Practice Questions

Q65.Given below are two statements : Statement (I) : On nitration of m-xylene with HNO3, H2SO4 followed by oxidation, 4-nitrobenzene-1,3-dicarboxylic acid is obtained as the major product. Statement (II) : −CH3 group is o/p-directing while −NO2 group is m-directing group. In the light of the above statements, choose the correct answer from the options given below : 2025 (29 Jan Shift 2) JEE Main Previous Year Paper (1) Both Statement I and Statement II are false (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 true

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 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

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.Choose the correct statements. (A) Weight of a substance is the amount of matter present in it. (B) Mass is the force exerted by gravity on an object. (C) Volume is the amount of space occupied by a substance. (D) Temperatures below 0∘C are possible in Celsius scale, but in Kelvin scale negative temperature is not possible. (E) Precision refers to the closeness of various measurements for the same quantity. Choose the correct answer from the options given below : (1) (A), (D) and (E) Only (2) (C), (D) and (E) Only (3) (A), (B) and (C) Only (4) (B), (C) and (D) Only

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

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

Q66.Which among the following halides will generate the most stable carbocation in the nucleophilic substitution reaction? (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.What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass 256 g mol−1 ) and the decrease in freezing point is 0.40 K ? (1) 3.72 K kg mol−1 (2) 1.86 K kg mol−1 (3) 4.43 K kg mol−1 (4) 5.12 K kg mol−1 2025 (28 Jan Shift 1) JEE Main Previous Year Paper

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)

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

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.Given below are two statements: involving lone pair of electrons on nitrogen. In the light of the above statements, choose the most appropriate answer from the options given below (1) Statement I is incorrect but Statement II is (2) Statement I is correct but Statement II is correct incorrect (3) Both Statement I and Statement II are correct (4) Both Statement I and Statement II are incorrect

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.The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is : (1) Fe < Mn, Ru < Tc and Re < Os (2) Mn < Fe, Tc < Ru and Os < Re (3) Mn < Fe, Tc < Ru and Re < Os (4) Fe < Mn, Ru < Tc and Os < Re 2025 (29 Jan Shift 1) JEE Main Previous Year Paper

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.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.Given below are two statements : Statement (I) : It is impossible to specify simultaneously with arbitrary precision, both the linear momentum and the position of a particle. Statement (II) : If the uncertainty in the measurement of position and uncertainty in measurement of momentum are equal for an electron, then the 1 uncertainty in the measurement of velocity is . In the light of the above statements, choose the m ⩾√hπ × 2 correct answer from the options given below : (1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are false (3) Both Statement I and Statement II are true (4) Statement I is true but Statement II is false Q68.0.1 M solution of KI reacts with excess of H2SO4 and KIO3 solutions. According to equation 5I−+ IO−3 + 6H+ →3I2 + 3H2O Identify the correct statements : (A) 200 mL of KI solution reacts with 0.004 mol of KIO3 (B) 200 mL of KI solution reacts with 0.006 mol of H2SO4 (C) 0.5 L of KI solution produced 0.005 mol of I2 (D) Equivalent weight of KIO3 is equal to ( Molecular5 weight ) Choose the correct answer from the options given below : (1) (A) and (D) only (2) (C) and (D) only (3) (B) and (C) only (4) (A) and (B) only

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.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.The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of (1) Atomicity (2) Electron gain enthalpy (3) Electronegativity (4) Atomic size

Q68.Identify the inorganic sulphides that are yellow in colour : (A) (NH4)2 S (B) Pbs (C) Cus (D) As2 S3 (E) As2 S5 Choose the correct answer from the options given below : (1) (A), (D) and (E) only (2) (D) and (E) only (3) (A) and (B) only (4) (A) and (C) only