Practice Questions

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

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

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

Q47.Evaluate the following statements for their correctness. A. The elevation in boiling point temperature of water will be same for 0. 1 M NaCl and 0. 1 M urea. B. Azeotropic mixture boil without change in their composition. C. Osmosis always takes place from hypertonic to hypotonic solution. D. The density of 32% H2 SO4 solution having molarity 4. 09 M is approximately 1. 26 g mL–1 . E. A negatively charged sol is obtained when KI solution is added to silver nitrate solution. Choose the correct answer from the options given below: (1) B and D only (2) B, D and E only (3) A and C only (4) A, B and C only

Q47.The major product formed in the following reaction is JEE Main 2023 (06 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q47.Based on the given figure, the number of correct statement/s is/are JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper A. Surface tension is the outcome of equal attractive and repulsion forces acting on the liquid molecule in bulk. B. Surface tension is due to uneven forces acting on the molecules present on the surface. C. The molecule in the bulk can never come to the liquid surface. D. The molecules on the surface are responsible for vapour pressure if the system is a closed system.

Q47.The standard electrode potential ( M3+/M2+ ) for V, Cr, Mn & Co are −0. 26 V, − 0. 41 V, + 1. 57 V and +1. 97 V , respectively. The metal ions which can liberate H2 from a dilute acid are (1) V2+ and Mn2+ (2) Cr2+ and Co2+ (3) V2+ and Cr2+ (4) Mn2+ and Co2+

Q47.A' and 'B' formed in the following set of reactions are: (1) (2) (3) (4) Q48.'R' formed in the following sequence of reaction is: JEE Main 2023 (24 Jan Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q47.Match List-I and List-II List-I List-II Solvent molecules pass through semi permeable membrane A.Osmosis I. towards solvent side. Movement of charged colloidal particles under the influence Reverse B. II. of applied electric potential towards oppositely charged osmosis electrodes JEE Main 2023 (29 Jan Shift 2) JEE Main Previous Year Paper molecules pass through semi permeable membrane C. Electro osmosis III.Solvent towards solution side D.Electrophoresis IV. Dispersion medium moves in an electric field. Choose the correct answer from the options given below: (1) A-I, B-III, C-IV, D-II (2) A-III, B-I, C-IV, D-II (3) A-III, B-I, C-II, D-IV (4) A-I, B-III, C-II, D-IV

Q47.Match List-I with List-II. 1-Bromopropane is reacted with reagents in List-I to give product in List-II List-I Reagent List-II Product A. KOH (alc) I. Nitrile B. KCN (alc) II. Ester C. AgNO2 III. Alkene D H3CCOOAg IV. Nitroalkane Choose the correct answer from the options given below (1) A-III, B-I, C-IV, D-II (2) A-I, B-II, C-III, D-IV (3) A-I, B-III, C-IV, D-II (4) A-IV, B-III, C-II, D-I

Q47.L-isomer of tetrose X ( C4H8O4 ) gives positive Schiff’s test and has two chiral carbons. On acetylation ‘X’ yields triacetate. ‘X’ also undergoes following reactions. (1) (2) (3) (4) JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper Q48. ‘A’ and ‘B’ in the above reactions are: (1) (2) (3) (4) Q49. 'X' (1) (2) (3) (4)

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

Q48.An organic compound undergoes first order decomposition. If the time taken for the 60% decomposition is 540 s, then the time required for 90% decomposition will be is _____ s. (Nearest integer). Given : ln 10 = 2. 3; log 2 = 0. 3

Q48.Compound A from the following reaction sequence is : (1) Benzoic Acid (2) Aniline (3) Salicylic Acid (4) Phenol JEE Main 2023 (13 Apr Shift 2) JEE Main Previous Year Paper

Q48.For lead storage battery pick the correct statements A. During charging of battery, PbSO4 on anode is converted into PbO2 B. During charging of battery, PbSO4 on cathode is converted into PbO2 C. Lead storage battery consists of grid of lead packed with PbO2 as anode D. Lead storage battery has ~38% solution of sulphuric acid as an electrolyte Choose the correct answer from the options given below: (1) A, B, D only (2) B, C, D only (3) B, C only (4) B, D only

Q48.The standard reduction potentials at 295 K for the following half cells are given below: NO3−+ 4H+ + 3e−→NO(g) + 2H2O Eo = 0. 97 V V2+(aq) + 2e−→V(s) Eo = −1. 19 V Fe3+(aq) + 3e−→Fe(s) Eo = −0. 04 V Ag+(aq) + e−→Ag(s) Eo = 0. 80 V Au3+(aq) + 3e−→Au(s) Eo = 1. 40 V The number of metal(s) which will be oxidised by NO3− in aqueous solution is _____.

Q48.The number of statement/s which are the characteristics of physisorption is ___________. A. It is highly specific in nature B. Enthalpy of adsorption is high C. It decreases with increase in temperature D. It results into unimolecular layer E. No activation energy is needed

Q48.The number of incorrect statement/s from the following is/are A. Water vapours are adsorbed by anhydrous calcium chloride. B. There is a decrease in surface energy during adsorption. C. As the adsorption proceeds, ΔH becomes more and more negative. D. Adsorption is accompanied by decrease in entropy of the system.

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.Compound A reacts with NH4 Cl and forms a compound B. Compound B reacts with H2O and excess of CO2 to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A. B and C, are respectively. (1) CaCl2, NH3, NH4 HCO3 (2) CaCl2, NH+4 , (NH4)2 CO3 (3) Ca(OH)2, NH3, NH4 HCO3 (4) Ca(OH)2, NH+4 , (NH4)2 CO3

Q48.Which of the following represents the Freundlich adsorption isotherms? (A) JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper (B) (C) (D) Choose the correct answer from the options given below: (1) A, C, D only (2) A, B only (3) B, C, D only (4) A, B, D only

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. In the above conversion the correct sequence of reagents to be added is (1) (i) KMnO4, (ii) Br2 / Fe, (iii) Fe /H+, (iv) Cl2(2) (i) Br2 / Fe, (ii) Fe /H+, (iii) KMnO4, (iv) Cl2 (3) (i) Fe /H+, (ii) HONO, (iii) CuCl, (iv) KMnO4(4) (i)(v)Br2Br2/ Fe, (ii) Fe /H+, (iii) HONO, (iv) CuCl (v) KM