METALLURGY Level 1 METALLURGY METALLURGY Level 1 OBJECTIVE
METALLURGY Level - 1 METALLURGY
METALLURGY Level - 1 OBJECTIVE QUESTIONS (LEVEL—I)
METALLURGY Level - 1 1. The most abundant metal on the surface of the earth is…. 1) Fe 2) Al 3) Ca 4) Na Solution :
METALLURGY Level - 1 2. The most abundant element in the earth’s crust (by weight) is 1) Si 2) Al 3) O 4) Fe Solution :
METALLURGY Level - 1 3. Most of the metals which occur in native state 1) are very reactive 2) have low density 3) can form silicates readily 4) are not reactive Solution : Due to less reactive
METALLURGY Level - 1 4. Which of the following metal occurs in native state 1) Ca 2) Au 3) Zn 4) Al Solution : Less reactive
METALLURGY Level - 1 5. The natural materials from which an element can be extracted economically are called 1) Ores 2) Minerals 3) Gangue 4) flux
METALLURGY Level - 1 6. The earthy impurities present in the mineral are called 1) flux 2) slag 3) gangue 4) refractory material
METALLURGY Level - 1 7. During smelting, an additional substance is added which combines with impurities to form a fusible product. That addition substance is known as…. 1) Slag 2) Mud 3) Gangue 4) Flux
METALLURGY Level - 1 8. In metallurgy, flux is a substance used to convert 1) insoluble impurities to a fusible mass 2) minerals into silicates 3) soluble particules in to insoluble particles 4) fusible impurities to infusible impurities Solution : Insoluble impurities to a fusible mass
METALLURGY Level - 1 9. In metallurgical processes, the flux used for removing acidic impurities is 1) Silica 2) Sodium chloride 3) Limestone 4) Sodium carbonate Solution : Ca. CO 3 Ca. O is a basic flux Ca. O + CO 2
METALLURGY Level - 1 10. When a metal is to be extracted from its ore and the gangue associated with the ore is silica, then 1) An acidic flux is added 2) A basic flux is added 3) Both acidic and basic fluxes are added 4) Neither of them is needed Solution : Ca. O is a basic flux
METALLURGY Level - 1 11. Which of the following is not a basic flux ? 1) Ca. CO 3 2) Lime 3) Si. O 2 4) Ca. O Solution : Si. O 2 acidic flux
METALLURGY Level - 1 ORES & MINERALS 12. An example of an oxide ore is 1) Bauxite 2) Malachite 3) Zinc blende 4) Feldspar Solution : Al 2 O 32 H 2 O (Aluminium oxide)
METALLURGY 13. An example of halide ore is 1) Galena 2) Bauxite 3) Cinnabar 4) Cryolite Solution : Na 3 Al. F 6 Level - 1
METALLURGY Level - 1 14. Which of the following is not a carbonate mineral 1) Siderite 2) Calamine 3) Lime stone 4) Fluorspar Solution : Ca. F 2 (Fluorspar)
METALLURGY Level - 1 15. Which of the following is not a mineral of calcium. 1) Limestone 2) Fluorspar 3) Gypsum 4) Argentite Solution : Ag 2 S (Argentite)
METALLURGY Level - 1 16. Which of the following is a hydrated oxide mineral 1) Zincite 2) Cassiterite 3) Bauxite 4) Hematite Solution : Al 2 O 32 H 2 O (Bauxite)
METALLURGY Level - 1 17. Which of the following is a basic carbonate mineral i) Malachite ii) Bauxite iii) Azurite iv) Celestite 1) Both i & iii 2) Both ii & iv 3) Both i & iv 4) Both iii & iv Solution : Cu. CO 3. Cu(OH)2 (Malachite) Cu 3(CO 3)2(OH)2 (Azurite)
METALLURGY Level - 1 18. Which of the following metal cannot occur in native state? 1) Cu 2) Zn 3) Ag 4) Pt Solution : Due to more reactive.
METALLURGY Level - 1 PRINCIPLES OF EXTRACTION OF METALS 19. Method used for the concentration of tinstone ore is 1) Hand picking 2) Froth floatation 3) Magnetic separation 4) Leaching Solution : Concept of ore concentration
METALLURGY Level - 1 20. The sulphide ores are generally concentrated by 1) Gravity separation 2) Froth floatation process 3) Magnetic separation 4) Liquation Solution : Sulphide ores are generally concentrated by Froth floatation process
METALLURGY Level - 1 21. Froth floatation process is based on : 1) Wetting properties of ore particle 2) Specific gravity of ore particles 3) Magnetic properties of ore particles 4) Electrical properties of ore particles. Solution : Froth floatation process is based on Wetting properties of ore particle
METALLURGY Level - 1 22. In the froth floatation process of concentration of ores, the ore particles float because they : 1) Are light 2) Are insoluble 3) Have the surface which is not wetted easily 4) Have a constant electrical charge Solution : In the froth floatation process of concentration of ores, the ore particles float because they Have the surface which is not wetted easily
METALLURGY Level - 1 23. The oil used in the froth floatation method for the purification of ores is 1) Coconut oil 2) Kerosene oil 3) Mustard oil 4) Pine oil Solution : Oilve oil or pine oil
METALLURGY Level - 1 24. In froth floatation method froth stabilizer is 1) pine oil 2) fatty acids 3) xanthate 4) aniline Solution : aniline
METALLURGY Level - 1 25. The olive oil used in froth floatation process is called 1) Frothing agent 2) Stabilizer 3) Conditioning agent 4) Lubricating agent Solution : Definition
METALLURGY Level - 1 26. The collecting agent in froth floatation process is 1) Sodium ethyl xanthate 2) Kerosene 3) Lime 4) Water Solution : The collecting agent in froth floatation process is Sodium ethyl xanthate
METALLURGY Level - 1 27. For which ore of the metal, froth floatation method is used for concentration? 1) Cuprite 2) Bauxite 3) copper glance 4) Hematite Solution : Cu 2 S (Copper glance)
METALLURGY Level - 1 28. Which one of the following ores is best concentrated by froth-floatation method ? 1) Galena 2) Cassiterite 3) Magnetite 4) Malachite Solution : Pb. S (Galena)
METALLURGY Level - 1 29. An ore of tin containing Fe. Cr. O 4 is concentrated by 1) magnetic separation 2) froth floatation 3) electrostatic method 4) liquation Solution : Fe. Cr. O 4 has Magnetic nature
METALLURGY Level - 1 30. The magnetic impurity present in cassiterite ore is 1) Silica 2) Wolframite 4) Clay Solution : (Fe, Mn)WO 4 (Wolframite) Cassiterite contains iron as impurity
METALLURGY Level - 1 31. Electromagnetic separation is used in the concentration of 1) Copper pyrites 2) Bauxite 3) Cassiterite 4) Cinnabar Solution : Sn. O 2 (Cassiterite)
METALLURGY Level - 1 32. Heating of ore in the absence of air below its melting point is called 1) Leaching 2) Roasting 3) Smelting 4) Calcination Solution : Definition
METALLURGY Level - 1 33. The role of calcination in metallurgical operations is 1) to remove moisture 2) to decompose carbonate 3) to drive off organic matter 4) all the above Solution : Calcination process is carried out by absence of air
METALLURGY Level - 1 34. Calcination is carried out in a 1) Blast furnace 2) Electric furnace 3) Bessemer convertor 4) Reverberatory furnace Solution : Calcination is carried out in a Reverberatory furnace
METALLURGY Level - 1 35. Which of the following reactions is an example for calcination process ? Solution : Carbonates undergoes calcination
METALLURGY Level - 1 36. Heating of metal pyrites to convert them into oxides of metal in the presence of air is called 1) Smelting 2) Calcination 3) Liquation 4) Roasting Solution : Definition
METALLURGY 37. Roasting is generally done in case of 1) Oxide ores 2) Silicate ores 3) Sulphide ores 4) Carbonate ores Solution : Pb. S (Galena) Level - 1
METALLURGY Level - 1 38. The process of converting hydrated alumina into anhydrous alumina is called 1) Roasting 2) Smelting 3) Dressing 4) Calcination Solution : Definition
METALLURGY Level - 1 39. The extraction of metal from the ore is 1) an oxidation process 2) a reduction process 3) a hydration process 4) a neutralisation process Solution : Reduction
METALLURGY Level - 1 40. Carbon cannot be used to reduce 1) Zn. O 2) Sn. O 2 3) Fe 2 O 3 4) Al 2 O 3 Solution : Except Al 2 O 3 remaining ores under goes reduction by Carbon
METALLURGY Level - 1 41. Carbon is used as a reducing agent in the extraction of 1) Cr 2) Cu 3) Ag 4) Zn Solution : Zn. O + C �CO + Zn
METALLURGY Level - 1 42. Hydro metallurgy is used in the extraction of 1) Cu 2) Al 3) Mg 4) Na Solution : Hydro metallurgy is used in the extraction of Cu
METALLURGY Level - 1 43. The weakest reducing agent among the following is 1) Hydrogen Gas 2) Coke 3) Carbon monoxide gas 4) Aluminium metal Solution : Hydrogen Gas is a weakest reducing agent
METALLURGY Level - 1 44. Leaching process is one stage in the metallurgy of 1) Zinc 2) Iron 3) Aluminium 4) Copper Solution : Leaching process is used to extract Aluminium
METALLURGY Level - 1 45. The common method of extraction of metals from oxide ores is 1) Reduction with carbon 2) Reduction with hydrogen 3) Reduction with aluminum 4) Electrolytic method Solution : Reduction with carbon is general method of extraction of metals from oxide ores
METALLURGY Level - 1 46. The most electropositive metals are isolated from their ores by 1) High temperature reduction with carbon 2) Self reduction 3) Thermal decomposition 4) Electrolysis of their fused ionic salts Solution : Electrolysis process
METALLURGY Level - 1 47. Which of the following metals is obtained by electrolytic reduction process ? 1) Fe 2) Cu 3) Zn 4) Al Solution : 2 Al 2 O 3 + 3 C � 4 Al + 3 CO 2
METALLURGY Level - 1 48. Which one of the following metals is extracted by the electro metallurgical method ? 1) Cu 2) Fe 3) Na 4) Ag Solution : Cupper metal is extracted by the electro metallurgical method
METALLURGY Level - 1 49. Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is Solution : Ca. O, K 2 O cannot be reduced by carbon
METALLURGY Level - 1 50. Which of the following metals cannot be extracted by carbon reduction process ? 1) Pb 2) Al 3) Hg 4) Zn Solution : In electrolysis process aluminum is extracted
METALLURGY Level - 1 51. In electro-refining of metal the impure metal is made the anode and a strip of pure metal, the cathode, during the electrolysis of an aqueous solution of a complex metal salt. This method can not be used for refining of 1) Silver 2) Copper 3) Aluminum 4) Sodium Solution : Except sodium remaining metals are extracted.
METALLURGY Level - 1 52. In blast furnace, iron oxide is reduced by 1) Silica 2) CO 3) C 4) Limestone Solution : Fe 3 O 4 + 4 CO � 3 Fe + 4 CO 2
METALLURGY Level - 1 53. flux which can be used during smelting is 2) Ca. CO 3 3) dil HCl 4) Ca. O and Si. O 2 Solution : Basic impurities are removed by acidic flux like Si. O 2
METALLURGY Level - 1 54. Purest form of iron is 1) Cast iron 2) Hard steel 3) Stainless steel 4) Wrought iron Solution : Purest form of iron is Wrought iron (Fe)
METALLURGY 55. Slag is 1) flux and coke 2) metal and flux 3) coke and metal oxide 4) flux and impurities Solution : Gangue + flux �slag Level - 1
METALLURGY Level - 1 56. Which of the following relations is correct? 1) Gangue + Flux = Slag 2) Gangue + Slag = Flux 3) Slag + Flux = Gangue 4) All are correct Solution : Gangue + flux �slag
METALLURGY Level - 1 57. Specific gravity of slag is 1) same as molten metal 2) always greater than molten metal 3) always less than molten metal 4) may be greater or less depending upon the nature of the metal Solution : Specific gravity of slag is always less than molten metal.
METALLURGY Level - 1 58. The smelting of iron in a blast furnace involves all the steps except 1) Fusion 2) Reduction 3) Sublimation 4) Decomposition Solution : Iron is a non sublimate compound.
METALLURGY Level - 1 REFINING & PURIFICATION METHODS 59. In metallurgical process Coke is chiefly used as 1) flux 2) reducing agent 3) slag 4) oxidizing agent Solution : Coke is a reducing agent
METALLURGY Level - 1 60. The method for the purification of impure metals which is based upon the phenomenon of electrolysis is called 1) Electro refining 2) Hydrometallurgy 3) Poling 4) Liquation Solution : Definition
METALLURGY Level - 1 61. Liquation can be used for refining of 1) Copper 2) Tin 3) Zinc 4) All metals Solution : Low melting point metal tin
METALLURGY Level - 1 62. Smelting is the process of reduction of metal oxide by 1) C 2) Al 3) H 4) CO Solution : Carbon acts as a reducing agent
METALLURGY Level - 1 METALLURGY OF COPPER 63. Malachite is an ore of 1) Iron 2) Copper 3) Mercury 4) Zinc Solution : Cu. CO 3. Cu(OH)2
METALLURGY Level - 1 64. From the following which one is Fool’s gold 1) Zn. O 2) Ag. Cl Solution :
METALLURGY Level - 1 65. Copper pyrite, the chief ore of copper, is chemically 1) Cu 2 S 2) Cu. Fe. S 2 3) Cu. CO 3. Cu(OH)2 4) Cu 2 O Solution : Formula of copper pyrite Cu. Fe. S 2
METALLURGY Level - 1 66. The copper metal is extracted from its 1) Carbonate ore 2) Sulphide ore 3) Sulphate ore 4) Chloride ore Solution :
METALLURGY 67. Copper matte is a molten mixture of Solution : Level - 1
METALLURGY Level - 1 68. After partial roasting the sulphide of copper reduced by 1) Cyanide process 2) Electrolysis 3) Reduction with carbon 4) Self reduction Solution : After partial roasting the sulphide of copper reduced by Self reduction
METALLURGY Level - 1 69. In the extraction of copper, the slag formed in the blast furnace is Solution :
METALLURGY Level - 1 70. 100% copper is obtained from crude copper by 1) Zone refining method 2) Electro refining 3) Liquation 4) Poling Solution : 100% copper is obtained from crude copper by Electro refining
METALLURGY Level - 1 71. Blister copper is 1) Pure copper 2) Alloy of copper 3) Copper containing some impurity 4) Ore of copper Solution : Blister copper is 98% pure copper
METALLURGY Level - 1 72. The impurity present in Blister copper is 1) Fe. S 4) Fe. O Solution : In Blister copper Cu 2 O as a impurity
METALLURGY Level - 1 73. In electro refining of copper, pure copper is obtained 1) at cathode 2) at anode 3) in the electrolyte 4) in anode mud Solution : Concept of electro refining
METALLURGY Level - 1 METALLURGY OF ZINC 74. The formula of calamine ore is 1) Zn. S Solution :
METALLURGY 75. Commercial zinc is refined by 1) liquation 2) poling 3) electrolysis 4) amalgamation Solution : Electrolysis process Level - 1
METALLURGY Level - 1 76. Spelter is 1) Impure Cu 2) Impure Zn 3) Zn. O 4) Cu. O Solution : Impure form of Zn is spelter
METALLURGY 77. The important oxide ore of iron is 1) Siderite 2) Haematite 3) Pyrites 4) Bauxite Solution : Haematite (Fe 2 O 3 ) Level - 1
METALLURGY 78. The magnetic oxide of iron is 1) Haematite 2) Magnetite 3) Siderite 4) Limonite Solution : Magnetite (Fe 3 O 4) Level - 1
METALLURGY Level - 1 79. Which of the following is not an ore of iron ? 1) Magnetite 2) Siderite 3) Cerrusite 4) Limonite Solution : Except Cerrusite remaining ores contain iron
METALLURGY Level - 1 80. Iron is obtained on large scale from Fe 2 O 3 by 1) Reduction with CO 2) Reduction with Al 3) Calcination 4) Passing H 2 Solution :
METALLURGY Level - 1 81. Before introducing Fe. O in blast furnace, it is converted to Fe 2 O 3 by roasting so that 1) It may not be removed as slag with silica 2) It may not evaporate in the furnace 3) Presence of it may increase the m. pt. of charge 4) None Solution :
METALLURGY Level - 1 82. The flux used in the extraction of iron from haematite in the blast furnace is 1) Silica 2) Limestone 3) Calcium phosphate 4) PCl 5 Solution : Ca. O + Si. O 2 � Ca. Si. O 3
METALLURGY Level - 1 83. In the metallurgy of iron, when limestone is added to blast furnace, the calcium ion ends up in 1) Calcium carbonate 2) Metallic calcium 3) Gangue 4) Slag Solution : Fe. O+Si. O 2�Fe. Si. O 3 (slag)
METALLURGY Level - 1 84. During the extraction of iron, the slag formed is. 1) CO 2) Fe. Si. O 3 3) Mg. Si. O 3 4) Ca. Si. O 3 Solution :
METALLURGY Level - 1 85. Heating of iron pyrites in air to remove sulphur is called 1) Calcination 2) Fluxing 3) Smelting 4) Roasting Solution : Definition
METALLURGY Level - 1 86. The main reducing agent in the extraction of iron by blast furnace is 1) CO 2 2) CO 3) C 4) Coke Solution : Fe. O+CO�Fe+CO 2
METALLURGY Level - 1 87. Iron is extracted from magnetite by reduction with 1) C 2) Mg 3) Al 4) H 2 Solution :
METALLURGY Level - 1 88. Iron obtained from blast furnace is known as 1) wrought iron 2) cast iron 3) pig iron 4) steel Solution : Definition
METALLURGY Level - 1 89. The most impure form of iron is 1) Wrought iron 2) Mild steel 3) Hard steel 4) Cast iron Solution : Cast iron contains 4% carbon as impurity
METALLURGY Level - 1 METALLURGY OF SILVER 90. Silver is displaced when zinc is added to aqueous sodium argento cyanide This method of extracting silver is an example for 1) Leaching 2) Hydro metallurgy 3) Pyro metallurgy 4) Liquation Solution : (Hydrometallurgy)
METALLURGY Level - 1 91. Horn silver ore is leached with aqueous Na. CN solution. The product formed is 1) Silver metal 2) Silver chloride 3) Silver cyanide 4) Sodium argento cyanide Solution : (Sodium Argento cyanide)
METALLURGY 1) Zn 2) Al 3) Ca 4) All Solution : Level - 1
METALLURGY Level - 1 METALLURGY OF ALUMINIUM 93. The ore of aluminium is 1) Cryolite 2) Magnesite 3) Carnallite 4) Bauxite Solution : Formula of Bauxite is Al 2 O 32 H 2 O
METALLURGY Level - 1 94. Which is not a mineral of aluminum 1) Anhydrite 2) Bauxite 3) Corundum 4) Diaspore Solution : Except anhydrite (Ca. SO 4) all are minerals of aluminum.
METALLURGY Level - 1 95. The chief ore of aluminum from which Aluminum is extracted 1) Alunite 2) Bauxite 3) Cryolite 4) Felspar Solution : Chief ore of aluminum is bauxite (Al 2 O 3. 2 H 2 O)
METALLURGY Level - 1 96. Which one of the following is used in the extraction of aluminium by electrolytic process 1) Al 2 O 3 2) Al (OH)3 3) Al. Cl 3 Solution :
METALLURGY Level - 1 97. Which of the following method is not used for the concentration of Bauxite ore 1) Serpeck's method 2) Baeyer's method 3) Hoope's method 4) Hall's method Solution : Bauxite is refined by Hoope’s Method.
METALLURGY Level - 1 98. Bauxite is boiled with aqueous Na. OH solution. Sodium metal aluminate solution is formed. This part in the metallurgy of Aluminium is called 1) Liquation 2) Amalgamation 3) Leaching 4) Calcination Solution : In leaching process aluminum is extracted.
METALLURGY Level - 1 99. When Bauxite is heated with Na. OH solution, the water soluble compound formed is 1) Na. Al. O 2 2) Na 3 Al. O 3 3) Al(OH)3 4) Al 2 O 3 Solution :
METALLURGY Level - 1 100. A mixture of White Bauxite powder and coke is heated in nitrogen gas very strongly. The products are 3) Al. N, CO, Si vapour Solution : ⇒The above process is called Serpeck’s process.
METALLURGY Level - 1 101. Aluminium is obtained by the electrolysis of pure Al 2 O 3 dissolved in 1) Alumina 2) Bauxite 3) Cryolite 4) Feldspar Solution :
METALLURGY Level - 1 102. Which of the following technique is used in the manufacture of aluminium from bauxite 1) Reduction with magnesium 2) Reduction with coke 3) Electrolytic reduction 4) Reduction with iron Solution : In Electrolytic reduction method aluminum is manufactured from bauxite.
METALLURGY Level - 1 103. In the electrolysis of alumina, cryolite is added to 1) Lower the melting point of alumina 2) Increase the electrical conductivity 3) Minimise the anode effect 4) Remove impurities from alumina Solution :
METALLURGY Level - 1 104. In the extraction of aluminium the electrolyte is 1) Fused cryolite with felspar 2) Fused cryolite with fluorspar 3) Pure alumina in molten cryolite with fluorspar 4) Pure alumina with bauxite and molten cryolite Solution : Pure alumina in molten cryolite with fluorspar is used for the extraction of aluminum
METALLURGY Level - 1 Thank you…
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