Practice Questions

Q59.The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is _____ .

Q59.Compoun ′B′ is (1) (2) (3) (4)

Q59.The product (P) formed from the following multistep reaction is: (1) (2) (3) (4)

Q59.The ratio of spin-only magnetic moment values 3 - + μeffCr ( CN ) 6 / μeffCrH2O63 is _______

Q59.The number of incorrect statement/s from the following is ______________ A. The successive half lives of zero order reactions decreases with time. B. A substance appearing as reactant in the chemical equation may not affect the rate of reaction C. Order and molecularity of a chemical reaction can be a fractional number JEE Main 2023 (10 Apr Shift 2) JEE Main Previous Year Paper D. The rate constant units of zero and second order reaction are molL -1 s-1 and mol-1 L s-1 respectively

Q59.A molecule undergoes two independent first order reactions whose respective half lives are 12 min and 3 min. If both the reactions are occurring then the time taken for the 50% consumption of the reactant is ______ min. (Nearest integer)

Q60.In an oligopeptide named Alanylglycylphenyl alanyl isoleucine, the number of sp2 hybridised carbons is _____. is equal to

Q60.An athlete is given 100 g of glucose (C6H12O6) for energy. This is equivalent to 1800 kJ of energy. The 50% of this energy gained is utilized by the athlete for sports activities at the event. In order to avoid storage of energy, the weight of extra water he would need to perspire is _____g (Nearest integer) Assume that there is no other way of consuming stored energy. Given : The enthalpy of evaporation of water is 45 kJ mol−1 Molar mass of C, H&O are 12.1 and 16 g mol−1 .

Q60.Number of cyclic tripeptides formed with 2 amino acids A and B is: (1) 2 (2) 3 (3) 5 (4) 4

Q60.Match the following Column −A Column −B a. Nylon 6 I. Natural Rubber b. Vulcanized Rubber II. Cross Linked c. cis −1, 4−polyisoprene III. Caprolactam d. Polychloroprene IV. Neoprene Choose the correct answer from options given below: (1) a →III, b →II, c →I, d →IV (2) a →III, b →IV, c →I, d →II (3) a →IV, b →III, c →II, d →I (4) a →II, b →III, c →IV, d →I ¯

Q60.How many of the transformation given below would result in aromatic amines? JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper

Q60.The difference in the oxidation state of Xe between the oxidised product of Xe formed on complete hydrolysis of XeF4and XeF4 is 2𝑧- 3𝑖

Q60.Following tetrapeptide can be represented as JEE Main 2023 (29 Jan Shift 2) JEE Main Previous Year Paper ( F, L, D, Y, I, Q, P are one letter codes for amino acids) (1) FIQY (2) FLDY (3) YQLF (4) PLDY

Q60.A. Ammonium salts produce haze in atmosphere. B. Ozone gets produced when atmospheric oxygen reacts with chlorine radicals. C. Polychlorinated biphenyls act as cleansing solvents. D. ‘Blue baby’ syndrome occurs due to the presence of excess of sulphate ions in water. JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper Choose the correct answer from the options given below:- (1) A, B and C only (2) B and C only (3) A and D only (4) A and C only

Q60.Total number of tripeptides possible by mixing of valine and proline is ________ .

Q60.Number of moles of AgCl formed in the following reaction is _____ . JEE Main 2023 (24 Jan Shift 1) JEE Main Previous Year Paper

Q60.A short peptide on complete hydrolysis produces 3 moles of glycine (G), two moles of leucine (L) and two moles of valine (V) per mole of peptide. The number of peptide linkages in it are _____ .

Q60.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): α-halocarboxylic acid on reaction with dil. NH3 gives good yield of α-amino carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides. Reason (R): Amino acids exist in zwitter ion form in aqueous medium. In the light of the above statements, choose the correct answer from the options given below : (1) Both (A) and (R) are correct and (R) is the (2) Both (A) and (R) are correct but (R) is not the correct explanation of (A). correct explanation of (A). (3) (A) is correct but (R) is not correct. (4) (A) is not correct but (R) is correct.

Q60.In potassium ferrocyanide, there are ______ pairs of electrons in the t2g set of orbitals. 2𝑧- 3𝑖

Q60.Given below are two statements: Statement I: Ethane at 333 to 343 K and 6 −7 atm pressure in the presence of AlEt3 and TiCl4 undergoes addition polymerization to give LDP. Statement II: Caprolactam at 533 −543 K in H2O through step growth polymerizes to give Nylon 6. In the light of the above statements, choose the correct answer from the options given below: (1) Statement I is false but Statement II is true (2) Statement I is true but Statement II is false (3) Both Statement I and Statement II are true (4) Both Statement I and Statement II are false

Q61.Let 𝛼, 𝛽 be the roots of the equation 𝑥2 - √2𝑥+ 2 = 0 Then 𝛼14 + 𝛽14 is equal to (1) -64 (2) -64√2 (3) -128 (4) -128√2

Q61.The number of real roots of the equation x|x| −5|x + 2| + 6 = 0 , is (1) 5 (2) 4 (3) 6 (4) 3 ¯ ¯

Q61.Let 𝑝, 𝑞∈ℝ and (1 - √3𝑖) 200 = 2199 (𝑝+ 𝑖𝑞), 𝑖= √-1. Then, 𝑝+ 𝑞+ 𝑞2 and 𝑝- 𝑞+ 𝑞2 are roots of the equation. (1) 𝑥2 + 4𝑥- 1 = 0 (2) 𝑥2 - 4𝑥+ 1 = 0 (3) 𝑥2 + 4𝑥+ 1 = 0 (4) 𝑥2 - 4𝑥- 1 = 0

Q62.If the set {Re ( 2−3z+5zz−z+zz ) : z ∈C, Re z = 3} is equal to the interval (α, β], then 24(β −α) is equal to (1) 36 (2) 27 (3) 30 (4) 42

Q62.For three positive integers 𝑝, 𝑞, 𝑟, 𝑥𝑝𝑞2 = 𝑦𝑞𝑟= 𝑧𝑝2𝑟 and 𝑟= 𝑝𝑞+ 1 such that 1 3, 3log𝑦𝑥, 3 log𝑧𝑦, 7log𝑥𝑧 are in A.P. with common difference 2. The 𝑟- 𝑝- 𝑞 is equal to (1) 2 (2) 6 (3) 12 (4) -6