Practice Questions

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.If Ni2+ is replaced by Pt2+ in the complex [NiCl2 Br2]2− , which of the following properties are expected to get changed? A. Geometry B. Geometrical isomerism C. Optical isomerism D. Magnetic properties (1) A and D (2) A, B and C (3) B and C (4) A, B and D

Q53.The total change in the oxidation state of manganese involved in the reaction of KMnO4 and potassium iodide in the acidic medium is ________.

Q53.Which of the following complex is octahedral, diamagnetic and the most stable? (1) Na3[CoCl6] (2) [Ni (NH3)6] Cl2 (3) K3[Co(CN)6] (4) [Co (H2O)6] Cl2

Q53.Match List-I with List-II LIST-I LIST-II Coordination Number of unpaired electrons Complex A. [Cr(CN)6]3− I. 0 B. [Fe (H2O)6]2+ II. 3 C. [Co (NH3)6]3+ III. 2 JEE Main 2023 (08 Apr Shift 2) JEE Main Previous Year Paper D. [Ni (NH3)6]2+ IV. 4 Choose the correct answer from the options given below: (1) A-II, B-IV, C-I, D-III (2) A-III, B-IV, C-I, D-II (3) A-II, B-I, C-IV, D-III (4) A-IV, B-III, C-II, D-I

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.The enthalpy change for the conversion of 1 (g) to Cl- ( aq ) is ( - ) 2Cl2 kJmol-1 (Nearest integer) JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper Given : 𝛥dis HCl20 ( g ) = 240kJmol-1. 𝛥egHClo ( g ) = - 350kJmol-1, - = - 380kJmol-1 𝛥hydHClo ( g ) ( g) ⇌SO3 ( g) KP = 2 × 1012 at 27°C and 1 atm pressure. The Kc for

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

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

Q53.The number of molecules from the following which contain only two lone pair of electrons is _____________ H2O, N2, CO, XeF4, NH3, NO, CO2, F2

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

Q53.Chiral complex from the following is : Here en = ethylene diamine (1) cis −[PtCl2(en)2]2+ (2) trans −[PtCl2(en)2]2+ (3) cis −[PtCl2 (NH3)2] (4) trans −[Co (NH3)4 Cl2]+

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 dissociation constant of acetic is x × 10 – 5 . When 25 mL of 0 . 2 M CH3COONa solution is mixed with 25 mL of 0 . 02 M CH3COOH solution, the pH of the resultant solution is found to be equal to 5. The value of x is _______.

Q53.Which element is not present in Nessler’s reagent? (1) Mercury (2) Potassium (3) Iodine (4) Oxygen

Q53.Match List I with List II List I Complex List II CFSE (Δ0) A. [Cu(NH3)6]2+ I. −0. 6 B. [Ti(H2O)6]3+ II. −2. 0 C. [Fe(CN)6]3− III. −1. 2 D. [NiF6]4− IV. −0. 4 Choose the correct answer from the options given below: (1) A(III), B(IV), C(I), D(II) (2) A(I), B(IV), C(II), D(III) (3) A(I), B(II), C(IV), D(III) (4) A(II), B(III), C(I), D(IV)

Q53.The number of species from the following which have square pyramidal structure is _______ PF5, BrF4- , IF5, BrF5, XeOF4, ICl4-

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.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

Q54.Maximum number of isomeric monochloro derivatives which can be obtained from 2,2,5,5- tetramethylhexane by chlorination is _________

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

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

Q54.FeO4 θ EFeO42 - / Fe2 + is x × 10-3 V. The value of x is _______