Practice Questions

Q52.Drug X becomes ineffective after 50% decomposition. The original concentration of drug in a bottle was 16mg/mL which becomes 4mg/mL in 12 months. The expiry time of the drug in months is __________ Assume that the decomposition of the drug follows first order kinetics. (1) 2 (2) 6 (3) 12 (4) 3

Q52.Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol Condensation D. Tollen's Test E. Clemmensen Reduction Choose the correct answer from the options given below: (1) A, B and D Only (2) C and E Only (3) A, C and E Only (4) B, C and D Only

Q52.The incorrect statements regarding geometrical isomerism are : (A) Propene shows geometrical isomerism. (B) Trans isomer has identical atoms/groups on the opposite sides of the double bond. (C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene. (D) 2-methylbut-2-ene shows two geometrical isomers. (E) Trans-isomer has lower melting point than cis isomer. Choose the correct answer from the options given below : (1) (A) and (E) Only (2) (A), (D) and (E) Only (3) (B) and (C) Only (4) (C), (D) and (E) Only

Q52.Match List - I with List - II. Choose the correct answer from the options given below : (1) (A) −(III), (B) −(I), (C) −(IV), (D) −(II) (2) (A) −(III), (B) −(I), (C) −(II), (D) −(IV) (3) (A) −(IV), (B) −(II), (C) −(III), (D) −(I) (4) (A) −(II), (B) −(IV), (C) −(I), (D) −(III)

Q52.Consider the following reactions K2Cr2O7 KOH→ [A] H2SO4→ [ B] + K2SO4 The products [A] and [B], −H2O −H2O respectively are : (1) K2CrO4 and CrO (2) K2CrO4 and Cr2O3 (3) K2CrO4 and K2Cr2O7 (4) K2Cr(OH)6 and Cr2O3

Q52.J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm. The final temperature and the change in internal energy respectively are: Given : R = 8.3 J K−1 mol−1 (1) 378 K and 500 J (2) 368 K and 500 J (3) 348 K and 300 J (4) 378 K and 300 J

Q52.Density of 3 M NaCl solution is 1.25 g/mL. The molality of the solution is : (1) 1.79 m (2) 2.79 m (3) 2 m (4) 3 m

Q52.The complex that shows Facial - Meridional isomerism is: (1) 1.[Co(en)2Cl2]+ (2) [Co(en)3]3+ (3) [Co(NH3)3Cl3] (4) [Co(NH3)4Cl2]+ Q53. +2.0v 0.8v −0.5v−−−FeO2−4 → Fe3+ → Fe2+ → Fe0 In the above diagram, the standard electrode potentials are given in volts (over the arrow). The value of EO is FeO2−4 /Fe2+ (1) 2.1 V (2) 1 .7 V (3) 1 .4 V (4) 1 .2 V

Q53.The effect of temperature on spontaneity of reactions are represented as : (1) (B) and (C) only (2) (B) and (D) only (3) (A) and (D) only (4) (A) and (C) only

Q53.The product (A) formed in the following reaction sequence is (1) (2) (3) (4)

Q53.Identify product [A], [B] and [C] in the following reaction sequence. (1) (2) (3) (4)

Q53. O2 gas will be evolved as a product of electrolysis of : (A) an aqueous solution of AgNO3 using silver electrodes. (B) an aqueous solution of AgNO3 using platinum electrodes. (C) a dilute solution of H2SO4 using platinum electrodes. (D) a high concentration solution of H2SO4 using platinum electrodes. Choose the correct answer from the options given below : (1) (A) and (C) only (2) (B) and (C) only (3) (A) and (D) only (4) (B) and (D) only

Q53.At temperature T, compound AB2( g) dissociates as AB2( g) ⇌AB(g) + 12 B2( g) having degree of dissociation x (small compared to unity). The correct expression for x in terms of Kp and p is 2025 (29 Jan Shift 1) JEE Main Previous Year Paper (1) 4√2Kpp (2) 3√2Kpp (3) 3√2 pK2p (4) √Kp

Q53.A liquid when kept inside a thermally insulated closed vessel at 25∘C was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters ? (1) ΔU < 0, q = 0, w > 0 (2) ΔU = 0, q = 0, w = 0 (3) ΔU > 0, q = 0, w > 0 (4) ΔU = 0, q < 0, w > 0

Q53.Which of the following oxidation reactions are carried out by both K2Cr2O7 and KMnO4 in acidic medium? A. Γ−→I2 B. S 2−→S C. Fe2+ →Fe3+ D. Γ−→IO3− E. S2O32−→SO42− Choose the correct answer from the options given below: (1) C, D and E Only (2) B, C and D Only (3) A, D and E Only (4) A, B and C Only

Q53.The correct order of the following complexes in terms of their crystal field stabilization energies is : (1) [Co(NH3)4]2+ < [Co(NH3)6]2+ < [Co(en)3]3+ < [Co(NH3)6]3+ (2) [Co(NH3)6]2+ < [Co(NH3)6]3+ < [Co(NH3)4]2+ < [Co(en)3]3+ (3) [Co(en)3]3+ < [Co(NH3)6]3+ < [Co(NH3)6]2+ < [Co(NH3)4]2+ (4) [Co(NH3)4]2+ < [Co(NH3)6]2+ < [Co(NH3)6]3+ < [Co(en)3]3+

Q54.An element ' E ′ has the ionisation enthalpy value of 374 kJ mol−1 . ' E ' reacts with elements A, B, C and D with electron gain enthalpy values of −328, −349, −325 and −295 kJ mol−1 , respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is : (1) ED > EC > EB > EA (2) EA > EB > EC > ED (3) EB > EA > EC > ED (4) ED > EC > EA > EB

Q54. Aman has been asked to synthesise the molecule (x).He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing ozonolysis reaction on alkene to produce a dicarbonyl compound followed by aldol reaction to prepare " x ". Predict the suitable alkene that can lead to the formation of " x ". 2025 (24 Jan Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q54.When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be : (1) Violet → Blue → Pale Blue → Green (2) Pale Blue → Blue → Green → Violet (3) Green → Pale Blue → Blue → Violet (4) Pale Blue → Blue → Violet → Green

Q54.The total number of compounds from below when treated with hot KMnO4 giving benzoic acid is : (1) 6 (2) 3 (3) 5 (4) 4

Q54.Which of the following electronegativity order is incorrect? (1) Mg < Be < B < N (2) S < Cl < O < F (3) Al < Si < C < N (4) Al < Mg < B < N

Q54.A molecule (" P ") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonolysis followed by reflux under alkaline condition gives (" R "). The structure of (" R ") is given below. The structure of (" P′′ ) is (1) (2) (3) (4) 2025 (28 Jan Shift 1) JEE Main Previous Year Paper

Q54.Identify the homoleptic complexes with odd number of d electrons in the central metal : (A) [FeO4]2− (B) [Fe(CN)6]3− (C) [Fe(CN)5NO]2− (D) [CoCl4]2− (E) [Co(H2O)3 F3] Choose the correct answer from the options given below : (1) (A), (B) and (D) only (2) (C) and (E) only (3) (B) and (D) only (4) (A), (C) and (E) only

Q55.Match the LIST-I with LIST-II Choose the correct answer from the options given below: (1) A-IV, B-I, C-III, D-II (2) A-IV, B-II, C-I, D-III (3) A-II, B-IV, C-III, D-I (4) A-III, B-II, C-I, D-IV

Q55.Total number of nucleophiles from the following is : ⊖ NH3, PhSH, (H3C)2 S, H2C = CH2, O H, H3O⊕, (CH3)2CO, ⇌NCH3 (1) 7 (2) 4 (3) 6 (4) 5