Tiêu đề 06. GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS - 02.pdf ✅

1 JEE ADVANCED 2024 Metallurgy 1. The method of concentration of the ore that makes use of difference in density between ore and impurities is called (A) Levigation (B) Leaching (C) Magnetic separation (D) Liquation 2. Froth floatation process for the concentration of ores is an illustration of physical phenomenon of (A) Adsorption (B) Absorption (C) Coagulation (D) Sedimentation 3. The role of depressants in Froth Flotation method is to (A) Selectively prevent one component of the ore from coming to the froth. (B) Reduce the consumption of oil for froth formation. (C) Stabilize the froth. (D) Enhance non-wettability of the mineral particles. 4. Which of the following ore is concentrated using group 1 cyanide salt? (A) Sphalerite (B) Calamine (C) Siderite (D) Malachite 5. In froth-floatation process, pine oil functions as (A) Activator (B) Frother (C) Collector (D) Agitator 6. Statement-I: Froth-floatation process is used to concentrate sulphide ores. Statement-II: There is difference in wettability of sulphide ore and gangue particles. (A) If both Statement-I and Statement-II are true and Statement-II is a correct explanation of Statement-I. (B) If both Statement-I and Statement-II are true and Statement-II is not a correct explanation of Statement-I. (C) If Statement-I is true but Statement-II is false. (D) If Statement-I is false but Statement-II is true. 7. Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are: (A) X = Na[Al(OH)4], Y = SO2, Z = Al2O3 (B) X = Na[Al(OH)4], Y = CO2, Z = Al2O3.xH2O (C) X = Al(OH)3, Y = CO2, Z = Al2O3 (D) X = Al(OH)3, Y = SO2, Z = Al2O3.xH2O 8. In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is: (A) TiO2 (B) Fe2O3 (C) ZnO (D) SiO2 9. Statement-I: Leaching of gold with cyanide ion in absence of air (O2) leads to cyano complex of Au(III). Statement-II: Zinc is oxidized during the displacement reaction carried out for gold extraction. In the light of the above statements, choose the correct answer from the options given below. (A) Both Statement-I and Statement-II are correct. (B) Both Statement-I and Statement-II are incorrect. (C) Statement-I is correct but Statement-II is incorrect. (D) Statement-I is incorrect but Statement-II is correct. 10. An non-magnetic ore containing the impurity of FeCr2O4 is concentrated by (A) magnetic-separation (B) gravity separation (C) froth-floatation method (D) electrostatic method 11. Which of the following is(are) regarded as iron ores? (A) Haematite (B) Magnetite (C) Limonite (D) Copper pyrites 12. Find the number of ore which are concentrated by magnetic separation method. Haemetic, Cassiterite, Copper Glance, Chromite, Cinnabar DPP - 02