Practice Questions

Q52.The incorrect statement regarding the reaction given below is (1) The product ‘ B’ formed in the above reaction is p (2) ‘ B’ is N-nitroso ammonium compound -nitroso compound at low temperature (3) The reaction occurs at low temperature (4) The electrophile involved in the reaction is NO+ JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper

Q52.The sum of lone pairs present on the central atom of the interhalogen IF5 and IF7 is ______

Q52.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Cu2+ in water is more stable than Cu+ . Reason (R) : Enthalpy of hydration for Cu2+ is much less than that of Cu+ . 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) (A) is correct but (R) is not correct. 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).

Q52.Electrons in a cathode ray tube have been emitted with a velocity of 1000 ms-1. The number of following statements which is/are true about the emitted radiation is Given : h = 6 × 10-34Js, me = 9 × 10-31 kg (A ) The deBroglie wavelength of the electron emitted is 666 . 67 nm (B ) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube. (C) The cathode rays start from cathode and move towards anode. (D ) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube..

Q52.The ratio of sigma and π bonds present in pyrophosphoric acid is

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.Total number of moles of AgCl precipitated on addition of excess of AgNO3 to one mole each of the following complexes [Co (NH3)4 Cl2] Cl, [Ni (H2O)6] Cl2, [Pt (NH3)2 Cl2] and [Pd (NH3)4] Cl2 is

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

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.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.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.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.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.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 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.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.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.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]+

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.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.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.The observed magnetic moment of the complex [Mn(NCS)6)]x− is 6. 06 BM. The numerical value of x is

Q54.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Acetal/Ketal is stable in basic medium. Reason R: The high leaving tendency of alkoxide ion gives the stability to acetal/ketal in basic medium. In the light of the above statements, choose the correct answer from the options given below: (1) A is true but R is false (2) A is false but R is true (3) Both A and R are true and R is the correct (4) Both A and R are true but R is NOT the correct explanation of A explanation of A