Match the name of the processes given in column-I with type of metallurgical methods given in column-II.
`{:("Column-I","Column-II"),((a)"Hall-Heroult process",(p)"Molten" Al_2O_3+Na_3AIF_6 "electrolysis"),((b)"Dow's sea water process",(q)"Molten" MgCl_2+CaCl_2+NaCl "electrolysis"),((c)"Hoop's process",(r)"Molten impure aluminium + fluorides of" Na^+, Ba^(2+) and Al^(3+) "electrolysis"),((d)"Mac-Arthur Forrest process",(s)"Complex formation and displacement method"):}`

Answer

A

Explanation

(a)Half-Heroult process is the electrolytic reduction of molten `Al_2O_3` dissolved in cryolite or fluorspar.
(b)Dow's sea water process involves the isolation of Mg from sea water as `MgCl_2` and then electrolytic reduction of molten `MgCl_2` dissolved in `CaCl_2` and NaCl.
(c)Hoop's process is the electrolytic purification of impure aluminium.The cell has three liquid layers middle one contains fluorides of `Na^(+),Ba^(2+), and Al^(3+)`, lower most layer has impure Al.
(d)Mac-Arthur forest cyanide process is the process used for the extraction of gold and silver.Extraction of gold and silver involves leaching the metal with `CN^(-)` .the metal is later recovered by displacement method.