Metallurgy PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Metallurgy · Set 1 (Q1-30)
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1. $Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode. Statement II: During the Hall-Heroult electrolysis process, purified A 1_{2} O_{3} is mixed with N a_{3} A l F_{6} to lower the melting point of the mixture. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Statement I is incorrect but Statement II is correct$ (2) $Both Statement I and Statement II are incorrect$ (3) $Statement I is correct but Statement II is incorrect$ (4) $Both Statement I and Statement II are correct$ 2. $4 Ag (s) + 8 CN^{-} (aq) + 2 H_{2} O (aq) + O_{2} (g) ⟶ 4 (Ag (CN)_{2})^{-} (aq) + 4^{-} OH (aq) The above reaction represents the process of concentration of ore in the extraction of silver. This process is$ (1) $Leaching$ (2) $Levigation$ (3) $Froth floatation$ (4) $Liquation$ 3. $The process of zone refining is used in the purification of$ (1) $Al$ (2) $Ge$ (3) $Cu$ (4) $Ag$ 4. $The metal which is refined by Mond process is (X), by van Arkel process is (Y) and by zone refining is (Z) . X, Y and Z respectively are$ (1) $Ni, Zr, Ga$ (2) $Zr, Ni, Ga$ (3) $Ga, Ni, Zr$ (4) $Ni, Ga, Zr$ 5. $Aluminium is extracted by the electrolysis of$ (1) $alumina$ (2) $bauxite$ (3) $molten cryolite$ (4) $alumina mixed with molten cryolite$ 6. $The major component of which of the following ore is sulphide based mineral?$ (1) $Calamine$ (2) $Siderite$ (3) $Sphalerite$ (4) $Malachite$ 7. $The correct statements regarding froth floatation method in metallurgy are I. Used for the purification of sulphide ores II. Used for the roasting of sulphide ores III. It is based on the relative densities of gangue and ore particles IV. It is based on the difference in the wetting properties of gangue and ore particles in frothing agent and water$ (1) $I & IV only$ (2) $II & III only$ (3) $II & IV only$ (4) $I & III only$ 8. $Which one of the following ores does not contain iron"$ (1) $Hematite$ (2) $Magnetite$ (3) $Calamine$ (4) $Siderite$ 9. $The ore which is purified by Leaching process is$ (1) $Zinc blende$ (2) $Bauxite$ (3) $Calamine$ (4) $Haematite$ 10. $Which one of the following ores is best concentrated by froth floatation method ?$ (1) $magnetite$ (2) $cassiterite$ (3) $galena$ (4) $malachite.$ 11. $When limestone is heated, CO_{2} is given off. The metallurgical operation is$ (1) $smelting$ (2) $reduction$ (3) $calcination$ (4) $roasting.$ 12. $The ore that contains both iron and copper is:$ (1) $copper pyrites$ (2) $malachite$ (3) $dolomite$ (4) $azurite$ 13. $Given below are two statements : Statement I: Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper. Statement II: It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using'depressants' in a froth flotation method. Choose the most appropriate answer from the options given below :$ (1) $Statement I is true but Statement II is false.$ (2) $Both Statement I and Statement II are true.$ (3) $Statement I is false but Statement II is true.$ (4) $Both Statement I and are Statement II false.$ 14. $The processes of calcination and roasting in metallurgical industries, respectively, can lead to$ (1) $Global warming and photochemical smog$ (2) $Photochemical smog and ozone layer depletion$ (3) $Photochemical smog and global warming$ (4) $Global warming and acid rain$ 15. $The chemical that is added to reduce themelting point of the reaction mixture during the extraction of aluminiumis :$ (1) $Cryolite$ (2) $Bauxite$ (3) $Calamine$ (4) $Kaolite Official$ 16. $The pair that does NOT require calcination is:$ (1) $ZnO and MgO$ (2) $ZnO and Fe_{2} O_{3} \cdot x H_{2} O$ (3) $ZnCO_{3} and CaO$ (4) $Fe_{2} O_{3} and CaCO_{3} \cdot MgCO_{3}$ 17. $In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved ?$ (1) $Zinc$ (2) $Gold$ (3) $Silver$ (4) $Copper$ 18. $The common impurity present in bauxite is$ (1) $CuO$ (2) $ZnO$ (3) $Fe_{2} O_{3}$ (4) $Cr_{2} O_{3}$ 19. $Extraction of metal from the ore cassiterite involves$ (1) $carbon reduction of an oxide ore$ (2) $self-reduction of a sulphide ore$ (3) $removal of copper impurity$ (4) $removal of iron impurity$ 20. $Match List I with List II. List I Ore A. Siderite B. Malachite C. Sphalerite D. Calamine List II Composition I. Fe C O_{3} II. C u C O_{3} .Cu (O H)_{2} III. ZnS IV. Z n C O_{3} Choose the correct answer from the options given below:$ (1) $A-I,B-II,C-III,D-IV$ (2) $A-III, B-IV, C-II, D-I$ (3) $A-IV, B-III, C-I, D-II$ (4) $A-I, B-II, C-IV, D-III$ 21. $Which of the following elements is present as the impurity to the maximum extent in the pig iron ?$ (1) $Manganese$ (2) $Carbon$ (3) $Silicon$ (4) $Phosphorus$ 22. $Match the following List-I Refining Methods (A) Zone refining (B) Poling (C) Liquation (D) Vapor phase List-II Metal to be refined (I) titanium (II) Tin (III)Gallium (IV) Copper refining The correct answer is$ (1) $A - IV, B - II, C - I, D - III$ (2) $A - III, B - I, C - IV, D - II$ (3) $A - III, B - IV, C - II, D - I$ (4) $A - II, B - IV, C - I, D - III$ 23. $Kernite and cryolite are the minerals of two elements X and Z . Respectively X and Z are$ (1) $B, Ga$ (2) $B, Al$ (3) $Al, In$ (4) $B, Tl$ 24. $Identify A and B respectively in the following reactions: 4 Au (s) + 8 CN^{-} (aq) + 2 H_{2} O (aq) \to O 2 (g) A (aq) + 4 OH^{-} (aq) \to Zn (s) B + 2 Au (s)$ (1) $(Au (CN)_{2})^{-}; (Zn (CN)_{4})^{2 -}$ (2) $Au (CN)_{4}; (Zn (CN)_{4})^{2 -}$ (3) $HCN; (Au (CN)_{4})^{2 -}$ (4) $AuCN; [HCN]$ 25. $Match List -I with List - II List I (Ore) (1) Kernite (2) Cassiterite (3) Calamine (4) Cryolite List II (Element Present) (i) Tin (ii) Boron (iii) Fluorine (iv) Zinc Choose the correct answer from the options given below:$ (1) $(1)-(ii), (2)-(iv), (3)-(i), (4)-(iii)$ (2) $(1)-(ii), (2)-(i), (3)-(iv), (4)-(iii)$ (3) $(1)-(i), (2)-(iii), (3)-(iv), (4)-(ii)$ (4) $(1)-(iii), (2)-(i), (3)-(ii), (4)-(iv)$ 26. $Function of potassium ethylxanthate in froth floatation process is to make the ore$ (1) $hydrophobic$ (2) $hydrophilic$ (3) $heavier$ (4) $lighter.$ 27. $The temperature of the slag zone in the metallurgy of iron using blast furnace is$ (1) $1500 - 1600^{\circ} C$ (2) $400 - 700^{\circ} C$ (3) $800 - 1000^{\circ} C$ (4) $1200 - 1500^{\circ} C$ 28. $Refining using liquation method is the most suitable for metals with :$ (1) $Low melting point$ (2) $High boiling point$ (3) $High electrical conductivity$ (4) $Less tendency to be soluble in melts than impurities$ 29. $Given below are two statements. Statement I: The choice of reducing agents for metals extraction can be made by using Ellingham diagram, aplot of ΔG vs temperature. Statement II: The value of ΔS increases from left to right in Ellingham diagram. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Both Statement I and Statement II are true$ (2) $Statement I is false but Statement II is true$ (3) $Both Statement I and Statement II are false$ (4) $Statement I is true but Statement II is false$ 30. $Cast iron is used for the manufacture of$ (1) $wrought iron, pig iron and steel$ (2) $pig iron, scrap iron and steel$ (3) $wrought iron and pig iron$ (4) $wrought iron and steel$