Title 06. GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS - 05.pdf ✅

JEE ADVANCED 2024 Metallurgy 1. In the extraction of nickel by Mond process, the metal is obtained by: (A) electrochemical reduction (B) thermal decomposition (C) chemical reduction by aluminium (D) reduction by carbon 2. Iron obtained from blast furance is: (A) wrought iron (B) cast iron (C) pig iron (D) steel 3. Silica is added to roasted copper ores during extraction in order to remove (A) cuprous sulphide (B) ferrous oxide (C) ferrous sulphide (D) cuprous oxide 4. Assertion: Generally in smelting, roasted/cacinated ore is heated with powdered coke in presence of a flux. Reason: Oxides are reduced to metals by C or CO. Impurities are removed as slag. (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. 5. Zone refining is used for purification of (A) Ge (B) Si (C) Ga (D) Se 6. Hoop's process of purification of aluminium involves formation of layers during electrolysis. It involves (A) the three layers have same densities but different materials. (B) the three layers have different densities (C) the upper layer is of pure aluminium which acts as a cathode (D) the bottom layer is of impure aluminium which acts as an anode and middle layer consists of cryolite and BaF2. 7. Which of the following are true for electrolytic extraction of aluminium (A) cathode material contains graphite (B) anode material contains graphite (C) cathode reacts away forming CO2 (D) anode reacts away forming CO2 8. The major role of fluorspar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6) is (A) as a catalyst (B) to make the fused mixture very conducting (C) to lower the melting temperature of the mixture (D) to decrease the rate of oxidation of carbon at the anode. Comprehension # 9 to 11 9. Which of the above curve is wrongly presented - (A) C CO → 2 (B) Pb PbO → (C) Zr ZrO → 2 (D) Mg MgO → 10. Which of the above metal oxide is having minimum thermal decomposition temperature? (A) CaO (B) FeO (C) ZrO2 (D) MgO 11. Which of the followings metal's oxide can be reduced by Fe as reducing agent at temperature ( ) T1 . (A) Zr (B) Ca (C) Mg (D) None of these DPP - 05