Title METALLURGY.pdf ✅

NEET : Chemistry [ 196 ] www.allendigital.in  Digital Metallurgy 1. Which of the following is not an ore of Iron:- (1) Haematite (2) Limonite (3) Cassiterite (4) Magnetite 2. Aluminium is obtained from Al2O3 by – (1) Thermal reduction. (2) Hydro metallurgical method. (3) Electrolytic reduction. (4) Reduction by iron. 3. Zinc blende on roasting in air gives :– (1) Zinc carbonate (2) SO2 and ZnO (3) ZnS and ZnSO4 (4) CO2 and ZnO 4. The oxide cannot be reduced by coke (1) Cu2O, ZnO (2) Fe2O, ZnO (3) CaO, K2O (4) PbO, Fe3O4 5. An example of halide ores is:- (1) Galena (2) Bauxite (3) Cinnabar (4) Cryolite 6. Which is not a basic flux :- (1) Silica (2) Lime stone (3) Calcite (4) Quick lime 7. Iron pyrites ore is concentrated by:- (1) Froth floatation (2) Electrolysis (3) Roasting (4) Magnetic separation 8. Which of the following metal is extracted by electrolytic reduction process of its halide are:- (1) Copper (2) Iron (3) Sodium (4) Aluminium 9. Which of the following metal can not be extracted by smelting process:- (1) Lead (2) Zinc (3) Iron (4) Aluminium 10. The reducing agent for the extraction of iron metal at low temperature in a blast furnace is:- (1) Coke (2) Carbon (3) Carbon dioxide (4) Carbon monoxide 11. The reduction of Cr2O3, by heating it with aluminium is known as:- (1) Smelting (2) Roasting (3) Calcination (4) Aluminothermite process 12. Which of the following is obtained by hydrometallurgy :- (1) Copper (2) Gold (3) Silver (4) All of these 13. Aluminium is purified by :- (1) Roasting (2) Sublimation (3) Electrolytic refining (4) Reduction with carbon 14. In Goldschmidt thermite process, reducing agent is:- (1) Fe (2) Na (3) Ca (4) Al 15. Heating the sulphide ore in air to remove sulphur is known as:- (1) Roasting (2) Calcination (3) Smelting (4) Fluxing 16. Liquation process is used for refining:- (1) Bismuth (2) Lead (3) Tin (4) All 17. A mineral is called ore if (1) Metal present in the mineral is costly (2) A metal can be extracted from it (3) A metal can be extracted profitably from it (4) A metal can not be extracted from it 18. Self reduction process is used in the extraction of:- (1) Cu & Pb (2) Zn & Hg (3) Cu & Al (4) Fe & Pb 19. The process of converting hydrated Alumina into anhydrous Alumina is called:- (1) Roasting (2) Calcination (3) Smelting (4) Dressing 20. The metallurgical process in which a metal is obtained from its oxide ore :- (1) Smelting (2) Roasting (3) Calcination (4) Froth floatation Exercise - I
Metallurgy  Digital www.allendigital.in [ 197 ] 21. In the extraction of copper, metal obtained in the Bessemer converter is represented by which reaction ? (1) Cu2S + 2Cu2O → 6Cu + SO2 (2) Cu2S → 2Cu + S (3) Fe + Cu2O → 2Cu + FeO (4) 2Cu2O → 4Cu + O2 22. Among following :– (a) Zinc blende; ZnO (b) Chromite; Magnetic separation. (c) Bauxite; Al2O3.2H2O (d) Liquation; Hg like liquid metals Which is/are not correctly matched :– (1) (a) only (2) (b) only (3) (d) only (4) (a) & (d) both 23. Silver can be separated from lead by :- (1) Distillation (2) Amalgamation (3) Filtration (4) Cupellation 24. The maximum temperature obtained in the....region of the blast furnace used in extraction of iron:- (1) Reduction (2) Combustion (3) Fusion (4) Slag formation 25. The concentration of chromite (FeO. Cr2O3) is done by :- (1) Leaching process (2) Magnetic separation (3) Froth -flotation (4) Calcination 26. Which of the following process represents smelting process (1) 2 PbS + 3O2 → 2PbO + 2SO2 (2) Al2O3. 2H2O → Al2O3 + 2H2O (3) Fe2O3 + CO → 2Fe + 2CO2 (4) Cr2O3 + 2Al → Al2O3 + 2Cr + Heat 27. Which of the following match are incorrect :- (a) Goldschmidt aluminothermite process - Cr2O3 (b) Mac Arthur cyanide process - Fe (c) Mond process - Ni (d) Van Arkel process – Au (1) a, c (2) c, d (3) b, d (4) a, b 28. Electro metallurgical process (electrolysis of fused salt) is employed to extract :– (1) Lead (2) Silver (3) Sodium (4) Copper 29. In the extraction of copper from copper pyrites, iron is removed as:- (1) FeSO4 (2) FeSiO3 (3) Fe3O4 (4) Fe2O3 30. Which one of the following metals can not be extracted by using Al as a reducing agent :- (1) Na from Na2O (2) Cr from Cr2O3 (3) Mn from MnO2 (4) V from V2O5 31. In the electrolytic reduction for aluminium extraction the electrolyte used is :- (1) Fluorides of Al, Na and Ca (2) Al(OH)3 in NaOH solution (3) An aqueous solution of Al2(SO4)3 (4) Molten Al2O3 32. Which metal can be purified by distillation :- (1) Cu (2) Ag (3) Fe (4) Hg 33. Carbon cannot be used in the reduction of Al2O3 because :- (1) Carbon cannot reduce Al2O3 (2) The enthalpy of formation of CO2 is more than that of Al2O3 (3) Pure carbon is not easily available (4) The enthalpy of formation of Al2O3 is too high 34. Match list I with list II and select the correct answer using the codes given below the lists List I List II A. Van Arkel method I. Purification of titanium B. Cyanide process II. Concentration of Ag, Au C. Cupellation III.Purification of copper D. Poling IV. Refining of silver Codes : A B C D (1) I II IV III (2) II I III IV (3) IV II I III (4) III I II IV
NEET : Chemistry [ 198 ] www.allendigital.in  Digital 35. Anode mud obtained in electrolytic refining of copper contains :- (1) Ag (2) Au (3) Pt (4) All 36. Which of the following reaction is not involved in thermite process :- (1) 3Mn3O4 + 8Al ⎯→ 9Mn + 4Al2O3 (2) Cr2O3 + 2AI ⎯→ Al2O3 + 2Cr (3) 2Fe + Al2O3 ⎯→ 2Al + Fe2O3 (4) B2O3 + 2Al ⎯→ 2B + Al2O3 37. Alumino thermite process is used for the extraction of metals, whose oxides are :- (1) Strongly acidic (2) Not easily reduced by carbon (3) Not easily reduced by hydrogen (4) Stongly basic 38. Match the following :- I II (A) Calcination a. 2Cu2S + 3O2 → 2Cu2O + 2SO2 (B) Roasting b. Fe2O3. nH2O → Fe2O3 + nH2O (C) Slag c. Cr2O3 + 2Al → formation Al2O3 + 2Cr (D) Thermite d. SiO2 + FeO → FeSiO3 process A B C D (1) a b c d (2) b a d c (3) d a b c (4) c a b d 39. Main source of lead is PbS. It is converted to Pb by :- A :PbS air  ⎯⎯→ PbO + SO2; PbO C  ⎯⎯→ Pb + CO2 B :PbS insufficient air  ⎯⎯⎯⎯⎯→ PbO + SO2; PbS + PbO ⎯⎯→ Pb + SO2 Self reduction process is : (1) A (2) B (3) both (4) none 40. Match List- with List- and select the correct answer using the codes given below in the lists. List- (Metals) List- (Process/methods involved in extraction) (a) Ni 1. Self reduction (b) Al 2. Liquation (c) Cu 3.Vapour phase refining (d) Sn 4. Bayer's process (a) (b) (c) (d) (1) 3 1 2 4 (2) 3 4 1 2 (3) 1 2 4 3 (4) 3 2 4 1 41. Reducing agent in blast-furnace in extraction of Fe from Haematite is :- (1) Coke in furnace (2) Coke in upper part and CO in lower part of furnace. (3) CO in most parts of the furnace (4) CO in the furnace. 42. PbS air  ⎯⎯→ X , X + PbS ⎯→ Pb + SO2. ‘X’ may be :- (1) PbO (2) PbO2 (3) PbO and PbSO4 (4) PbO2 and PbO 43. Extraction of zinc from zinc blende is achieved by: (1) Electrolytic reduction (2) Roasting followed by reduction with carbon (3) Calcination followed by reduction with another metal (4) Roasting followed by self-reduction 44. Match the following 1. Zincite P Sulphide ore 2. Malachite Q Halide ore 3. Horn silver R Oxide ore 4. Iron pyrities S Carbonate ore (1) 1 – R; 2 – P; 3 – Q; 4 – S (2) 1 – R; 2 – S; 3 – Q; 4 – P (3) 1 – S; 2 – R; 3 – P; 4 – Q (4) 1 – Q; 2 – S; 3 – P; 4 – R
Metallurgy  Digital www.allendigital.in [ 199 ] 45. Which reaction is involved in extraction of Ag by cyanide process (1) AgBr + Na2S2O3 ⎯→ Na3 [Ag(S2O3)2] (2) AgCl + NH4OH ⎯→ [Ag(NH3)2] Cl (3) Ag2S + NaCN ⎯→ Na[Ag(CN)2] (4) None 46. Most abundant element in earth crust by weight is (1) H (2) He (3) Fe (4) Al 47. Gravity separation is based on (1) Difference in water solubility (2) Difference in specific gravity (3) Both (4) None 48. Correct statement regarding froth floatation method is (1) Ore particles wetted by water (2) Froth carries the gangue particles (3) As a depressant AgCl can be used for separation of ZnS and PbS (4) Aniline can be used as froth stabilizers 49. Leaching can be used for which set of metals extraction (1) Fe, Cu, Zn (2) Al, Fe, Ag (3) Al, Ag, Au (4) Ag, Au, Zn 50. In electrolytic refining of copper, anode is of (1) Pure copper (2) Graphite (3) Impure copper (4) Na/Ag 51. Zone refining method is based on that (1) Impurities are more soluble in water (2) Impurities are more soluble in solid metal (3) Impurities are more soluble in molten metal (4) Impurities are more soluble in vapour metal 52. Which method is an example of vapour phase refining. (1) Mond's process (2) Van Arkel method (3) Both 1 & 2 (4) None 53. Van Arkel method of refining is used for : (1) Zr, Ti (2) Ni, Pd (3) Sn, Pb (4) Zn 54. Which one of the following can be obtained by carbon reduction of its metal oxide ? (1) Cr (2) Fe (3) Mn (4) Mg 55. The chemical formula of calamine is - (1) ZnCO3 (2) CuFeS2 (3) Cu2O (4) ZnO 56. Which of the following acts as collector in the froath floatation of galena ? (1) Sodium ethyl xanthate (2) Pine oil (3) CuSO4 solution (4) NaCN or KCN 57. The iron obtained from the blast furnace is called- (1) Pig iron (2) Cast iron (3) Wrought iron (4) Steel 58. Magnetite is - (1) Fe3O4 (2) Fe2O3 (3) Cu2O (4) FeO 59. Malachite green is - (1) CuCO3.Cu(OH)2 (2) Cu2S (3) CuFeS2 (4) Cu2O EXERCISE-I (Conceptual Questions) ANSWER KEY Question 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Answer 3 3 2 3 4 1 1 3 4 4 4 4 3 4 1 Question 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Answer 4 3 1 2 1 1 4 4 2 2 3 3 3 2 1 Question 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 Answer 1 4 4 1 4 3 2 2 2 2 3 3 2 2 3 Question 46 47 48 49 50 51 52 53 54 55 56 57 58 59 Answer 4 2 4 3 3 3 3 1 2 1 1 1 1 1