Practice Questions

Q55.The total number of chiral compound/s from the following is Q56.25 mL of an aqueous solution of KCl was found to require 20 mL of 1M AgNO3 solution when titrated using K2CrO4 as an indicator. What is the depression in freezing point of KCl solution of the given concentration? (Nearest integer). (Given : Kf = 2 . 0 K kg mol-1 ) Assume 1) 100% ionization and 2) density of the aqueous solution as 1 g mL-1

Q55.Consider the graph of Gibbs free energy G vs extent of reaction. The number of statement/s from the following which are true with respect to points (a), (b) and (c) is ______ A. Reaction is spontaneous at (a) and (b) B. Reaction is at equilibrium at point (b) and non-spontaneous at point (c) C. Reaction is spontaneous at (a) and non-spontaneous at (c) D. Reaction is non-spontaneous at (a) and (b)

Q55.The sum of oxidation state of the metals in Fe(CO)5 , VO2+ and WO3 is

Q55. A in the above reaction is : JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.When Fe0 . 93O is heated in presence of oxygen, it converts to Fe2O3. The number of correct statement/s from the following is ______ . A. The equivalent weight of Fe0 . 93O is Molecular0 . 79weight B. The number of moles of Fe2 + and Fe3 + in 1 mole of Fe0 . 93O is 0 . 79 and 0 . 14 respectively. C. Fe0 . 93O is metal deficient with lattice comprising of cubic closed packed arrangement of O2 - ions. D. The % composition of Fe2 + and Fe3 + in Fe0 . 93O is 85% and 15% respectively. Q56.5 g of NaOH was dissolved in deionized water to prepare a 450 mL stock solution. What volume (in mL) of this solution would be required to prepare 500 mL of 0 . 1 M solution ? Given : Molar Mass of Na, O and H is 23, 16 and 1 g mol – 1 respectively

Q56.Number of bromo derivatives obtained on treating ethane with excess of Br2 in diffused sunlight is _________

Q56.The magnetic moment is measured in Bohr Magneton (BM). Spin only magnetic moment of Fe in [Fe (H2O)6]3+ and [Fe (CN)6]3− complexes respectively is: (1) 6. 92 B. M. in both (2) 3. 87 B. M. and 1. 732 B. M. (3) 5. 92 B. M. and 1. 732 B. M. (4) 4. 89 B. M. and 6. 92 B. M.

Q56.The major product formed in the following reaction is (1) (2) (3) (4) Q57.. Match List I with List II : List II (Compound with Functional group List I (Reagents used) detected) A.Alkaline solution of copper I. sulphate and sodium citrate B. Neutral FeCl3 solution II. C. Alkaline chloroform solution III. D.Potassium iodide and sodium IV hypochloride Choose the correct answer from the options given below : JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper (1) A-III, B-IV, C-I, D-II (2) A-III, B-IV, C-II, D-I (3) A-IV, B-I, C-II, D-III (4) A-II, B-IV, C-III, D–I

Q56.In alkaline medium, the reduction of permanganate anion involves a gain of ____________ electrons.

Q56. The value of x in compound ‘ D’ is _____

Q56.The increasing order of pKa for the following phenols is (A) 2,4-Dinitrophenol (B) 4-Nitrophenol (C) 2,4,5-Trimethylphenol (D) Phenol (E) 3-Chlorophenol Choose the correct answer from the option given below : JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper (1) (A), (E), (B), (D), (C) (2) (A), (B), (E), (D), (C) (3) (C), (D), (E), (B), (A) (4) (C), (E), (D), (B), (A)

Q56.At 27°C, a solution containing 2 . 5 g of solute in 250 . 0 mL of solution exerts an osmotic pressure of 400 Pa. The molar mass of the solute is g mol-1 (Nearest integer) (Given : R = 0 . 083 L bar -1 mol-1 )

Q56.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A:- Butylated hydroxyl anisole when added to butter increases its shelf life. Reason R:- Butylated hydroxyl anisole is more reactive towards oxygen than food. In the light of the above statements, choose the most appropriate answer from the options given below:- (1) Both A and R are correct and R is the correct (2) A is correct but R is not correct. explanation of A. (3) A is not correct but R is correct. (4) Both A and R are correct but R is NOT the correct explanation of A.

Q56.Identify the product formed ( A and E ) (1) (2) (3) (4)

Q56.Given below are two statements : Statement I : Pure Aniline and other arylamines are usually colourless. Statement II : Arylamines get coloured on storage due to atmospheric reduction. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both Statement I and Statement II are incorrect (2) Both Statement I and Statement II are correct (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect correct

Q56.Among the following the number of compounds which will give positive iodoform reaction is _____. (a) 1 -Phenylbutan- 2 -one (b) 2-Methylbutan- 2-ol (c) 3-Methylbutan- 2-ol (d) 1-Phenylethanol (e) 3, 3 -dimethylbutan- 2-one (f) 1-Phenylpropan- 2-ol

Q56. The number of molecules which gives haloform test among the following molecules is :

Q56.The number of correct statement/s involving equilibria in physical processes from the following is ________ (A) Equilibrium is possible only in a closed system at a given temperature. (B) Both the opposing processes occur at the same rate. (C) When equilibrium is attained at a given temperature, the value of all its parameters became equal (D) For dissolution of solids in liquids, the solubility is constant at a given temperature.

Q56.The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is: Choose the correct answer from the options given below: (1) A > B > D > C (2) C > A > D > B (3) D > C > B > A (4) D > B > A > C

Q56. In the above reaction, left hand side and right hand side rings are named as ‵A′ and ‵B′ respectively. They undergo ring expansion. The correct statement for this process is: (1) Ring expansion can go upto seven membered (2) Finally both rings will become six membered rings each. (3) Finally both rings will become five membered (4) Only A will become 6 membered. each.

Q56.The structures of major products A, B and C in the following reaction are sequence. (1) (2) (3) (4)

Q56.Some amount of dichloromethane CH2Cl2 is added to 671 . 141mL of chloroform CHCl3 to prepare 2 . 6 × 10-3M solution of CH2Cl2DCM. The concentration of DCM is _____ ppm (by mass). JEE Main 2023 (30 Jan Shift 1) JEE Main Previous Year Paper Given: Atomic mass : C = 12; H: 1; Cl = 35 . 5 density of CHCl3 = 1 . 49g cm-3

Q56.For a reversible reaction A ⇌B, the ΔH forward reaction = 20 kJ mol–1 . The activation energy of the uncatalyzed forward reaction is 300 kJ mol–1 . When the reaction is catalysed keeping the reactant concentration same, the rate of the catalysed forward reaction at 27∘C is found to be same as that of the uncatalyzed reaction at 327∘C. The activation energy of the catalysed backward reaction is _______ kJ mol–1 . Q57. 20 mL of 0. 5 M NaCl is required to coagulate 200 mL of As2 S3 solution in 2 hours. The coagulating value of NaCl is ___________.

Q56.Decreasing order towards SN1 reaction for the following compounds is: (1) a > c > d > b (2) a > b > c > d (3) b > d > c > a (4) d > b > c > a

Q56.Find out the major products from the following reaction sequence. JEE Main 2023 (29 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)