the ratio `35% MgCI_(2) +50% NaCI + 15% CaCI_(2). NaCI_(2)` and `CaCI_(2)` are added to lower the fusion temperature and to increase the conductance.
`Mg^(2+) +Ca(OH)_(2) rarr Mg (OH)_(2) +Ca^(2+)`
`Mg(OH)_(2) + 2HCI rarr MgCI_(2) +2H_(2)O` (liquid)
Electrolysis of fused `MgCI_(2) overset("Anode")rarr 2CI^(-) rarr 2_(-I)e^(@)`
`overset("Cathode")rarr Mg^(2+) +2_(-I)e^(@) rarr Mg`
Mg electrolysed is protected from atmospheric oxidation by a blanket of inert gases.
`Mg^(2+) + Ca(OH)_(2) rarr Mg(OH)_(2)darr +Ca^(2+)` This reaction indicates:

Options

A. `Mg (OH)_(2)` is weaker base than `Ca(OH)_(2)`
B. Solubility prodcucts of `Mg(OH)_(2)` is less than that of `Ca(OH)_(2)`
C. Polarising power of `Mg^(2+)` is more than that of `Ca^(2+)` ion
D. Both (B) and (C)

Answer

D