Practice Questions

Q48.The major component of which of the following ore is sulphide based mineral? (1) Calamine (2) Siderite (3) Sphalerite (4) Malachite

Q48.The correct reaction profile diagram for a positive catalyst reaction. JEE Main 2023 (08 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q48.Amongst the following compounds, which one is an antacid? (1) Ranitidine (2) Meprobamate (3) Terfenadine (4) Brompheniramine

Q48.Match List I with List II List II List II (A) Tranquilizers (I) Anti blood clotting (B) Aspirin (II) Salvarsan (C) Antibiotic (III) Antidepressant drugs (D) Antiseptic (IV) Soframicine Choose the correct answer from the options given below: (1) (A)–IV, (B)–II, (C)–I, (D)–III (2) (A)–II, (B)–I, (C)–III, (D)–IV (3) (A)–III, (B)–I, (C)–II, (D)–IV (4) (A)–II, (B)–IV, (C)–I, (D)–III

Q48. t87.5 is the time required for the reaction to undergo 87. 5% completion and t50 is the time required for the reaction to undergo 50% completion. The relation between t87.5 and t50 for a first order reaction is t87.5 = x × t50 The value of x is _________. (Nearest integer)

Q48.The resistivity of a 0. 8M solution of an electrolyte is 5 × 10−3Ωcm. Its molar conductivity is 104Ω−1 cm2 mol−1 . (Nearest integer)

Q49.Inert gases have positive electron gain enthalpy. Its correct order is (1) Xe < Kr < Ne < He (2) He < Ne < Kr < Xe (3) He < Xe < Kr < Ne (4) He < Kr < Xe < Ne JEE Main 2023 (25 Jan Shift 1) JEE Main Previous Year Paper

Q49.Match List-I with List-II. List-I Polymer List-II Type/Class A. Nylon-2-Nylon-6 I. Thermosetting polymer B. Buna-N II. Biodegradable polymer C. Ureaformaldehyde resin III. Synthetic rubber D. Dacron IV. Polyester Choose the correct answer from the options given below: (1) A →IV; B →I; C →II; D →II (2) A →II; B →III; C →I; D →IV (3) A →IV; B →III; C →I; D →II (4) A →II; B →I; C →IV; D →III

Q49.In the wet tests for detection of various cations by precipitation, Ba2 + cations are detected by obtaining precipitate of (1) Ba(ox) : Barium oxalate (2) BaCO3 (3) Ba ( OAc ) 2 (4) BaSO4

Q49.Which of the following metals can be extracted through alkali leaching technique? (1) Sn (2) Pb (3) Au (4) Cu JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper

Q49.Polymer used in orlon is: (1) Polyethene (2) Polycarbonate (3) Polyamide (4) Polyacrylonitrile

Q49.Which of the following artificial sweeteners has the highest sweetness value in comparison to cane sugar? (1) Aspartame (2) Sucralose (3) Alitame (4) Saccharin

Q49.Buna - S can be represented as: (1) (2) (3) (4) JEE Main 2023 (10 Apr Shift 2) JEE Main Previous Year Paper

Q50.Given below are two statements: Statement I: In the metallurgy process,sulphide ore is converted to oxide before reduction. Statement II: Oxide ores in general are easier to reduce. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is correct but Statement II is (2) Both Statement I and Statement II are incorrect incorrect (3) Statement I is incorrect but Statement II is (4) Both Statement I and Statement II are correct correct

Q50.Which is not true for arginine? (1) It has a fairly high melting point (2) It is associated with more than one pKa values. (3) It has high solubility in benzene. (4) It is a crystalline solid.

Q50.The naturally occurring amino acid that contains only one basic functional group in its chemical structure is (1) asparagine (2) histidine (3) arginine (4) lysine Q51.1 g of a carbonate M2CO3 on treatment with excess HCl produces 0 . 01 mol of CO2. The molar mass of M2CO3 is gmol-1. (Nearest integer) x is (nearest integer)

Q50.The one that does not stabilize 2∘ and 3∘ structures of proteins is (1) – S – S – linkage (2) H - bonding (3) – O – O – linkage (4) van der Waals forces

Q50.A protein ‘X’ with molecular weight of 70, 000 u, on hydrolysis gives amino acids. One of these amino acid is (1) (2) (3) (4)

Q50.The reaction used for preparation of soap from fat is : (1) An addition reaction (2) Reduction reaction (3) Alkaline hydrolysis reaction (4) An oxidation reaction

Q50.A solution of CrO5 in amyl alcohol has a....colour (1) Green (2) Orange-Red (3) Yellow (4) Blue

Q50.Match List I and List II List I List II Vitamin Deficiency disease A Vitamin A I Beri-Beri B Thiamine II Cheilosis C Ascorbic acid III Xerophthalmia D Riboflavin IV Scurvy Choose the correct answer from the options given below (1) A - III, B - I, C - IV, D - II (2) A - IV, B - I, C - III, D - II (3) A - IV, B - II, C - III, D - I (4) A - III, B - II, C - IV, D - I JEE Main 2023 (06 Apr Shift 1) JEE Main Previous Year Paper

Q51.If 5 moles of BaCl2 is mixed with 2 moles of Na3PO4, the maximum number of moles of Ba3PO42formed is _________ (Nearest integer)

Q51.Formulae for Nessler's reagent is: (1) KHg2 I2 (2) KHgI3 (3) K2 HgI4 (4) HgI2

Q51.In Hall-Heroult process, the following is used for reducing Al2 O3 :- (1) Magnesium (2) Na3 AlF6 (3) Graphite (4) CaF2

Q51.The IUPAC name of K3[Co(C2O4)3] is: (1) Potassium tris(oxalato)cobaltate (III) (2) Potassium tris(oxalato)cobalt (III) (3) Potassium trioxalatocobalt (III) (4) Potassium trioxalatocobaltate (III)