Match the name of the processes given in column-I with type(s) of metallurgical methods given in column-II .
Column – I | Column – II | ||
(P) | Hall–Heroult process | (a) | Molten Al2O3 + Na3AlF6 electrolysis. |
(Q) | Dow’s sea water process | (b) | Molten MgCl2 + CaCl2 + NaCl electrolysis. |
(R) | Hoop’s process | (c) | Molten impure aluminium + fluorides of Na+, Ba2+ and Al3+ electrolysis. |
(S) | Mac-Arthur Forrest process | (d) | Complex formation and displacement method. |
Code
P Q R S
Text Solution
Verified by ExpertsD
Hall- Heroult process is the electrolytic reduction of molten Al 2 O 3 dissolved in cryolite or fluorspar.
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.
Hoop's process is the electrolytic purification of impure aluminium. The cell has three liquid layers upper most layer containts impure Al, middle one contains fluorides of Na + , Ba 2+ and Al 3+ , lower most layer has pure Al (obtained by cathodic oxidation).
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.
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