Practice Questions

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.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

Q60.The purification method based on the following physical transformation is : (1) Distillation (2) Extraction (3) Sublimation (4) Crystallization

Q60.Identify the essential amino acids from below : (A) Valine (B) Proline (C) Lysine (D) Threonine (E) Tyrosine Choose the correct answer from the options given below : (1) (A), (C) and (E) only (2) (A), (C) and (D) only (3) (C), (D) and (E) only (4) (B), (C) and (E) only

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.The elemental composition of a compound is 54.2%C, 9.2%H and 36.6%O. If the molar mass of the compound is 132 g mol−1 , the molecular formula of the compound is : [Given : The relative atomic mass of C : H : O = 12 : 1 : 16 ] (1) C4H9O3 (2) C6H12O6 (3) C4H8O2 (4) C6H12O3

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.The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity. (1) E⊖ = +1.67 V (2) E⊖ = +1.15 V Pb4+/Pb2+ Sn4+/Sn2+ (3) E⊖ = −1.66 V (4) E⊖T1/Tl/2.26 V Al3+/Al

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 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. CrCl3 ⋅xNH3 can exist as a complex. 0.1 molal aqueous solution of this complex shows a depression in freezing point of 0.558∘C. Assuming 100% ionisation of this complex and coordination number of Cr is 6 , the complex will be (Given Kf = 1.86 K kg mol−1 ) (1) [Cr(NH3)5Cl]Cl2 (2) [Cr(NH3)6]Cl3 (3) [Cr(NH3)3Cl3] (4) [Cr(NH3)4Cl2]Cl

Q61. Ksp for Cr(OH)3 is 1.6 × 10−30 . What is the molar solubility of this salt in water? (1) 1.8×10−30 (2) 5√1.8 × 10−30 27 × 10−30 (3) 4√1.6×10−3027 (4) 2√1.6

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.Which of the following is/are not correct with respect to energy of atomic orbitals of hydrogen atom? (A) 1 s < 2p < 3 d < 4 s (B) 1 s < 2 s = 2p < 3 s = 3p (C) 1 s < 2 s < 2p < 3 s < 3p (D) 1 s < 2 s < 4 s < 3 d 2025 (28 Jan Shift 2) JEE Main Previous Year Paper Choose the correct answer from the options given below : (1) (A) and (C) only (2) (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

Q62.Which of the following statement is not true for radioactive decay? (1) Decay constant increases with increase in (2) Amount of radioactive substance remained after temperature. three half lives is 1 th of original amount. 8 (3) Decay constant does not depend upon (4) Half life is ln 2 times of rate constant1 . temperature.

Q62.In the given structure, number of sp and sp2 hybridized carbon atoms present respectively are : (1) 4 and 5 (2) 3 and 5 (3) 3 and 6 (4) 4 and 6 2025 (24 Jan Shift 2) JEE Main Previous Year Paper

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.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. 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−