Practice Questions

Q48.Isomeric amines with molecular formula C8H11N give the following tests IsomerP ⇒ Can be prepared by Gabriel phthalimide synthesis IsomerQ ⇒ Reacts with Hinsberg’s reagent to give solid insoluble in NaOH IsomerR ⇒ Reacts with HONO followed by β-naphthol in NaOH to give red dye. IsomersP, Q and R respectively are JEE Main 2023 (10 Apr Shift 1) 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.Following figure shows dependence of molar conductance of two electrolytes on concentration. Λ0m is the limiting molar conductivity. The number of Incorrect statement(s) from the following is _____ (A) Λ0m for electrolyte A is obtained by extrapolation (B) For electrolyte B, Λm Vs √c graph is a straight line with intercept equal to Λ0m (C) At infinite dilution, the value of degree of dissociation approach zero for electrolyte B . (D) Λm for any electrolyte A or B can be calculated using λ° for individual ions.

Q48.In the reaction given below The product ‘X’ is : (1) (2) (3) (4)

Q48.For a chemical reaction A + B → Product, the order is 1 with respect to A and B. Rate [A] [B] mol L−1 S−1 mol L−1 mol L−1 0. 10 20 0. 5 0. 40 x 0. 5 0. 80 40 y What is the value of x and y? (1) 160 and 4 (2) 80 and 4 (3) 80 and 2 (4) 40 and 4 JEE Main 2023 (11 Apr Shift 2) JEE Main Previous Year Paper

Q48. Compound P is neutral, Q gives effervescence with NaHCO3 while R reacts with Hinsberg’s reagent to give solid soluble in NaOH . Compound P is (1) (2) (3) (4)

Q48.The graph which represents the following reaction is: OH− (C6H5)3C −Cl Pyridine (C6H5)3C −OH (1) (2) (3) (4)

Q49.The statement/s which are true about antagonists from the following is/are: A. They bind to the receptor site. B. Get transferred inside the cell for their action. C. Inhibit the natural communication of the body. D. Mimic the natural messenger. Choose the correct answer from the options given below: (1) B only (2) A, C and D (3) A and C (4) A and B

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.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

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.Match List I with List II: List I (Monomer) List II (Polymer) (A) Tetrafluoroethene (I) Orlon (B) Acrylonitrile (II) Natural rubber (C) Caprolactam (III) Teflon (D) Isoprene (IV) Nylon- 6 Choose the correct answer from the options given below: (1) (A) −(III), (B) −(I), (C) −(IV), (D) −(II) (2) (A) −(IV), (B) −(I), (C) −(II), (D) −(III) (3) (A) −(III), (B) −(IV), (C) −(II), (D) −(I) (4) (A) −(II), (B) −(III), (C) −(IV), (D) −(I)

Q49.The rate constant for a first order reaction is 20 min−1 . The time required for the initial concentration of the reactant to reduce to its 1 level is ______ × 10−2 min . (Nearest integer) 32

Q49.Buna - S can be represented as: (1) (2) (3) (4) JEE Main 2023 (10 Apr Shift 2) JEE Main Previous Year Paper

Q49. A →B The above reaction is of zero order. Half life of this reaction is 50 min . The time taken for the concentration of A to reduce to one-fourth of its initial value is min . (Nearest integer)

Q49.The metal which is extracted by oxidation and subsequent reduction from its ore is : (1) Al (2) Ag (3) Cu (4) Fe

Q49.Consider the following reaction that goes from A to B in three steps as shown below: Choose the correct option Number of Rate Number of Activated determining Intermediates Complexes step (1) 2 3 I (2) 2 3 III (3) 2 3 II (4) 3 2 II (1) (1) (2) (2) (3) (3) (4) (4)

Q49.For certain chemical reaction X →Y , the rate of formation of product is plotted against the time as shown in the figure. The number of Correct statement/s from the following is _____ (A) Over all order of this reaction is one (B) Order of this reaction can't be determined (C) In region-I and III, the reaction is of first and zero order respectively (D) In region-II, the reaction is of first order (E) In region-II, the order of reaction is in the range of 0. 1 to 0. 9. JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper

Q49.The graph of log mx vs log p for an adsorption process is a straight line inclined at an angle of 45° with intercept equal to 0. 6020 . The mass of gas adsorbed per unit mass of adsorbent at the pressure of 0. 4 atm is JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper _____ ×10−1 (Nearest integer) Given : log 2 = 0. 3010

Q49.Compound X undergoes following sequence of reactions to give the Lactone Y. (1) (2) (3) (4)

Q49.The reaction 2NO + Br2 →2 NOBr takes place through the mechanism given below NO + Br2 ⇌NOBr2 (fast) NOBr2 + NO →2 NOBr (slow) The overall order of the reaction is _____.

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.Polymer used in orlon is: (1) Polyethene (2) Polycarbonate (3) Polyamide (4) Polyacrylonitrile

Q49.The correct representation in six membered pyranose form for the following sugar [X] is JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q49.What happens when a lyophilic sol is added to a lyophobic sol? (1) Film of lyophilic sol is formed over lyophobic (2) Lyophilic sol is dispersed in lyophobic sol sol (3) Film of lyophobic sol is formed over lyophilic (4) Lyophobic sol is coagulated sol