InterviewSolution
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InterviewSolution
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Match items of Column I with the items of Column II and assign the correct code: `{:(ColumnI,ColumnII),((A)"Cyanide process",(1)"Ultrapure Ge"),((B)"Froth Floatation Process",(2)"Dressing of"ZnS),((C)"Electrolytic reduction",(3)"Extraction of Al"),((D)"Zone refining",(4)"Extraction of Au"),(,(5)"Purification of Ni"):}`A. `{:("A","B","C","D"),(2,3,1,5):}`B. `{:("A","B","C","D"),(1,2,3,4):}`C. `{:("A","B","C","D"),(3,4,5,1):}`D. `{:("A","B","C","D"),(4,2,3,1):}` |
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Answer» Correct Answer - D A - 4, B - 2, C - 3, D - 1 • Cyanide process It is a metallurgical technique for extracting Au (gold) from low grade ore by converting the Au to a water-soluble coordination complex. • Froth floatation process This process is used for dressing of sulphide ore, i.e. ZnS. • Electrolytic reduction This process is used for extraction of Al which is carried out in a steel tank lined inside with graphite. Here, graphite serves as cathode. The electrolyte consists of alumina dissolved in fused cryolite `(Na_(3)AlF_(6))` and fluorspar `(CaF_(2))`. • Zone refining This process is used for ultra pure Ge element An ingot of Ge is first purified by zone refining. Then a small amount of antimony is placed in the molten zone which is passed through the pure Ge with the proper choice of rate of heating and other variables. |
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