METALLURGY Level 2 METALLURGY METALLURGY Level 2 OBJECTIVE

METALLURGY Level - 2 METALLURGY

METALLURGY Level - 2 OBJECTIVE QUESTIONS (LEVEL—II)

METALLURGY Level - 2 1. Use of electrolysis in the metallurgy is 1) Electroplating 2) Electro refining 3) Both (1) and (2) 4) Roasting Solution : By using electrolysis electroplating and electro refining

METALLURGY Level - 2 2. Formula of Zincite 1) Zn. O 2) Zn. S 3) Zn. CO 3 4) Zn. SO 4 Solution : Formula Zincite-Zn. O

METALLURGY Level - 2 PRINCIPLES OF EXTRACTION 3. Which of the following is an acidic refractory material 1) Calcia 2) Quartz 3) Graphite 4) Magnesite Solution : Acidic flux-Quartz

METALLURGY Level - 2 4. In blast furnace haematite is reduced to iron mainly by 1) Coke 2) H 2 gas 3) CO gas 4) Water gas Solution :

METALLURGY Level - 2 5. The froth floatation process is used for the concentration of 1) ore having low density 2) ore having magnetic nature 3) ore having high density 4) ore having water soluble gangue Solution : In froth floatation gangue is soluble in water

METALLURGY 6. known as 1) Smelting 2) Calcination 3) Self reduction 4) Sulphatizing roasting Solution : (Galena) Level - 2

METALLURGY Level - 2 7. A mixture of Haematite, coke and limestone on heating in blast furnace gives molten iron metal. This is known as 1) Smelting 2) Calcination 3) Roasting 4) Liquation Solution : Definition

METALLURGY 8. sulphide ore 1) Cu 2) Zn 3) Fe 4) Ca Solution : Level - 2

METALLURGY Level - 2 REFINING & PURIFICATION METHODS 9. Liquation process is used for the concentration of following ore 1) Stibinite 2) Tinstone 3) Limestone 4) Haematite Solution : By liquation Sb is concentrated

METALLURGY Level - 2 10. Liquation method is used to refine following crude metal 1) Silver 2) Tin 3) Mercury 4) Copper Solution : Due to low melting point

METALLURGY Level - 2 11. A metal contains, metal oxide as impurity. The method used to refine this metal is 1) Poling 2) Liquation 3) Cupellation 4) Distillation Solution : Metals are converted into metal oxides by poling

METALLURGY Level - 2 12. Which of the following metal is refined by distillation method 1) Zinc 2) Iron 3) Tin 4) Copper Solution : Low boiling metals Zn, Hg

METALLURGY Level - 2 13. Which of the following metal is refined by poling process 1) Na 2) Cu 3) Al 4) Zn Solution : Metal Cu converted into copper oxides by poling

METALLURGY Level - 2 14. Zone refining method is used for refining 1) Al 2) Ge 3) Cu 4) Fe Solution : Semiconductors are refined by zone refining

METALLURGY Level - 2 METALLURGY OF COPPER 15. In the extraction of copper the matte formed in the blast furnace contains 1) Cu 2 S + little Fe. S 2) Cu 2 S + little Fe. O 3) Cu 2 O + little Fe. S 4) Cu 2 O + little Fe. O Solution :

METALLURGY Level - 2 16. The Cu 2 O impurity present in blister copper is removed by 1) liquation 2) distillation 3) poling 4) zone refining Solution : The Cu 2 O impurity present in blister copper is removed by poling

METALLURGY Level - 2 17. In Bessemer converter Cu 2 S is converted to blister copper by 1) Self reduction 2) Reduction with coke 3) Reduction with coal gas 4) Reduction with H 2 gas Solution : (Copper glane) (98% pure = Blister Copper)

METALLURGY Level - 2 18. In the extraction of copper, metal is formed in the Bassemer converter due to reaction Solution :

METALLURGY Level - 2 19. Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like CH 4). The process X is called ……… and the metal contains impurities of Y is……. 1) X = cupellation, Y = Cu. O 2 2) X = poling, Y = Cu 2 O 3) X = poling, Y = Cu. O 4) X = cupellation, Y = Cu. O Solution :

METALLURGY Level - 2 METALLURGY OF IRON 20. In the extraction of iron from haematite, the charge used is haematite, coke and lime stone in the following weight ratio 1) 1 : 1 2) 8 : 4 : 1 3) 8 : 1 : 4 4) 1 : 4 : 8 Solution : The charge is used in Blast furnace is ore (Haematite) + coke + lime stone 8 : 4 : 1 ratio

METALLURGY Level - 2 21. In the blast furnace the reaction that occurs in the zone of heat absorption is Solution : Reduction

METALLURGY Level - 2 METALLURGY OF SILVER This reaction involves 1) Smelting 2) Leaching 3) Calcination 4) Roasting Solution : Ag extracted from Leaching

METALLURGY Level - 2 23. In the cyanide process when Na 2 S is formed with Ag 2 S, to stop the reverse reaction Na 2 S is converted finally to 1) Na 2 S 2 O 3 2) Na 2 SO 4 3) Na 2 SO 3 4) Na. NO 3 Solution :

METALLURGY Level - 2 24. In the leaching of Ag 2 S with Na. CN, a stream of air is also passed. It is because of 1) reversible nature of reaction between Ag 2 S and Na. CN 2) to oxidize Na 2 S formed into Na 2 SO 4 and sulphur 3) both (1) and (2) 4) both are not suitable Solution : Leaching process Ag is extracted

METALLURGY Level - 2 25. The anode mud in the electrolytic refining of silver contains 1) Zn, Cu, Ag, Au 2) Zn, Ag, Au 3) Cu, Ag, Au 4) Au only Solution : Impure metal oxide acts as anode

METALLURGY Level - 2 METALLURGY OF ALUMINIUM 26. Goldsmith thermite process involves in the following reaction Solution :

METALLURGY Level - 2 27. In the purification of Al by Hoope's process the correct statement is 1) electrolytic cell is iron cell and it contains three layer mass 2) upper layer is pure Al and Carbon rods in it are cathode and the bottom layer contains impure Al and carbon lining of the cell is anode 3) electrolyte is the middle layer with fused mixture of flourides of Na, Al, Ba 4) All the above Solution : This process is Hoope’s Process

METALLURGY Level - 2 28. The cathode used in the electrolytic cell during aluminium extraction is made of 1) Aluminium 2) Carbon lining 3) Iron 4) Steel Solution : Carbon lining used as a Cathode in the electrolytic cell

METALLURGY Level - 2 29. During electrolytic reduction of Alumina, the reaction at cathode is Solution : Gaining of electrons is reduction

METALLURGY Level - 2 30. Observe the following statements regarding purification of bauxite: 1) During Hall's process, silica, is removed as Si(vapour) II. Bauxite ore contaminated with Fe 2 O 3 is purified in Baeyer's process. III. During Serpeck's process, Al. N is formed The correct answer is: 1) I , II and III are correct 2) Only I and II are correct 3) Only I and III are correct 4) Only II and III are correct Solution : Silica is removes as Si (vapour) in serpeck’s process but not Hall’s process

METALLURGY Level - 2 31. In the extraction of aluminium Process X: applied for red bauxite to remove iron oxide(chief impurity) Process. Y: applied for white bauxite to remove Z(chief impurity)then, Process X and impurity Z are 1) X = Hall - Heroult’s process & Y= Si. O 2 2) X = Baeyer’s process and Y = Si. O 2 3) X = Serpeck’s process and Y= iron oxide 4) X = Baeyer’s process and Y = iron oxide Solution :

METALLURGY Solution : Level - 2

METALLURGY Level - 2 Thank you…