Practice Questions

Q45.The radical which mainly causes ozone depletion in the presence of UV radiations is : (1) Cl⋅ (2) NO⋅ ⋅ ⋅ (3) OH (4) CH 3

Q45.For the first order reaction A →B the half life is 30 min. The time taken for 75% completion of the reaction is mm. (Nearest integer) Given : log 2 = 0. 3010 log 3 = 0. 4771 log 5 = 0. 6989

Q45.The normal rain water is slightly acidic and its pH value is 5. 6 because of which one of the following ? (1) CO2 + H2O →H2 CO3 (2) N2O5 + H2O →2 HNO3 (3) 2 SO2 + O2 + 2H2O →2H2 SO4 (4) 4 NO2 + O2 + 2H2O →4 HNO3

Q45.The set which does not have ambidentate ligand(s) is (1) C2O42 - , ethylene diammine, H2O (2) EDTA 4 - , NCS-, C2O42 - (3) NO2- , C2O42 - , EDTA 4- (4) C2O42 - , NO2- , NCS-

Q45.Which of the following compounds is an example of Freon? (1) C2H2 F2 (2) C2 F4 (3) C2 HF3 (4) C2 Cl2 F2

Q46.Which of these reactions is not a part of breakdown of ozone in stratosphere? (1) ⊙ ⊙ (2) ⊙ ⊙ 2 Cl O(g) →ClO2(g) + Cl(g) ClO(g) + O(g) →O2(g) + Cl (3) ⊙ ⊙ (4) uv ⊙ ⊙ Cl(g) + O3(g) →O2(g) + ClO(g) CF2 Cl2(g) → Cl(g) + CF2 Cl(g)

Q46.For conversion of compound A →B, the rate constant of the reaction was found to be 4. 6 × 10−5 Lmol −1 s−1 . The order of the reaction is _____ .

Q46.The number of units, which are used to express concentration of solutions from the following is _________. (Mass percent, Mole, Mole fraction, Molarity, ppm, Molality.)

Q47.The water gas on reacting with cobalt as a catalyst forms (1) Methanal (2) Methanoic acid (3) Ethanol (4) Methanol

Q47.Suitable reaction condition for preparation of Methyl phenyl ether is (1) PhO⊝Na⊕, MeOH (2) Benzene, MeBr (3) Ph - Br, MeO⊖Na⊕ (4) PhO⊝Na⊕, MeBr

Q47.Caprolactam when heated at high temperature in presence of water, gives (1) Teflon (2) Dacron (3) Nylon 6, 6 (4) Nylon 6

Q47.The product, which is not obtained during the electrolysis of brine solution is (1) H2 (2) HCl (3) NaOH (4) Cl2

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)

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

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

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.Buna - S can be represented as: (1) (2) (3) (4) JEE Main 2023 (10 Apr Shift 2) 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.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.Polymer used in orlon is: (1) Polyethene (2) Polycarbonate (3) Polyamide (4) Polyacrylonitrile

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.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