Practice Questions

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

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 : CH3 −O −CH2 −Cl will undergo SN1 reaction though it is a primary halide. Statement II : will not undergo SN2 reaction very easily though it is a primary halide. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both Statement I and Statement II are incorrect (2) Both Statement I and Statement II are correct (3) Statement I is incorrect but Statement II is (4) Statement I is correct but Statement II is correct incorrect

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.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.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

Q60.Propane molecule on chlorination under photochemical condition gives two di-chloro products, " x " and " y ". Amongst " x " and " y ", " x " is an optically active molecule. How many tri-chloro products (consider only structural isomers) will be obtained from " x " when it is further treated with chlorine under the photochemical condition? (1) 2 (2) 5 (3) 4 (4) 3

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

Q61.Given below are two statements about X-ray spectra of elements : Statement (I) : A plot of √v ( v = frequency of X -rays emitted) vs atomic mass is a straight line. Statement (II) : A plot of v(v = frequency of X -rays emitted) vs atomic number is a straight line. In the light of the above statements, choose the correct answer from the options given below : (1) Both Statement I and Statement II are true (2) Statement I is false but Statement II is true (3) Both Statement I and Statement II are false (4) Statement I is true but Statement II is false

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

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)

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.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.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.Given below are two statements : Statement (I) : A spectral line will be observed for a 2px →2py transition. Statement (II) : 2Px and 2py are degenerate orbitals. In the light of the above statements, choose the correct answer from the options given below : (1) Both Statement I and Statement II are true (2) Statement I is false but Statement II is true (3) Both Statement I and Statement II are false (4) Statement I is true but Statement II is false

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

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.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−

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

Q63.The major product of the following reaction is: CH3CH2CH = O → ? reflux (1) (2) (3) (4)

Q63. Given below are two statements : In the light of the above statements, choose the correct answer from the options given below : (1) Both Statement I and Statement II are true (2) Statement I is false but Statement II is true (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are false

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)