| Column - I | Column - II |
| (a) Hall-Heroult | (q) Molten \[A{{l}_{2}}{{O}_{3}}+N{{a}_{3}}Al{{F}_{6}}\]electrolysis |
| (b)Dow?s sea water process | (q) Molten \[MgC{{l}_{2}}+CaC{{l}_{2}}+NaCl\]electrolysis |
| (c) Hoop?s process | (r) Molten impure aluminium + fluorides of \[N{{a}^{+}},B{{a}^{2+}}\]and\[A{{l}^{3+}}\]electrolysis |
| (d) Mac-Arthur Forrest process | (s) Complex formation and displacements method |
A) a-p b-q c-r d-s
B) a-r b-q c-s d-p
C) a-q b-p c-r d-s
D) a-s b-r c-q d-p
Correct Answer: A
Solution :
[a] Hall - Heroult process is the electrolytic reduction of molten \[A{{l}_{2}}{{O}_{3}}\] dissolved in cryolite or fluorspar [b] Dow's sea water process involves the isolation of Mg from sea water as \[MgC{{l}_{2}}\] and then electrolytic reduction of molten \[MgC{{l}_{2}}\] dissolved in \[CaC{{l}_{2}}\] and NaCI. [c] Hoop's process is the electrolytic purification of impure aluminium. The cell has three liquid layers middle one contains fluorides of \[N{{a}^{+}},B{{a}^{2+}}\] and \[A{{l}^{3+}},\] lower most layer has pure Al (obtained by cathodic oxidation) [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 \[C{{N}^{-}}.\] The metal is later recovered by displacement method.
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