Metallurgy PYQs Set 2 (PDF)

Set 2 of 8 · Questions 31-60 of 216

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Mere Teacher · Previous Year Questions NEET Chemistry · Metallurgy · Set 2 (Q31-60)
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31. $Sphalerite, siderite and malachite are the ores of metals X, Y and Z . The atomic numbers of them are respectively.$ (1) $30, 26, 29$ (2) $26, 30, 29$ (3) $30, 29, 26$ (4) $29, 30, 26$ 32. $Match the following List-I List - II (Name of the mineral) (Тype) A. Calamine I. Sulphide B. Bauxite II. Halide C. Kaolinite III. Carbonate D. Cryolite IV. Oxide V. Silicate The correct answer is$ (1) $A-IV; B-III; C-I; D-II$ (2) $A-III; B-IV; C-I; D-V$ (3) $A-IV; B-II; C-V; D-I$ (4) $A-III; B-IV; C-V; D-II$ 33. $Which of the following ore contains both Fe and Cu ?$ (1) $Chalcopyrite$ (2) $Malachite$ (3) $Cuprite$ (4) $Azurite$ 34. $Copper is extracted from copper pyrites by heating in a Bessemer converter. The method is based on the principle that$ (1) $iron has less affinity for oxygen than sulphur at high temperature$ (2) $sulphur has less affinity for oxygen at high temperature$ (3) $copper has more affinity for oxygen than sulphur at high temperature$ (4) $copper has less affinity for oxygen than sulphur at high temperature.$ 35. $Which of the following chemical reactions represents Hall-Heroult Process?$ (1) $C r_{2} O_{3} + 2A1 \to A 1_{2} O_{3} + 2Cr$ (2) $2 A 1_{2} O_{3} + 3C \to 4A1 + 3 C O_{2}$ (3) $FeO + CO \to Fe + C O_{2}$ (4) $2 [A u (C N)_{2}]_{(a q)}^{-} + Z n (s) \to 2 A u (s) + [Z n (C N_{4})]^{2 -}$ 36. $Sulphide ores ofmetals are usually concentrated by froth floatation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?$ (1) $Galena$ (2) $Copper pyrite$ (3) $Sphalerite$ (4) $Argentite(2007)$ 37. $Heating a mixture of Cu_{2} O and Cu_{2} S will give$ (1) $CuO + CuS$ (2) $Cu + SO_{3}$ (3) $Cu + SO_{2}$ (4) $Cu (OH)_{2} + CuSO_{4}$ 38. $The ore that is concentrated by the Froth floatation process is$ (1) $chalcopyrites$ (2) $cryolite$ (3) $cuprite$ (4) $calamine$ 39. $Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature. Reason R: CO tends to get decomposed at higher temperature. In the light of the above statements, choose the correct answer from the options given below$ (1) $Both A and R are correct and R is the correct explanation of A$ (2) $A is not correct but R is correct$ (3) $Both A and R are correct but R is NOT the correct explanation of A$ (4) $A is correct but R is not correct$ 40. $Ellingham diagram is a graphical representation of:$ (1) $Δ G vs T$ (2) $(Δ G - T Δ S) vs T$ (3) $Δ H vs T$ (4) $Δ G vs P$ 41. $In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:$ (1) $separate CuO as C u S i O_{3}$ (2) $remove calcium as C a S i O_{3}$ (3) $decrease the temperature needed for roasting of C u_{2} S$ (4) $remove FeO as F e S i O_{3}$ 42. $In the context of the Hall - Heroult process for the extraction of Al, which of the following statements is false?$ (1) $CO and CO2 are produced in this process$ (2) $Al2O3 is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity$ (3) $Al3+ is reduced at the cathode to form Al$ (4) $Na3AlF6 serves as the electrolyte$ 43. $Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly ?$ (1) $C O_{2} is thermodynamically more stable than C S_{2}$ (2) $Metal sulphides are less stable than the corresponding oxides$ (3) $C O_{2} is more volatile than C S_{2}$ (4) $Metal sulphides are thermodynamically more stable than C S_{2}$ 44. $Which one of the following statements is false?$ (1) $During roasting, moisture is removed from the ore.$ (2) $The ore is freed from almost all nonmetallic impurities.$ (3) $Calcination of ore is carried out in the absence of any blast of air.$ (4) $The concentrated zinc blende is subjected to calcination during its extraction by pyrometallurgy.$ 45. $The zone refining process of metals is based on the principle of$ (1) $excess noble character of the liquid metal than that of impurity.$ (2) $lower melting point of the impurity than that of pure metal$ (3) $greater solubility of impure metal than that of impurity$ (4) $greater solubility of the impurities in the molten state than in the solid.$ 46. $Given below are two statements. Statement I: During electrolytic refining, blister copper deposits precious metals Statement II: In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode. In the light of the above statements, choose the correct answer from the options given below.$ (1) $Both Statement I and Statement II are true.$ (2) $Both Statement I and Statement II are false.$ (3) $Statement I is true but Statement II is false.$ (4) $Statement I is false but Statement II is true.$ 47. $Which of the following elements is present as the impurity to the maximum extent in the pig iron?$ (1) $Manganese$ (2) $Carbon$ (3) $Silicon$ (4) $Phosphorus (2011)$ 48. $The method of zone refining of metals is based on the principle of$ (1) $greater noble charactor of the solid metal then that of the impurity$ (2) $greater solubility of the impurity in the molten state than in the solid$ (3) $greater mobility of the pure metal than that of impurity$ (4) $higher melting point of the impurity than that of the pure metal$ 49. $The addition of silica during the extraction of copper from its sulphide ore :-$ (1) $converts copper sulphide into copper silicate$ (2) $converts iron oxide into iron silicate$ (3) $reduces copper sulphide into metallic copper$ (4) $reduces the melting point of the reaction mixture$ 50. $Malleability and ductility of metals can be accounted due to$ (1) $the capacity of layers of metal ions to slide over the other$ (2) $the interaction of electrons with metal ions in the other$ (3) $the presence of electrostatic force$ (4) $the crystalline structure in metal.$ 51. $Which of the following process does not involve heating?$ (1) $Calcination$ (2) $Smelting$ (3) $Roasting$ (4) $Levigation$ 52. $Identify the correct statements from the following I. Brass is an alloy of copper and nickel II. Bronze is an alloy of copper and zinc III. German silver is an alloy of copper, zinc and nickel IV. Brass is an alloy of copper and zinc$ (1) $I & II only$ (2) $II & III only$ (3) $III & IV only$ (4) $I & IV only$ 53. $Given below are two statements. Statement I: Pig iron is obtained by heating cast iron with scrap iron. Statement II: Pig iron has a relatively lower carbon content than that of cast iron. In the light of the above statements, choose the correct answer from the options given below.$ (1) $Both Statement I and Statement II are correct.$ (2) $Both Statement I and Statement II are not correct.$ (3) $Statement I is correct but Statement II is not correct$ (4) $Statement I is not correct but Statement II is correct.$ 54. $Ellingham diagram is the plot of X vs Y . what are X and Y?$ (1) $Δ G^{\circ}, T$ (2) $Δ G^{\circ}, 1/ T$ (3) $Δ S^{\circ}, T$ (4) $Δ H^{\circ}, 1/ T$ 55. $Why iron pyrite is not the ideal choice of ore for the extraction of iron?$ (1) $It produces polluting gases$ (2) $Thermodynamically not feasible$ (3) $Highly stable$ (4) $Difficult in roasting process$ 56. $In liquation process used for tin (Sn), the metal:$ (1) $is reacted with acid$ (2) $is dissolved in water$ (3) $is brought to molten form which is made to flow on a slope$ (4) $is fused with NaOH.$ 57. $The major components of German Silver are:$ (1) $Cu, Zn and Ag$ (2) $Ge, Cu and Ag$ (3) $Zn, Ni and Ag$ (4) $Cu, Zn and Ni$ 58. $LIST I LIST II A. Reverberator furnace I. Pig Iron B. Electrolytic cell II. Aluminum C Blast furnace III. Silicon D Zone Refining furnace IV. Copper$ (1) $A-IV, B-II, C-I, D-III$ (2) $A- I, B - IV, C - II, D - III$ (3) $A-I, B - III, C - II, D - IV$ (4) $A-III,B-IV,C-I,D-II$ 59. $How many of the following can be purified by using zone refining method? Ni, B, Ti, In, Ge, Mn, Ag, Si, Ga$ (1) $4$ (2) $5$ (3) $6$ (4) $7$ 60. $Which of the following statement is not correct about Ellingham diagram?$ (1) $ΔG increases with an increases in temperature$ (2) $It consists of plots of ΔfG° vs T for formation of oxides$ (3) $a coupling reaction can be well expressed by this diagram$ (4) $It express the kinetics of the reduction process$