Practice Questions

Q64.Ice at −5∘C is heated to become vapor with temperature of 110∘C at atmospheric pressure. The entropy change associated with this process can be obtained from 2025 (23 Jan Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q65.The incorrect statement among the following is options 1 . (1) PH3 shows lower proton affinity than NH3 . (2) SO2 can act as an oxidizing agent, but not as a reducing agent. (3) PF3 exists but NF5 does not. (4) NO2 can dimerise easily. Q66. 2.8 × 10−3 mol of CO2 is left after removing 1021 molecules from its ' x ' mg sample. The mass of CO2 taken initially is Given: NA = 6.02 × 1023 mol−1 (1) 98 .3 mg (2) 48.2 mg (3) 196 .2 mg (4) 150 .4 mg

Q65.The ascending order of relative rate of solvolysis of following compounds is : (1) (C) < (B) < (A) < (D) (2) (D) < (A) < (B) < (C) (3) (D) < (B) < (A) < (C) (4) (C) < (D) < (B) < (A) 2025 (23 Jan Shift 2) JEE Main Previous Year Paper

Q65.Which one of the carbocations from the following is most stable? (1) (2) (3) (4) 2025 (24 Jan Shift 1) JEE Main Previous Year Paper

Q65. The compounds that produce CO2 with aqueous NaHCO3 solution are: A. B. C. D. E. Choose the correct answer from the options given below: (1) A, C and D Only (2) A, B and E Only (3) A and C Only (4) A and B Only

Q65.The structure of the major product formed in the following reaction is : 2025 (24 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q65.The alkane from below having two secondary hydrogens is : (1) 4-Ethyl-3,4-dimethyloctane (2) 2,2,3,3-Tetramethylpentane (3) 2,2,4,5-Tetramethylheptane (4) 2,2,4,4-Tetramethylhexane

Q65.A vessel at 1000 K contains CO2 with a pressure of 0.5 atm . Some of CO2 is converted into CO on addition of graphite. If total pressure at equilibrium is 0.8 atm , then Kp is : (1) 1.8 atm (2) 0.3 atm (3) 3 atm (4) 0.18 atm

Q66.When sec-butylcyclohexane reacts with bromine in the presence of sunlight, the major product is : (1) (2) (3) (4)

Q66. Match List - I with List - II. Choose the correct answer from the options given below : (1) (A)-(IV), (B)-(II), (C)-(I), (D)-(III) (2) (A)-(I), (B)-(II), (C)-(III), (D)-(IV) (3) (A)-(III), (B)-(I), (C)-(IV), (D)-(II) (4) (A)-(II), (B)-(IV), (C)-(III), (D)-(I)

Q66.Match List - I with List - II. List −I List −II (A) Bronze (I) Cu, Ni (B) Brass (II) Fe, Cr, Ni, C (C) UKsilvercoin (III) Cu, Zn (D) Stainlesssteel (IV ) Cu, Sn Choose the correct answer from the options given below : (1) (A)-(IV), (B)-(II), (C)-(III), (D)-(I) (2) (A)-(IV), (B)-(III), (C)-(I), (D)-(II) (3) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) (4) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Q66.Following are the four molecules "P", "Q", "R" and "S". Which one among the four molecules will react with H −Br(aq) at the fastest rate? (1) R (2) P (3) Q (4) S

Q66.A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A . The amount of the aluminium deposited at the cathode is [Given : molar mass of aluminium and chlorine are 27 g mol−1 and 35.5 g mol−1 respectively. Faraday constant = 96500Cmol−1] (1) 1.660 g (2) 0.336 g (3) 0.441 g (4) 1.007 g 2025 (22 Jan Shift 1) JEE Main Previous Year Paper

Q66.Which among the following halides will generate the most stable carbocation in the nucleophilic substitution reaction? (1) (2) (3) (4)

Q66. For reaction The correct order of set of reagents for the above conversion is : (1) Br2 ∣FeBr3, H2O(Δ), NaOH (2) H2SO4, Ac2O, Br2, H2O(Δ), NaOH (3) Ac2O, Br2, H2O(Δ), NaOH (4) Ac2O, H2SO4, Br2, NaOH

Q67.The most stable carbocation from the following is : 2025 (22 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q67.The successive 5 ionisation energies of an element are 800, 2427, 3658, 25024 and 32824 kJ/mol, respectively. By using the above values predict the group in which the above element is present : (1) Group 13 (2) Group 14 (3) Group 2 (4) Group 4 2025 (24 Jan Shift 2) JEE Main Previous Year Paper

Q67. The IUPAC name of the following compound is : (1) Methyl-6-carboxy-2,5-dimethylhexanoate. (2) 2-Carboxy-5-methoxycarbonylhexane. (3) 6-Methoxycarbonyl-2,5-dimethylhexanoic acid. (4) Methyl-5-carboxy-2-methylhexanoate.

Q67.For the given cell Fe2+ (aq) + Ag+ (aq) →Fe3+(aq) + Ag(s) The standard cell potential of the above reaction is Ag+ + e−→Ag Eθ = xV Given: Fe2+ + 2e−→Fe Eθ = yV Fe3+ + 3e−→Fe Eθ = zV (1) x + y −z (2) x + 2y (3) x + 2y −3z (4) y −2x

Q67.Match the 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-II, B-III, C-I, D-IV (3) A-IV, B-I, C-III, D-II (4) A-IV, B-III, C-I, D-II

Q67. Choose the correct answer from the options given below : (1) (A)-(I), (B)-(IV), (C)-(III), (D)-(II) (2) (A)-(III), (B)-(II), (C)-(I), (D)-(IV) (3) (A)-(III), (B)-(IV), (C)-(I), (D)-(II) (4) (A)-(II), (B)-(III), (C)-(I), (D)-(IV)

Q68.For a Mg Mg2+(aq) Ag+(aq) Ag the correct Nernst Equation is : [Ag+] [Ag+]2 (1) (2) Ecell = Eocell −RT2 F ln [Mg2+] Ecell = Eocell + RT2 F ln [Mg2+] (3) [Ag+]2 (4) [Mg2+] cell −RT2 F ln [Ag+] Ecell = Eocell −RT2 F ln [Mg2+] Ecell = Eo

Q68.pH of water is 7 at 25∘C. If water is heated to 80∘C., it's pH will : (1) Decrease (2) H+ concentration increases, OH− concentration decreases (3) Remains the same (4) Increase 2025 (23 Jan Shift 2) JEE Main Previous Year Paper

Q68. Choose the correct answer from the options given below : (1) (A)-(IV), (B)-(III), (C)-(II), (D)-(I) (2) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) (3) (A)-(III), (B)-(IV), (C)-(I), (D)-(II) (4) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Q68.Heat treatment of muscular pain involves radiation of wavelength of about 900 nm . Which spectral line of H atom is suitable for this? Given : Rydberg constant RH = 105 cm−1, h = 6.6 × 10−34 J s, c = 3 × 108 m/s ) (1) Balmer series, ∞→2 (2) Lyman series, ∞→1 (3) Paschen series, ∞→3 (4) Paschen series, 5 →3