Practice Questions

Q42.In the given reactions identify A and B . (1) 𝐴 : 2–Pentyne B : trans – 2 – butene (2) A : n – Pentane B : trans – 2 – butene (3) A : 2 – Pentyne B : Cis – 2 – butene (4) A : n – Pentane B : Cis – 2 – butene

Q42.Which of the following compound will most easily be attacked by an electrophile? (1) (2) (3) (4) JEE Main 2024 (01 Feb Shift 1) JEE Main Previous Year Paper

Q42.What will be the decreasing order of basic strength of the following conjugate bases? –– −OH, RO, CH3COO, C–I –––– (1) RO > −OH > CH3COO > C–I (2) C–l > RO > −OH > CH3COO –––– (3) −OH > RO > CH3COO > C–1 (4) C–I > −OH > RO > CH3COO

Q42.On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed? JEE Main 2024 (09 Apr Shift 1) JEE Main Previous Year Paper (1) Nitric oxide (2) Nitrous oxide (3) Lead nitrate (4) Sulphur Q43. 0.05MCuSO4 when treated with 0.01MK2Cr2O7 gives green colour solution of Cu2Cr2O7 . The two solutions are separated as shown below : [SPM : Semi Permeable Membrane] Due to osmosis : (1) Molarity of CuSO4 solution is lowered. (2) Molarity of K2Cr2O7 solution is lowered. (3) Green colour formation observed on side Y. (4) Green colour formation observed on side X.

Q43.The final product A formed in the following multistep reaction sequence is (1) (2) (3) (4)

Q43.Integrated rate law equation for a first order gas phase reaction is given by (where 𝑃𝑖 is initial pressure and 𝑃𝑡 is total pressure at time 𝑡) 2 . 303 𝑃𝑖 2 . 303 2𝑃𝑖 (1) 𝑘= × log (2) 𝑘= × log 𝑡 2𝑃𝑖- 𝑃𝑡 𝑡 2𝑃𝑖- 𝑃𝑡 2 . 303 2𝑃𝑖- 𝑃𝑡 2 . 303 𝑃𝑖 (3) 𝑘= × log (4) 𝑘= × 𝑡 𝑃𝑖 𝑡 2𝑃𝑖- 𝑃𝑡

Q43.Identify the incorrect statements about group 15 elements : (A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature. (B) The common oxidation states of these elements are −3, +3 and +5 . (C) Nitrogen has unique ability to form pπ −pπ multiple bonds. (D) The stability of +5 oxidation states increases down the group. (E) Nitrogen shows a maximum covalency of 6. Choose the correct answer from the options given below : JEE Main 2024 (08 Apr Shift 2) JEE Main Previous Year Paper (1) (A), (C), (E) only (2) (B), (D), (E) only (3) (D) and (E) only (4) (A), (B), (D) only

Q43.The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is _____. Ti2+, Cr2+ and V2+ (1) 2 (2) 3 (3) 1 (4) 0

Q43.Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. Fe3+ oxidises the iodide ion B. Fe3+ oxidises the persulphate ion C. Fe2+ reduces the iodide ion D. Fe2+ reduces the persulphate ion Choose the most appropriate answer from the options given below: (1) B only (2) A only (3) B and C only (4) A and D only

Q43.Choose the correct statements from the following A. Mn2O7 is an oil at room temperature B. V2O4 reacts with acid to give VO22 + C. CrO is a basic oxide D. V2O5 does not react with acid Choose the correct answer from the options given below: (1) A, B and D only (2) A and C only (3) A, B and C only (4) B and C only

Q43.We have three aqueous solutions of NaCl labelled as ‘A’, ‘B’ and ‘C’ with concentration 0 . 1 M, 0 . 01M and 0 . 001 M, respectively. The value of van t’ Haft factor i for these solutions will be in the order. (1) iA < iB < iC (2) iA < iC < iB (3) iA = iB = iC (4) iA > iB > iC

Q43.Choose the correct Statements from the following: (A) Ethane −1 , 2 −diamine is a chelating ligand. (B) Metallic aluminium is produced by electrolysis of aluminium oxide in presence of cryolite. (C) Cyanide ion is used as ligand for leaching of silver. (D) Phosphine act as a ligand in Wilkinson catalyst. (E) The stability constants of Ca2+ and Mg2+ are similar with EDTA complexes. Choose the correct answer from the options given below: (1) (B), (C), (E) only (2) (C), (D), (E) only (3) (A), (B), (C) only (4) (A), (D), (E) only

Q43. List - I List - II A. K2 [Ni(CN)4] I. sp3 Match List I with List II B. [Ni(CO)4] II. sp3 d2 Choose the correct answer from the C. [Co(NH3)6]Cl3 III. dsp2 D. Na3 [CoF6] IV. d2sp3 options given below: (1) A-III, B-I, C-IV, D-II (2) A-III, B-I, C-II, D-IV (3) A-I, B-III, C-II, D-IV (4) A-III, B-II, C-IV, D-I

Q43. The correct arrangement for decreasing order of electrophilic substitution for above compounds is : (1) (III) > (I) > (II) > (IV) (2) (IV) > (I) > (II) > (III) (3) (III) > (IV) > (II) > (I) (4) (II) > (IV) > (III) > (I) – −

Q44.Alkaline oxidative fusion of MnO2 gives "A " which on electrolytic oxidation in alkaline solution produces 𝐵. 𝐴 and 𝐵 respectively are: (1) Mn2O7 and MnO4- (2) MnO42 - and MnO4- (3) Mn2O3 and MnO42 - (4) MnO42 - and Mn2O7

Q44.While preparing crystals of Mohr's salt, dil H2SO4 is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil H2SO4 is added here to : (1) prevent the hydrolysis of ferrous sulphate (2) prevent the hydrolysis of ammonium sulphate (3) make the medium strongly acidic (4) increase the rate of formation of crystals

Q44.Identify from the following species in which d2sp3 hybridization is shown by central atom: (1) CoNH36 3 + (2) BrF5 (3) Pt ( Cl ) 2 - (4) SF6 4

Q44.The transition metal having highest 3rd ionisation enthalpy is: (1) Cr (2) Mn (3) V (4) Fe

Q44.Number of Complexes with even number of electrons in t2g orbitals is - [Fe(H2O)6]2+, [Co(H2O)6]2+, [Co(H2O)6]3+, [Cu(H2O)6]2+, [Cr(H2O)6]2+ (1) 2 (2) 3 (3) 1 (4) 5

Q44.Select the option with correct property: (1) 𝑁𝑖𝐶𝑂4 and 𝑁𝑖𝐶𝑙4 2 − both diamagnetic (2) 𝑁𝑖𝐶𝑂4 and 𝑁𝑖𝐶𝑙4 2 − both paramagnetic (3) 𝑁𝑖𝐶𝑙4 2 − diamagnetic, 𝑁𝑖𝐶𝑂4 paramagnetic (4) 𝑁𝑖𝐶𝑂4 diamagnetic, 𝑁𝑖𝐶𝑙4 2 − paramagnetic

Q44.Consider the given reaction, identify the major product P . CH3 −COOH (i) LiAlH4 (ii) PCC (iii) HCN/OH→ "P" – (iv) H2O/OH,Δ JEE Main 2024 (06 Apr Shift 2) JEE Main Previous Year Paper (1) (2) CH3 −CH2 −CH2 −OH (3) (4)

Q44. NaCl reacts with conc. H2 SO4 and K2 Cr2 O7 to give reddish fumes (B), which react with NaOH to give yellow solution (C). (B) and (C) respectively are ; (1) CrO2 Cl2, Na2 CrO4 (2) Na2 CrO4, CrO2 Cl2 (3) CrO2 Cl2, KHSO4 (4) CrO2 Cl2, Na2 Cr2 O7

Q44.When MnO2 and H2SO4 is added to a salt (A), the greenish yellow gas liberated as salt (A) is : (1) CaI2 (2) NaBr (3) KNO3 (4) NH4Cl

Q44.lectronic configuration of Cu(II) is 3 d9 whereas that of Cu(I) is 3 d10 . Which of the following is correct? (1) Stability of Cu(I) and Cu(II) depends on nature (2) Cu(II) is more stable of copper salts (3) Cu(I) and Cu(II) are equally stable (4) Cu (II) is less stable

Q44.Phenol treated with chloroform in presence of sodium hydroxide, which further hydrolysed in presence of an acid results (1) Salicyclic acid (2) Benzene-1,2-diol (3) Benzene-1, 3-diol (4) 2-Hydroxybenzaldehyde