24158924-Question-Bank-of-Metallurgy-12-02.pdf

24158924-Question-Bank-of-Metallurgy-12-02.pdf - VIDYANCHAL...

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V I D Y A N C H A L The Pioneer Academy for IIT-JEE / PMT Coaching 12/15/2009 Topic: metallurgy Test Class: XII th Page No. ( 1 ) 1. Formation of metallic copper from the sulphide ore in the normal thermo-metallurgical process essentially involves which one of the following reaction: 2. Ag 2 S + NaCN + Zn Ag this method of extraction of Ag by complex formation and then its displacement is called: (A) Parke's method (B) McArthur-Forest method (C) Serpeck method (D) Hall's method 3. Calcination is the process of heating the ore: MgO 4. Which of the following does not contain Mg :(A) magnetite (B)magnesite (C) asbestos (D) carnallite 5. Match the method of concentration of the ore in column I with the ore in column II and select the correct alternate: 6. Bessemerisation is carried out for I : Fe, II : Cu, III : Al, IV : silver 7. Refining of silver is done by :(A) Liquation (B) poling (C) cupellation (D) van Arkel method 8. There are following extraction process of silver but not: (A) as a side product in electrolytic refining of copper (B) Parke's process in which Zn is used to extract silver by solvent extraction from molten lead (C) by reaction of silver sulphide with KCN and then reaction of soluble complex with Zn (D) by heating Na[ Ag(CN) 2 ] 9. Blister Cu is about: (A) 60% Cu (B) 90% Cu (C) 98% Cu (D) 100% Cu 10. Which one of the following is not a method of concentration of metals? (A) gravity separation (B) froth floating process (C) electromagnetic separation (D) smelting 11. In which of the following isolations no reducing agent is required: (A) iron from haematite (B) aluminium from bauxite (C) mercury from cinnabar (D) zinc from zinc blende 12. Chemical leaching is useful in the concentration of: 13. The element which could be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is: 14. Consider the following statements: Roasting is carried out to:
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