Practice Questions

Q58.For a reaction, N2O5( g) →2NO2( g) + 12 O2( g) in a constant volume container, no products were present initially. The final pressure of the system when 50% of reaction gets completed is (1) 5 times of initial pressure (2) 5/2 times of initial pressure (3) 7/2 times of initial pressure (4) 7/4 times of initial pressure

Q59.The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed ? (1) A small decrease in molar conductivity is (2) Molar conductivity decreases sharply with observed at infinite dilution. increase in concentration. (3) A small increase in molar conductivity is (4) Molar conductivity increases sharply with observed at infinite dilution. increase in concentration.

Q59.Which one of the following reaction sequences will give an azo dye? 2025 (29 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q59.The molecules having square pyramidal geometry are (1) BrF5&PCl5 (2) SbF5&PCl5 (3) SbF5&XeOF4 (4) BrF5&XeOF4

Q59.Arrange the following in increasing order of solubility product : Ca(OH)2, AgBr, PbS, HgS (1) HgS < AgBr < PbS < Ca(OH)2 (2) Ca(OH)2 < AgBr < HgS < PbS (3) PbS < HgS < Ca(OH)2 < AgBr (4) HgS < PbS < AgBr < Ca(OH)2

Q59.Identify the homoleptic complex(es) that is/are low spin. (A) [Fe(CN)5NO]2− (B) [CoF6]3− (C) [Fe(CN)6]4− (D) [Co(NH3)6]3+ (E) [Cr(H2O)6]2+ Choose the correct answer from the options given below : (1) (C) only (2) (C) and (D) only (3) (A) and (C) only (4) (B) and (E) only 2025 (22 Jan Shift 2) JEE Main Previous Year Paper

Q59.Given below are two statements: Statement I: In Lassaigne's test, the covalent organic molecules are transformed into ionic compounds. Statement II: The sodium fusion extract of an organic compound having N and S gives prussian blue colour with FeSO4 and Na4 [Fe(CN)6] In the light of the above statements, choose the correct answer from the options given below. (1) Statement I is true but Statement II is false (2) Both Statement I and Statement II are false (3) Both Statement I and Statement II are true (4) Statement I is false but Statement II is true

Q59.One mole of the octahedral complex compound Co(NH3)5Cl3 gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of AgNO3 solution to yield two moles of AgCl(s) . The structure of the complex is: (1) [Co(NH3)4Cl2] ⋅Cl ⋅NH3 (2) [Co(NH3)3Cl3] ⋅2NH3 (3) [Co(NH3)5Cl]Cl2 (4) [Co(NH3)4Cl] ⋅Cl2 ⋅NH3

Q60.Consider the following elements In, Tl, Al, Pb, Sn and Ge . The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are (1) +4 and +1 (2) +1 and +4 (3) +4 and +3 (4) +2 and +3 2025 (28 Jan Shift 1) JEE Main Previous Year Paper

Q60.Which of the following ions is the strongest oxidizing agent? (Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71 ) 2025 (24 Jan Shift 1) JEE Main Previous Year Paper (1) Eu2+ (2) Tb4+ (3) Lu3+ (4) Ce3+

Q60.Given below are the atomic numbers of some group 14 elements. The atomic number of the element with lowest melting point is : (1) 6 (2) 82 (3) 14 (4) 50

Q61. For a given reaction R →P, t1/2 is related to [A]0 as given in table. Given: log 2 = 0.30 Which of the following is true? A. The order of the reaction is 1/2. B. If [A]0 is 1 M , then t1/2 is 200√10 min C. The order of the reaction changes to 1 if the concentration of reactant changes from 0.100 M to 0.500 M . D. t1/2 is 800 min for [A]0 = 1.6M Choose the correct answer from the options given below: Options (1) A and C Only (2) A, B and D Only (3) C and D Only (4) A and B Only

Q61.Match List-I with List-II. List −I cList −II (A) Al3+ < Mg2+ < Na+ < F− (I) IonisationEnthalpy (B) B < C < O < N (II) Metalliccharacter (C) B < Al < Mg < K (III) Electronegativity (D) Si < P < S < Cl (IV ) Ionicradii 2025 (22 Jan Shift 1) JEE Main Previous Year Paper Choose the correct answer from the options given below : (1) (A)-(IV), (B)-(I), (C)-(II), (D)-(III) (2) (A)-(IV), (B)-(I), (C)- (III), (D)-(II) (3) (A)-(III), (B)-(IV), (C)- (II), (D)-(I) (4) (A)-(II), (B)-(III), (C)-(IV), (D)-(I)

Q61.The product (P) formed in the following reaction is : (1) (2) (3) (4) 2025 (29 Jan Shift 1) JEE Main Previous Year Paper

Q61.The conditions and consequence that favours the t2ggeg1 configuration in a metal complex are (1) weak field ligand, low spin complex (2) weak field ligand, high spin complex (3) strong field ligand, high spin complex (4) strong field ligand, low spin complex

Q61.The calculated spin-only magnetic moments of K3 [Fe(OH)6] and K4 [Fe(OH)6] respectively are : (1) 3.87 and 4.90 B.M. (2) 4.90 and 5.92 B.M. (3) 4.90 and 4.90 B.M. (4) 5.92 and 4.90 B.M.

Q61.Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde. (1) four (2) one (3) two (4) three

Q62.Which of the following happens when NH4OH is added gradually to the solution containing 1 M A2+ and 1MB3+ ions? Given : Ksp [A(OH)2] = 9 × 10−10 and Ksp [B(OH)3] = 27 × 10−18 at 298 K . (1) Both A(OH)2 and B(OH)3 do not show (2) A(OH)2 will precipitate before B(OH)3 precipitation with NH4OH (3) B(OH)3 will precipitate before A(OH)2 (4) A(OH)2 and B(OH)3 will precipitate together excess HCHO alkali−

Q62.Match the LIST-I with LIST-II Choose the correct answer from the options given below: (1) A-II, B-III, C-I, D-IV (2) A-III, B-IV, C-I, D-II (3) A-IV, B-I, C-II, D-III (4) A-II, B-III, C-IV, D-I

Q62.If a0 is denoted as the Bohr radius of hydrogen atom, then what is the de-Broglie wavelength (λ) of the electron present in the second orbit of hydrogen atom? [n : any integer] (1) 8πa0 (2) 2a0 n nπ (3) 4n (4) 4πa0 πa0 n

Q62. HNO3 H2SO4 (1) Ammoniumacetate −−−Identify A, B and C in the given below reaction sequence A → Pb(NO3)2 → B → (2) Acetic acid (3) K2CrO4 (1) PbCl2, PbSO4, PbCrO4 (2) PbS, PbSO4, Pb(CH3COO)2 (3) PbCl2, Pb(SO4)2, PbCrO4 (4) PbS, PbSO4, PbCrO4

Q62.Consider an elementary reaction A(g) + B(g) →C(g) + D(g) If the volume of reaction mixture is suddenly reduced to 1 of its initial volume, the reaction rate will become ' x ' times of the original reaction rate. The 3 value of x is : (1) 3 (2) 19 (3) 9 (4) 13

Q62.Which of the following statements are NOT true about the periodic table? A. The properties of elements are function of atomic weights. B. The properties of elements are function of atomic numbers. C. Elements having similar outer electronic configurations are arranged in same period. D. An element's location reflects the quantum numbers of the last filled orbital. E. The number of elements in a period is same as the number of atomic orbitals available in energy level that is being filled. Choose the correct answer from the options given below: (1) A, C and E Only (2) A and E Only (3) B, C and E Only (4) D and E Only

Q63. Match List - I with List - II. Choose the correct answer from the options given below : (1) (A)-(II), (B)-(III), (C)-(IV), (D)-(I) (2) (A)-(II), (B)-(III), (C)-(I), (D)-(IV) (3) (A)-(III), (B)-(II), (C)-(I), (D)-(IV) (4) (A)-(III), (B)-(II), (C)-(IV), (D)-(I)

Q63.The product B formed in the following reaction sequence is : (1) (2) (3) (4)