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Match column $(I)$ (process) with column $(II)$ (electrolyte)
| $(I)$ (process) | $(II)$ (electrolyte) |
| $(i)$ Downs cell | $(W)$ fused $MgCl_2$ |
| $(ii)$ Dow sea water process | $(X)$ fused $(Al_2O_3+Na_3AlF_6)$ |
| $(iii)$ Hall - Heroult | $(Y)$ fused $KHF_2$ |
| $(iv)$ Moissam | $(Z)$ fused $(40\%\,NaCl\,+\,60\%\,CaCl_2)$ |
Choose the correct alternate :
$(i)-Z,\,(ii)-W,\,(iii)-X,\,(iv)-Y$
$(i)-X,\,(ii)-Y,\,(iii)-Z,\,(iv)-W$
$(i)-W,\,(ii)-Z,\,(iii)-X,\,(iv)-Y$
$(i)-W,\,(ii)-Z,\,(iii)-W,\,(iv)-Y$
Solution
($I$) In Downs cell molten $MgCl _2$ is electrolyzed, the electrolyte used in the cell is a fused mixture of $40\, \% \,NaCl$ and $60\, \% CaCl _2$.
($II$) In Dow process, $Mg ( OH )_2$ is precipitated from sea-water by slurrying with calcined dolomite and then converting it to $MgCl _2$ by reacting with $HCl$. In Dow sea water process, the electrolyte used is fused $MgCl _2$.
($III$) In the Hall-Heroult process, the electrolyte used is a fused mixture of $Al _2 O _3$ and $Na _3 AlF _6$.
($IV$) In Moissan process, the electrolyte used is fused $KHF _2$.
The correct match is: $I-Z, II-W, III-X, IV-Y$
