Practice Questions

Q46.An organic compound ' 𝐴 ' with empirical formula C6H6O gives sooty flame on burning. Its reaction with bromine solution in low polarity solvent results in high yield of 𝐵 . 𝐵 is (1) (2) (3) (4)

Q46.Which of the following complex has a possibility to exist as meridional isomer? (1) [Co ( NH3 ) ( NO2 ) (2) [Pt ( NH3 ) 3 3] 2Cl2] (3) [Co ( en (4) [Co ( en ) ) 2Cl2] 3]

Q46.The major product ‘P’ formed in the given reaction is JEE Main 2023 (10 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q46.A first order reaction has the rate constant, k = 4. 6 × 10−3 s−1 . The number of correct statement/s from the following is/are Given: log 3 = 0. 48 . A. Reaction completes in 1000 s. B. The reaction has a half-life of 500 s. C. The time required for 10% completion is 25 times the time required for 90% completion. D. The degree of dissociation is equal to (1 −e−kt). E. The rate and the rate constant have the same unit.

Q46.Match List I with List II List I List II A Nitrogen oxides in air I Eutrophication B Methane in air II pH of rain water becomes 5. 6 C Carbon dioxide III Global warming D Phosphate fertilisers in water IV Acid rain Choose the correct answer from the options given below : (1) A-II, B-III, C-I, D-IV (2) A-I, B-II, C-III, D-IV (3) A-IV, B-III, C-II, D-I (4) A-IV, B-II, C-III, D-I JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper Q47. 80 mole percent of MgCl2 is dissociated in aqueous solution. The vapour pressure of 1. 0 molal aqueous solution of MgCl2 at 38oC is _____ mm Hg. (Nearest integer) Given: Vapour pressure of water at 38oC is 50 mm Hg

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.Which one of the following reactions does not occur during extraction of copper ? (1) 2 Cu2 S + 3O2 →2 Cu2 O + 2 SO2 (2) 2FeS + 3O2 →2FeO + 2 SO2 (3) CaO + SiO2 →CaSiO3 (4) FeO + SiO2 →FeSiO3

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

Q47.A student has studied the decomposition of a gas AB3 at 25°C . He obtained the following data p (mm Hg) 50 100 200 400 Relative t 1 (s) 4 2 1 0. 5 2 The order of the reaction is JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper (1) 0. 5 (2) 2 (3) 1 (4) 0 (zero)

Q47.Reaction of thionyl chloride with white phosphorus forms a compound [A] , which on hydrolysis gives [B] , a dibasic acid. [A] and [B] are respectively (1) P4O6 and H3 PO3 (2) PCl3 and H3 PO3 (3) PCl5 and H3 PO4 (4) POCl3 and H3 PO4

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.Consider the following sequence of reactions JEE Main 2023 (15 Apr Shift 1) JEE Main Previous Year Paper The product ‘ B’ is (1) (2) (3) (4)

Q47.Incorrect method of preparation for alcohols from the following is: (1) Reaction of Ketone with RMgBr followed by (2) Reaction of alkyl halide with aqueous NaOH. hydrolysis. (3) Hydroboration-oxidation of alkene. (4) Ozonolysis of alkene

Q47.In the following reaction, ‘A’ is JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

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.Consider the following reaction ( i ) dil . NaOH Propanal + Methanal = → Product B (ii) Δ(iii) NaCN(iv) H3O+ ( C5H8O3 ) The correct statement for product 𝐵 is. It is JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper (1) optically active and adds one mole of bromine (2) racemic mixture and is neutral (3) racemic mixture and gives a gas with saturated (4) optically active alcohol and is neutrall NaHCO3 solution

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

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

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.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