Practice Questions

Q58. List - I List - II (Carbohydrate) (Linkage Source) (A) Amylose (I) β −C1 −C4, plant Match List - I with List - II. Choose the (B) Cellulose (II) α −C1 −C4, animal (C) Glycogen (III) α −C1 −C4, α −C1 −C6, plant (D) Amylopectin (IV) α −C1 −C4, plant correct answer from the options given below : (1) (A)-(IV), (B)-(I), (C)-(III), (D)-(II) (2) (A)-(III), (B)-(II), (C)-(I), (D)-(IV) (3) (A)-(II), (B)-(III), (C)-(I), (D)-(IV) (4) (A)-(IV), (B)-(I), (C)-(II), (D)-(III)

Q58.The amphoteric oxide among V2O3, V2O4 and V2O5 , upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is : (1) +3 (2) +4 (3) +7 (4) +5

Q59.Find the compound ' A ' from the following reaction sequences. A aqua-regia→ B (1) KNO2∣NH4OH→ yellow ppt (2) AcOH (1) CoS (2) ZnS (3) NiS (4) MnS

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.The α-Helix and β - Pleated sheet structures of protein are associated with its : (1) tertiary structure (2) quaternary structure (3) secondary structure (4) primary structure ∣∣∣ ∣∣∣ ∣∣∣ ∣∣ 2025 (23 Jan Shift 2) JEE Main Previous Year Paper

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

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.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 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.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.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

Q60.Which of the following acids is a vitamin? (1) Adipic acid (2) Ascorbic acid (3) Saccharic acid (4) Aspartic acid

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

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.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

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.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

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. 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.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 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. 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