Title 06. GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS - 03.pdf ✅

JEE ADVANCED 2024 Metallurgy 1. When roasting is carried out : (i) Sulphide ore is converted into oxide and sulphate (ii) remove water of hydration (iii) the ore melts (iv) arsenic and sulphur impurities are removed of. these statements: (A) (i), (ii) and (iii) are correct (B) (i) and (iv) are correct (C) (i) and (iv) are correct (D) (ii), (iii) and (iv) are correct 2. Assertion : Al is used as a reducing agent in aluminothermy. Reason : Al has a lower melting point than Fe, Cr and Mn. (A) Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1. (B) Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1. (C) Statement-1 is true, statement-2 is false. (D) Statement-1 is false, statement-2 is true. 3. Which of the oxides group among the following cannot be reduced by carbon :- (A) Fe O , ZnO 3 4 (B) PbO, Fe O3 4 (C) ZnO,SnO2 (D) CaO, K O2 4. The pair that does NOT require calcination is: (A) ZnO and Fe O xH O 2 3 2  (B) ZnCO3 and CaO (C) ZnO and MgO (D) Fe O2 3 and CaCO MgCO 3 3  5. Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false. (I) In Gold Schmidt thermite process aluminium acts as a reducing agent. (II) Mg is extracted by electrolysis of aq. Solution of MgCl2 . (III) Extraction of Pb is possible by carbon reduction method. (IV) Red bauxite is purified by Serpeck's process. (A) TTTF (B) TFFT (C) FTTT (D) TFTF 6. During the electrolysis of carnalite, MgCl2 is decomposed and not KCl . This is because of: (A) Lower decomposition voltage of MgCl2 than that of KCl . (B) Reverse reaction MgCl 2 K Mg 2KCl 2 + → + if KCl is decomposed under other experimental condition. (C) Both (A) and (B) (D) None of the above 7. Thermite is a mixture of: (A) Fe powder and Al O2 3 (B) Al powder and Fe O2 3 (C) Cu powder and Fe O2 3 (D) Zn powder and Cr O2 3 8. Consider two chemical reactions (A) and (B) that take place during metallurgical process: (A) ZnCO ZnO CO 3( s) (s) 2( g) ⎯⎯→ +  (B) 2ZnS 3O 2ZnO 2SO (s) 2( g) (s) 2( g)  + ⎯⎯→ + The correct option of names given to them respectively is: (A) (A) is calcination and (B) is roasting (B) Both (A) and (B) are producing same product so both are roasting (C) Both (A) and (B) are producing same product so both are calcination (D) (A) is roasting and (B) is calcination DPP - 03
9. STATEMENT-1 : SiO2 is the main impurity in white alumina. and STATEMENT-2 : White alumina is concentrated by Baeyer's process in Leaching. (A) Both statement I and statement II are incorrect (B) Statement I is correct but statement II is incorrect (C) Both statement I and statement II are correct (D) Statement I is incorrect but statement II is correct 10. Which of the following is true for calcination of a metal ore? (A) It makes the ore more porous. (B) The ore is heated to a temperature when fusion just begins. (C) Oxidation of ore takes place in presence of air. (D) Impurities of S, As and Sb are removed in the form of their volatile oxides. 11. Which of the following reaction(s) occur during calcination? (A) CaCO CaO CO 3 2 → + (B) 4FeS 11O 2Fe O 8SO 2 2 2 3 2 + → + (C) 2Al(OH) Al O 3H O 3 2 3 2 → + (D) CuS CuSO 2Cu 2SO + → + 4 2 12. Among the following metals how many metals are extracted by self-reduction method from their respective ores. Hg, Zn, Cu, Al, Mg, Pb, Fe, Sn. 13. Match the column: Column-I Column-II (Processes) (A) 4Au + 8NaCN + 2H2O + O2 (air) → 4Na[Au(CN)2] + 4NaOH (P) Leaching (B) CuFeS2 + 2H2SO4 → CuSO4 + FeSO4 + 2H2S (Q) Smelting (C) CaO + SiO2 ⎯⎯→ CaSiO3 (R) Hydrometallurgy (D) MgCl2 6H2O dry HCl g( ) ⎯⎯⎯⎯→  MgCl2 + 6H2O (S) Calcination
ANSWER KEY 1. (C) 2. (B) 3. (D) 4. (C) 5. (D) 6. (C) 7. (B) 8. (A) 9. (B) 10. (A, B) 11. (A, C) 12. (3) 13. (A → P, R); (B → P, R); (C → Q); (D → S)