Tiêu đề Metallurgy.pdf ✅

1 JEE Advanced (2024) Metallurgy CHEMISTRY Only One Option Correct Type Question (1-7) 1. Calamine, malachite, magnetite and cryolite, respectively are: [Ores] (A) ZnSO4, CuCO3, Fe2O3, AlF3 (B) ZnCO3, CuCO3, Cu(OH)2, Fe3O4, Na3AlF6 (C) ZnSO4, Cu(OH)2, Fe3O4, Na3AlF6 (D) ZnCO3, CuCO3, Fe2O3, Na3AlF6 2. Sulphide ores are common for the metals [Ores] (A) Ag, Cu and Pb (B) Ag, Cu and Sn (C) Ag, Mg and Pb (D) Al, Cu and Pb 3. Which of the following statements is true? [Ellingham diagram] (A) Reduction of a metal oxide is easier if the metal formed is in liquid state at reduction temperature (B) Reduction of metal oxide is normally less feasible at high temperature (C) The oxidation of CO into CO2 will have a negative slope on Ellingham diagram (D) The reactive metals have positive slope for oxidation on Ellingham diagram whereas non- reactive metals have a negative slope 4. Which of the following pairs of reactions is not related autoreduction process? [Reduction process] (A) 2HgS + 3O2 ⟶ 2HgO + 2SO2 2HgO + HgS ⟶ 3Hg + SO2 (B) 2Cu2S + 3O2 ⟶ 2Cu2O + 2SO2 2Cu2O + Cu2S ⟶ 6Cu + SO2 (C) 2PbS + 2O2 ⟶ 2PbO + SO2 2PbO + 2C ⟶ 2 Pb + CO2 (D) 2 2 3 PbS O PbO SO 2 + → + 2PbO + PbS ⟶ 3 Pb + SO2↑ 5. Sheelite (CaWO4) is an ore of tungsten, which contain tungestate ion. Tungestate ion is also present in: [Ores] (A) limonite (B) dolomite (C) wolframite (D) siderite 6. Copper matte is extracted from copper pyrites ore by heating it in blast furnace. The method is based on the principle that: [Copper extraction] (A) copper has more affinity for oxygen than sulphur at high temperature (B) iron has less affinity for oxygen than sulphur at high temperature (C) sulphur has less affinity for oxygen at high temperature (D) copper has less affinity for oxygen than sulphur at high temperature 7. Which of the following diagram is correctly related to refining of gold? [Refining] (A) (B) (C) (D) One Or More Than One Correct Type Question (8-12) 8. In many reactions hydrogen acts as reducing agent but it is not widely used as a reducing agent for metal extraction because: [Reduction process] (A) in the plot of ΔG° against T, ΔG° becomes less negative on rising the temperature for reaction of hydrogen with O2 (B) risk of explosion for H2 and oxygen in air (C) ΔS =+ ve for the consumption of 1 mole O2 by hydrogen (D) many metals react with H2 at elevated temperature forming hydride 9. The term calcinations is used to denote: [Calcination] (A) thermal decomposition of solid like carbonates (B) Solid-1 Δ → Solid-1 + Solid-3 (C) Solid-1 Δ → Solid-2 + Gas (D) Solid-1 + O2 Δ → Solid-2 + Gas Practice Sheet
2 10. In electrolysis Mn+(aq.), metal ions are discharged at negative electrodes (cathodes) and deposited there above method of extraction is not possible for: [Electrolytic process] (A) sodium (B) aluminium (C) silver (D) copper 11. Which of the following reactions is/are main reaction during partial roasting of chalcopyrite in blast furnace? [Roasting] (A) 2 2 2 2 3 Cu S O Cu O SO 2 (B) 2 2 3 FeS O FeO SO 2 + → + (C) FeO + SiO2 ⟶FeSiO3 (D) Cu2O + SiO2 ⟶ Cu2SiO3 12. Select which is associated during the extraction of iron in blast furnace: [Blast Furnace] (A) Iron formed in furnace melts below its melting point due to the presence of impurities (B) CO2 formed by combustion of C reacts with excess coke in furnace and produces CO (C) Fe2O3 is reduced by Al and produces melted iron (D) Limestone is decomposed to CaO which combines with impurity of SiO2 in ore Integer Type Question (13-17) 13. Total number of metals given below which can replace Mg2+ ion from aq. solution of MgCl2. Sodium, Gold, Copper, Lithium, Aluminium, Silver, Zinc. [Metal reactivity series] 14. Find the number of native ores out of given ores. Pyrolusite, Chromite, Siderite, Cassiterite, Calamine, Argentite, Limestone, Chalcopyrite. [Ores] 15. Ti is purified by following method: Impure metal + I2 TiIx Vapours Heating at high temp. Pure metal + I2 [Extraction of Metal] What is the value of x? 16. –n 2 x Excess Ag S KCN [Ag(CN) ]   n m Ag(CN) Zn Zn(CN) x y − − + →    [Extraction of Metal] Find the sum of x and y. 17. Find the number of substance which contain metal (chief) is in its elemental form: Copper matte, Argentite, Pig iron, Alumina, Blister copper. [Ores]
3 ANSWER KEY 1. ( B ) 2. ( A ) 3 . (A) 4 . (C) 5 . (C) 6 . (D) 7 . (B) 8 . (A, B, D) 9 . (A, C) 10 . (A, B) 11 . (B, C) 1 2 . (A, B, D ) 1 3 . (0) 1 4 . (0) 1 5 . (4) 1 6 . (6) 1 7 . (2)