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NEET 2016 Chemistry question

ChemistryGeneral Principles and Processes of Isolation of Elements (Metallurgy)NEET 2016

Not in JEE Main or NEET syllabus

Match items of column I with the items of column II and assign the correct code: Column I (a) Cyanide process (b) Froth floatation process (c) Electrolytic reduction (d) Zone refining Column II (i) Ultrapure Ge (ii) Dressing of ZnS (iii) Extraction of Al (iv) Extraction of Au (v) Purification of Ni

Answer: (1)

Solution

(a) The cyanide (MacArthur-Forrest) process leaches native gold (and silver) with dilute NaCN solution in the presence of air, so it is used for the extraction of Au: (a)-(iv). (b) Froth floatation is used to concentrate (dress) sulphide ores such as ZnS, PbS and : (b)-(ii). (c) Aluminium is

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Question ID VK-091892