Practice Questions

Q46.Lead storage battery contains 38% by weight solution of H2 SO4 . The van't Hoff factor is 2. 67 at this concentration. The temperature in Kelvin at which the solution in the battery will freeze is _____ (Nearest integer). Given Kf = 1. 8 K kg mol−1

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 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]

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.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 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.The electrode potential of the following half cell at 298 K X X2+(0. 001M)∥Y2+(0. 01M) Y is _____ ×10−2 V (Nearest integer) Given : E0 = −2. 36 V X2+∣X E0 = +0. 36 V Y2+Y 2.303 RT = 0. 06 V F

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.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.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.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.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.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.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)

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.The number of correct statements from the following is........... A. Ecell is an intensive parameter B. A negative Eo means that the redox couple is a stronger reducing agent than the H+/H2 couple. C. The amount of electricity required for oxidation or reduction depends on the stoichiometry of the electrode reaction. D. The amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte.

Q47.If the boiling points of two solvents X and Y (having same molecular weights) are in the ratio 2: 1 and their enthalpy of vaporizations are in the ratio 1 : 2, then the boiling point elevation constant of X is m times the boiling point elevation constant of Y . The value of m is (nearest integer).

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

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.A metal surface of 100 cm2 area has to be coated with nickel layer of thickness 0. 001 mm. A current of 2A was passed through a solution of Ni (NO3)2 for ‵x′ seconds to coat the desired layer. The value of x is _________. (Nearest integer) ( ρNi (density of Nickel) is 10 g mL–1, Molar mass of Nickel is 60 g mol−1 F = 96500 Cmol−1 )

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

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.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+