Practice Questions

Q17.A proton moving with one tenth of velocity of light has a certain de Broglie wavelength of 𝜆. An alpha particle having certain kinetic energy has the same de-Brogle wavelength 𝜆. The ratio of kinetic energy of proton and that of alpha particle is : (1) 2 : 1 (2) 4 : 1 (3) 1 : 2 (4) 1 : 4 JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper

Q18.Equivalent resistance between the adjacent corners of a regular n -sided polygon of uniform wire of resistance R would be : (1) (n−1)R (2) (n−1)R n2 (2n−1) (3) n2R (4) (n−1)R n−1 n

Q20.Find the mutual inductance in the arrangement, when a small circular loop of wire of radius R is placed inside a large square loop of wire of side L(L ≫R) . The loops are coplanar and their centres coincide : JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper (1) M = √2μ0R2L (2) M = 2√2μ0RL2 (3) M = 2√2μ0R2L (4) M = √2μ0RL2

Q27.For a nucleus AZX having mass number A and atomic number Z = –a1A 3 . A. The surface energy per nucleon (bs) 2 B. The Coulomb contribution to the binding energy bc = −a2 Z(Z−1)4 . A 3 JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper C. The volume energy bv = a3A D. Decrease in the binding energy is proportional to surface area. E. While estimating the surface energy, it is assumed that each nucleon interacts with 12 nucleons. ( a1, a2 and a3 are constants) Choose the most appropriate answer from the options given below: (1) B, C, E only (2) C, D only (3) A, B, C, D only (4) B, C only

Q35.But-2-yne is reacted separately with one mole of Hydrogen as shown below: Na Pd / C ← B CH3 - C ≡ C - CH3 →∆ A¯ ¯ liq NH3 +H2 Identify the incorrect statements from the options given below: A. A is more soluble than B. B. The boiling point & melting point of A are higher and lower than B respectively. C. A is more polar than B because dipole moment of A is zero. D. Br2 adds easily to B than A. (1) B and C only (2) B, C and D only (3) A, C and D only (4) A and B only

Q35.Gibbs energy vs T plot for the formation of oxides is given below. For the given diagram, the correct statement is- (1) At 600°C, CO cannot reduce FeO (2) At 600°C, CO can reduce ZnO (3) At 600°C, C can reduce ZnO (4) At 600°C, C can reduce FeO

Q36.Choose the correct set of reagents for the following conversion transPh - CH = CH - CH3 → cis Ph - CH = CH - CH3 (1) Br2, alc KOH, NaNH2, NaLiqNH3 (2) Br2, alc KOH, NaNH2, H2 Lindlar Catalyst (3) Br2, aqKOH, NaNH2, H2 Lindlar Catalyst (4) Br2, aq KOH, NaNH2, NaLiqNH3

Q39.The correct order for acidity of the following hydroxyl compound is (A) CH3OH (B) CH33COH (C) (D) (E) Choose the correct answer from the options given below: (1) C > E > D > B > A (2) E > D > C > B > A (3) D > E > C > A > B (4) E > C > D > A > B

Q39.The product formed in the following multistep reaction is: (1) (2) (3) (4)

Q44.A hydrocarbon 'X' with formula C6H8 uses two moles of H2 on catalystic hydrogenation of its one mole. On ozonolysis, 'X' yields two moles of methane dicarbaldehyde. The hydrocarbon 'X' is : (1) hexa- 1, 3, 5 -triene (2) 1-methylcyclopenta- 1, 4−diene (3) cyclohexa −1, 3−diene (4) cyclohexa −1, 4−diene

Q45.The correct order of the number of unpaired electrons in the given complexes is (A) [Fe ( CN ) 3 - 6] (B) FeF6 3 - (C) CoF6 3 - (D) Cr ( oxalate 3 - ) 3 (E) Ni ( CO ) 4 Choose the correct answer from the options given below: (1) E < A < D < C < B (2) E < A < B < D < C (3) A < E, C < B < D (4) A < E < D < C < B

Q47.Consider the following reaction ( i ) dil . NaOH Propanal + Methanal = → Product B (ii) Δ(iii) NaCN(iv) H3O+ ( C5H8O3 ) The correct statement for product 𝐵 is. It is JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper (1) optically active and adds one mole of bromine (2) racemic mixture and is neutral (3) racemic mixture and gives a gas with saturated (4) optically active alcohol and is neutrall NaHCO3 solution

Q47.Evaluate the following statements for their correctness. A. The elevation in boiling point temperature of water will be same for 0. 1 M NaCl and 0. 1 M urea. B. Azeotropic mixture boil without change in their composition. C. Osmosis always takes place from hypertonic to hypotonic solution. D. The density of 32% H2 SO4 solution having molarity 4. 09 M is approximately 1. 26 g mL–1 . E. A negatively charged sol is obtained when KI solution is added to silver nitrate solution. Choose the correct answer from the options given below: (1) B and D only (2) B, D and E only (3) A and C only (4) A, B and C only

Q49.Match List I with List II: List I (Monomer) List II (Polymer) (A) Tetrafluoroethene (I) Orlon (B) Acrylonitrile (II) Natural rubber (C) Caprolactam (III) Teflon (D) Isoprene (IV) Nylon- 6 Choose the correct answer from the options given below: (1) (A) −(III), (B) −(I), (C) −(IV), (D) −(II) (2) (A) −(IV), (B) −(I), (C) −(II), (D) −(III) (3) (A) −(III), (B) −(IV), (C) −(II), (D) −(I) (4) (A) −(II), (B) −(III), (C) −(IV), (D) −(I)

Q49.Consider the following reaction that goes from A to B in three steps as shown below: Choose the correct option Number of Rate Number of Activated determining Intermediates Complexes step (1) 2 3 I (2) 2 3 III (3) 2 3 II (4) 3 2 II (1) (1) (2) (2) (3) (3) (4) (4)

Q50.Given below are two statements : Statement I : Noradrenaline is a neurotransmitter. Statement II : Low level of noradrenaline is not the cause of depression in human. In the light of the above statements, choose the correct answer from the options given below (1) Both statement 1 and 2 are correct.. (2) Statement 1 is correct but statement 2 is incorrect (3) Statement 1 is incorrect but statement 2 is correct (4) Both statement 1 and 2 are correct

Q52.Match List I with List II JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper List I List II Coordination entity Wavelength of light absorbed in nm A [CoCl (NH3)5]2+ I. 310 B [Co (NH3)6]3+ II. 475 C [Co(CN)6]3− III. 535 D [Cu (H2O)4]2+ IV. 600 Choose the 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 −III, B −I, C −II, D −IV (4) A − II, B −III, C −IV, D −I

Q53.Which of the following complex is octahedral, diamagnetic and the most stable? (1) Na3[CoCl6] (2) [Ni (NH3)6] Cl2 (3) K3[Co(CN)6] (4) [Co (H2O)6] Cl2

Q54.The correct order of spin only magnetic moments for the following complex ions is (1) [Fe(CN)6]3−< [CoF6]3−< [MnBr4]2−< [Mn(CN)6]3−(2) [CoF6]3−< [MnBr4]2−< [Fe(CN)6]3−< [Mn(CN)6]3− (3) [Fe(CN)6]3−< [Mn(CN)6]3−< [CoF6]3−< [MnBr4]2−(4) [MnBr4]2−< [CoF6]3−< [Fe(CN)6]3−< [Mn(CN)6]3−

Q55.Identify the correct order for the given property for following compounds Choose the correct answer from the option given below :- (1) (B), (C) and (D) only (2) (A), (C) and (E) only (3) (A), (C) and (D) only (4) (A), (B) and (E) only

Q55.Cyclohexylamine when treated with nitrous acid yields (P). On treating (P) with PCC results in (Q). When (Q) is heated with dil. NaOH we get (R) The final product (R) is: (1) (2) (3) (4)

Q56.Find out the major products from the following reaction sequence. JEE Main 2023 (29 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q56. In the above reaction, left hand side and right hand side rings are named as ‵A′ and ‵B′ respectively. They undergo ring expansion. The correct statement for this process is: (1) Ring expansion can go upto seven membered (2) Finally both rings will become six membered rings each. (3) Finally both rings will become five membered (4) Only A will become 6 membered. each.

Q57.An organic compound [A](C4H11 N), shows optical activity and gives N2 gas on treatment with HNO2 . The compound [A] reacts with PhSO2 Cl producing a compound which is soluble in KOH. The structure of A is : JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q58.Number of compounds from the following which will not dissolve in cold NaHCO3 and NaOH solutions but will dissolve in hot NaOH solution is _____ . JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper