Practice Questions

Q62.The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is : (1) A2O (2) A2O3 (3) AO2 (4) AO

Q63.The major product of the following reaction is: CH3CH2CH = O → ? reflux (1) (2) (3) (4)

Q63. Match List - I with List - II. Choose the correct answer from the options given below : (1) (A)-(II), (B)-(III), (C)-(IV), (D)-(I) (2) (A)-(II), (B)-(III), (C)-(I), (D)-(IV) (3) (A)-(III), (B)-(II), (C)-(I), (D)-(IV) (4) (A)-(III), (B)-(II), (C)-(IV), (D)-(I)

Q63.Total number of sigma ( σ ) and pi(π) bonds respectively present in hex-1-en-4-yne are : (1) 3 and 13 (2) 11 and 3 (3) 13 and 3 (4) 14 and 3

Q63.Given below are two statements : Statement (I) : The boiling points of alcohols and phenols increase with increase in the number of C-atoms. Statement (II) : The boiling points of alcohols and phenols are higher in comparison to other class of compounds such as ethers, haloalkanes. In the light of the above statements, choose the correct answer from the options given below : (1) Both Statement I and Statement II are false (2) Both Statement I and Statement II are true (3) Statement I is false but Statement II is true (4) Statement I is true but Statement II is false

Q63.The product B formed in the following reaction sequence is : (1) (2) (3) (4)

Q63.Given below are two statements: Statement I: In the oxalic acid vs KMnO4 (in the presence of dil H2SO4 ) titration the solution needs to be heated initially to 60∘C, but no heating is required in Ferrous ammonium sulphate (FAS) vs KMnO4 titration (in the presence of dil H2SO4 ) Statement II: In oxalic acid vs KMnO4 titration, the initial formation of MnSO4 takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs KMnO4 , heating oxidizes Fe2+ into Fe3+ by oxygen of air and error may be introduced in the experiment. In the light of the above statements, choose the correct answer from the options given below (1) Both Statement I and Statement II are false (2) Both Statement I and Statement II are true (3) Statement I is false but Statement II is true (4) Statement I is true but Statement II is false 2025 (28 Jan Shift 1) JEE Main Previous Year Paper

Q63.Given below are two statements I and II. Statement I: Dumas method is used for estimation of "Nitrogen" in an organic compound. Statement II: Dumas method involves the formation of ammonium sulphate by heating the organic compound with conc H2SO4 . 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) Statement I is false but Statement II is true (4) Both Statement I and Statement II are true

Q63. The products formed in the following reaction sequence are : (1) (2) , CH3 −CHO , CH3 −COOH (3) (4) , CH3 −CHO

Q63.Given below are two statements : Statement (I) : An element in the extreme left of the periodic table forms acidic oxides. Statement (II) : Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table. 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 true (3) Both Statement I and Statement II are false (4) Statement I is false but Statement II is true 2025 (22 Jan Shift 2) JEE Main Previous Year Paper

Q64.The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is (1) Mn2+ (2) Cr3+ (3) Ni2+ (4) Ti3+

Q64. A2k1 A + A (fast) k−1 The reaction A2 + B2 →2AB follows the mechanism k2 The overall order of the −A + B2 → AB + B (slow) A + B →AB (fast) reaction is : (1) 2 (2) 2.5 (3) 3 (4) 1.5 Q65.1.24 g of AX2 (molar mass 124 g mol−1 ) is dissolved in 1 kg of water to form a solution with boiling point of 100.0156∘C, while 25.4 g∘ of AY2 (molar mass 250 g mol−1 ) in 2 kg of water constitutes a solution with a boiling point of 100.0260∘C. Kb (H2O) = 0.52 K kg mol−1 Which of the following is correct ? (1) AX2 is fully ionised while AY2 is completely (2) AX2 is completely unionised while AY2 is fully unionised. ionised. (3) AX2 and AY2 (both) are completely unionised. (4) AX2 and AY2 (both) are fully ionised.

Q64.Which of the following statement is true with respect to H2O, NH3 and CH4 ? A. The central atoms of all the molecules are sp3 hybridized. B. The H −O −H, H −N −H and H −C −H angles in the above molecules are 104.5∘, 107.5∘ and 109.5∘ , respectively. C. The increasing order of dipole moment is CH4 < NH3 < H2O. D. Both H2O and NH3 are Lewis acids and CH4 is a Lewis base. E. A solution of NH3 in H2O is basic. In this solution NH3 and H2O act as Lowry-Bronsted acid and base respectively. Choose the correct answer from the options given below: (1) A, B and C Only (2) A, D and E Only (3) C, D and E Only (4) A, B, C and E Only

Q64.First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family : (1) 1402 kJ mol−1 (2) 834 kJ mol−1 (3) 1012 kJ mol−1 (4) 947 kJ mol−1

Q64.How many different stereoisomers are possible for the given molecule? (1) 2 (2) 1 (3) 4 (4) 3

Q64. Residue (A) + HCl (dil) → Compound (B) Structure of residue (A) and compound (B) formed respectively is : (1) (2) (3) (4)

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)

Q64.Assume a living cell with 0.9%(ω/ω) of glucose solution (aqueous). This cell is immersed in another solution having equal mole fraction of glucose and water. (Consider the data upto first decimal place only) The cell will : (1) show no change in volume since solution is (2) shrink since solution is 0.5%(ω/ω) 0.9%(ω/ω) (3) swell up since solution is 1%(ω/ω) (4) None of these

Q64.Consider a binary solution of two volatile liquid components 1 and 2. x1 and y1 are the mole fractions of component 1 in liquid and vapour phase, respectively. The slope and intercept of the linear plot of 1 vs 1 x1 y1 are given respectively as: P02−P01 (1) P0 P02−P01 (2) P0 2 , 1 , P01 P02 P02 P02 P01−P02 (3) P0 P01−P02 (4) P0 1 , 2 , P02 P02 P01 P02

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.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

Q65.Given below are two statements : Statement (I): According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number. Statement (II): Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers. In the light of the above statements, choose the correct answer from the options given below : (1) Both Statement (I) and Statement (II) are false. (2) Both Statement (I) and Statement (II) are true. (3) Statement (I) is false but Statement (II) is true. (4) Statement (I) is true but Statement (II) is false. 2025 (28 Jan Shift 2) JEE Main Previous Year Paper

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. 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 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