Practice Questions

Q53.In the cumene to phenol preparation in presence of air, the intermediate is (1) (2) (3) (4)

Q53.The mismatched combinations are A. Chlorophyll – Co B. Water hardness – EDTA C. Photography −[Ag(CN)2]− D. Wilkinson catalyst −[(Ph3 P)3 RhCl] E. Chelating ligand –D−Penicillamine Choose the correct answer from the options given below. (1) A, C and E only (2) A and C only (3) A and E only (4) D and E only Q54. 2−Methyl propyl bromide reacts with C2H5O− and gives ‵A′ whereas on reaction with C2H5 OH it gives ‵B′. The mechanism followed in these reactions and the products ‵A′ and ‵B′ respectively are: (1) SN2, A =iso-butyl ethyl ether; SN1, B =tert-butyl (2) SN1, A =tert-butyl ethyl ether; SN1, B = 2− ethyl ether butyl ethyl ether (3) SN2, A = 2−butyl ethyl ether; SN2, B =iso- (4) SN1, A =tert-butyl ethyl ether; SN2, B =iso- butyl ethyl ether butyl ethyl ether

Q53.At constant temperature, a gas is at a pressure of 940 . 3 mm Hg. The pressure at which its volume decreases by 40% is ______ mm Hg. (Nearest integer) +2 . 2 V +0 . 70 V -0 . 45 V 2 - ⟶ Fe3 + ⟶ Fe2 + ⟶ Fe0

Q53.The hybridization and magnetic behaviour of cobalt ion in [Co(NH3)6]3+ complex, respectively is (1) sp3 d2 and diamagnetic (2) d2 sp3 and paramagnetic (3) d2 sp3 and diamagnetic (4) sp3 d2 and paramagnetic

Q53.If the CFSE of [Ti (H2O)6]3+ is −96. 0 kJ / mol, this complex will absorb maximum at wavelength nm. (nearest integer) Assume Planck' constant (h) = 6. 4 × 10−34 Js, Speed of light (c) = 3. 0 × 108 m/s and Avogadro's constant (NA) = 6 × 1023/ mol. JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper

Q53.Match List I with List II: List I List II (Complexes) (Hybridisation) (A) [Ni(CO)4] I sp3 (B) [Cu (NH3)4]2+ II dsp2 (C) [Fe (NH3)6]2+ III sp3 d2 (D) [Fe (H2O)6]2+ IV d2 sp3 (1) A – II, B – I, C – III, D – IV (2) A – I, B – II, C – III, D – IV (3) A – II, B – I, C – IV, D – III (4) A – I, B– II, C – IV, D – III Q54. 1 L, 0. 02M solution of [Co (NH3)5 SO4] Br is mixed with 1 L, 0. 02M solution of [Co (NH3)5 Br] SO4 . The resulting solution is divided into two equal parts (X) and treated with excess AgNO3 solution and BaCl2 solution respectively as shown below: 1 L Solution (X) + AgNO3 solution (excess) →Y 1 L Solution (X) + BaCl2 solution (excess) →Z The number of moles of Y and Z respectively are (1) 0. 02, 0. 02 (2) 0. 01, 0. 01 (3) 0. 02, 0. 01 (4) 0. 01, 0. 02

Q53.At 25°C, the enthalpy of the following processes are given: H2 ( g) + O2 ( g) →2OH(g)𝛥Ho = 78 kJ mol-1 H2 ( g) + 1 / 2O2 ( g) →H2O(g)𝛥H0 = - 242 kJ mol-1 H2 ( g) →2H(g)𝛥Ho = 436 kJ mol-1 1 / 2O2 ( g) →O(g)𝛥H0 = 249 kJ mol-1 What would be the value of X for the following reaction? (Nearest integer) JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper H2Og →Hg + OHg ∆Ho = X kJmol-1

Q53.Element not present in Nessler’s reagent is (1) N (2) Hg (3) I (4) K

Q53.A mixture of one mole of H2O and 1 mole of CO is taken in a 10 litre container and heated to 725 K. At equilibrium 40% of water by mass reacts with carbon monoxide according to the equation: COg + H2Og ⇌ CO2g + H2g. The equilibrium constant KC × 102 for the reaction is ________ (Nearest integer)

Q53.The denticity of the ligand present in the Fehling's reagent is _____ .

Q54.See the following chemical reaction: Cr2O72 - + XH+ + 6Fe2 + →YCr3 + + 6Fe3 + + ZH2O The sum of X, Y and Z is

Q54.The vapour pressure of 30% (w/v), aqueous solution of glucose is ________ mm Hg at 25∘C . JEE Main 2023 (15 Apr Shift 1) JEE Main Previous Year Paper [Given: The density of 30% (w/v), aqueous solution of glucose is 1. 2 g cm–3 and vapour pressure of pure water is 24 mm Hg.] (Molar mass of glucose is 180 g mol–1 )

Q54.In the following reaction (1) (2) (3) (4)

Q54.Uracil is base present in RNA with the following structure. % of N in uracil is _______.

Q54.Match List I with List II LIST-I LIST-II Complex Colour JEE Main 2023 (11 Apr Shift 2) JEE Main Previous Year Paper A. Mg(NH4) PO4 I. brown B. K3[Co (NO2)6] II. white C. MnO (OH)2 III. yellow D. Fe4 [Fe (CN)6]3 IV. blue Choose the correct answer from the options given below: (1) A-III, B-IV, C-II, D-I (2) A-II, B-III, C-I, D-IV (3) A-II, B-IV, C-I, D-III (4) A-II, B-III, C-IV, D-I

Q54. The number of hyperconjugation structures involved to stabilize carbocation formed in the above reaction is __________.

Q54.(i) X(g) ⇌Y(g) + Z(g) Kp1 = 3 (ii) A(g) ⇌2 B( g) Kp2 = 1 If the degree of dissociation and initial concentration of both the reactants X ( g ) and A ( g ) are equal, then 𝑝1 the ratio of the total pressure at equilibrium is equal to x: 1. The value of x is (Nearest integer) 𝑝2

Q54.A ( g ) ⇌2 B ( g ) + C ( g ) For the given reaction, if the initial pressure is 450 mmHg and the pressure at time t is720 mmHg at a constant temperatureT and constant volume V. The fraction of A ( g ) decomposed under these conditions is x × 10-1. The value of x is (nearest integer)

Q54.The complex cation which has two isomers is: (1) [Co (H2O)6]3+ (2) [Co (NH3)5 Cl]2+ (3) [Co (NH3)5 NO2]2+ (4) [Co (NH3)5 Cl]+

Q54.For reaction: SO2 ( g) + 12O2 the same reaction is × 1013 . ( Nearest integer) (Given R = 0 . 082 L atm K-1 mol-1 )

Q54.The value of log K for the reaction A ⇌B at 298 K is _______ . (Nearest integer) Given: 𝛥H° = - 54 . 07 kJ mol-1 𝛥S° = 10JK-1 mol-1 (Taken 2 . 303 × 8 . 314 × 298 = 5705 )

Q54.A 300mL bottle of soft drink has 0 . 2MCO2 dissolved in it. Assuming CO2 behaves as an ideal gas, the volume of the dissolved CO2 at STP is _____ mL. (Nearest integer) Given: At STP, molar volume of an ideal gas is 22 . 7L mol-1

Q54.In the following reaction, ‘ B’ is (1) (2) (3) (4)

Q54.The one giving maximum number of isomeric alkenes on dehydrohalogenation reaction is (excluding rearrangement) (1) 1-Bromo- 2 -methylbutane (2) 2-Bromopropane (3) 2-Bromopentane (4) 2-Bromo- 3, 3-dimethylpentane

Q54.The sum of bridging carbonyls in W(CO)6 and Mn2 (CO)10 is _____ .