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

PAPER 1 (1.) Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature? [NEET 2021] (1) Distillation (2) Zone refining (3) Electrolysis (4) Chromatography (2.) The maximum temperature that can be achieved in blast furnace is: [NEET 2021] (1) upto 1900 K (2) upto 5000 K (3) upto 1200 K (4) upto 2200 K (3.) Match List-I with List-II.   3 4 3 2 3 2 4 2 5 List-I (Ores) List-II Haematite (i) Fe O Magnetite (ii) ZnCO Calamine (iii) Fe O Kaolinite (iv) Al (OH) Si O Choose the correct answer from the options given below: (1) (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv) (2) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv) (3) (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv) (4) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii) (4.) Read the following statements and choose the set of correct statements : (A) Chrome steel is used for cutting tools and crushing machines. (B) The fine dust of aluminium is used in paints and lacquers. (C) Copper is used for reduction of alcohol. (D) Zinc dust is used as a reducing agent in the manufacture of paints. (E) Iron is used for galvanising zinc. Choose the most appropriate answer from the options given below : [NEET 2023 MANIPUR] (1) (D) and (E) only (2) (A) and (D) only (3) (A), (B) and (D) only (4) (B), (C) and (D) only (5.) The reaction that does not take place in a blast furnace between 900 K to 1500 K temperature range during extraction of iron is [NEET 2023] (1) C CO 2CO + →2 (2) CaO SiO CaSiO + →2 3 (3) Fe O CO 2FeO CO 2 3 2 + → + (4) FeO CO Fe CO + → + 2 (6.) The substance not likely to contain CaCO3 is [Page: 152] (1) calcined gypsum (2) sea shells (3) dolomite (4) a marble statue. (7.) Which of the following is nor an oxide ore [Page: 152]
(1) Haematite (2) Siderite (3) Pyrolusite (4) Bauxite (8.) Which metal is found in free state [Page: 152] (1) Aluminium (2) Copper (3) Iron (4) Gold (9.) Which of the following is most abundant element in the earth’s crust [Page: 152] (1) Aluminium (2) Oxygen (3) Silicon (4) Iron (10.) Which of the following does not contain aluminium? [Page: 152] (1) Cryolite (2) Fluorspar (3) Feldspar (4) Mica (11.) A number of elements are available in earth’s crust but most abundant elements are [QR Code, NCERT Exemplar Modified, Page: 152] (I) Al (II) Cu (III) Fe (IV) Ag (1) I & II (2) II & III (3) I & III (4) III & IV (12.) Copper pyrite, the chief ore of copper, is [Page: 152] (1) CuFeS2 (2) Cu S2 (3) 3 ( )2 CuCO Cu OH  (4) Cu O2 (13.) Match the following columns. [QR Code, NCERT Exemplar Modified] Column I Column II (A) Pendulum (1) 3 ( )2 CuCO Cu OH  (B) Calamine (2) HgS (C) Barytes (3) Nickel steel (D) Cinnabar (4) BaSO4 A B C D (1) 3 2 4 1 (2) 3 1 4 2 (3) 2 1 4 3 (4) 2 1 3 4 (14.) Which of the following ores represent as sulphate Ore? [Page: 152] (1) Calcite (2) Cinnabar (3) Anglesite (4) Dolomite (15.) Which is malachite among the following [Page: 152] (1) CuFeS2 (2) ( )2 Cu OH
(3) Fe O3 4 (4) 3 ( )2 CuCO Cu OH  (16.) Pyrolusite is an ore of [Page: 152] (1) Ag (2) Hg (3) Sn (4) Mn (17.) In which of the following ore does not match with the metal? [Page: 152] (1) Zinc‐ Calamine (2) Lead‐ Malachite (3) Iron‐ Siderite (4) Aluminium‐ Kaolinite (18.) Identify the incorrect statement. [Odisha NEET‐2019, Page: 152] (1) Gangue is an ore contaminated with undesired materials. (2) The scientific and technological process used for isolation of the metal from its ore is known as metallurgy. (3) Minerals are naturally occuring chemical substances in the Earth’s crust. (4) Ores are minerals that may contain a metal. (19.) Consider the following statements: [Page: 153] (I) Iron is second most abundant metal in earth’s crust. (II) Por extraction purpose cryolite is chosen for aluminium. (III) Por extraction of iron, oxide ore are usually taken. Which of the given statement(s) is/are correct). (1) I only (2) II only (3) I a III only (4) All of these (20.) Assertion: Sulphur, nitrogen etc. occur in nature in the native state. Reason: These elements have low reactivity. [Page: 152] (1) Both A and R are correct and R is correct explanation of A. (2) Both A and R are correct but R is not correct explanation of A. (3) A is correct but R is incorrect. (4) Both A and R are false. (21.) Assertion: Metal halides occur mainly in rocks and sulphides occur mostly in lakes and seas. Reasons: Metal halides are insoluble in water while sulphides are highly soluble in water. [Page: 152] (1) Both A and R are correct and R is correct explanation of A. (2) Both A and R are correct but R is not correct explanation of A. (3) A is correct but R is incorrect. (4) Both A and R are false. (22.) Copper pyrites are concentrated by [Page: 153] (1) froth‐floatation method (2) gravity method
(3) hydraulic washing (4) electromagnetic method. (23.) Electromagnetic separation is used in the concentration of [Page: 153] (1) Copper pyrites (2) Cassiterite (3) Galena (4) Calamine (24.) Which of the following is used for concentration of bauxite ore? [Page: 154] (1) Levigation (2) Froth floatation (3) Magnetic separation (4) Leaching (25.) Froth floatation process is based on which of the following properties? [Page: 154] (1) magnetic properties of ore particles (2) Solubilities of ore particles (3) Wettability of ore particles (4) Specific gravities of ore particles (26.) Which of the following sulphide ore is nor concentrated by froth floatation process but concentrated by leaching? [Page: 154] (1) Galena (2) Argentite (3) Sphalerite (4) Copper pyrites (27.) The metal extracted by leaching with cyanide is [Page: 154] (1) Mg (2) Ag (3) Cu (4) Na (28.) In the froth floatation process for the purification of ores, the ore particles float because [Page: l54] (1) they are very light (2) their surface cannot be wetted easily (3) their surface can be wetted easily (4) they are heavy. (29.) Which of the following is not used as froth stabiliser during froth floatation process [Page: 154] (I) Pine oil (II) Fatty acid (III) Cresols (IV) Aniline (1) I only (2) I and II both (3) III and IV both (4) III only (30.) Extraction of gold and silver involves teaching the metal with CN ion. The metal is recovered by [QR Code, NCERT Exemplar modified, Page: 154] (1) displacement of metal by some other metal from the complex ion (2) calcination of metal complex (3) calcination followed by roasting (4) calcination followed by reduction of metal complex. (31.) In froth floatation process frothers are used to stabilise the froth. The froth could be