Practice Questions

Q42.The reaction at cathode in the cells commonly used in clocks involves. (1) reduction of Mn from +7 to +2 (2) reduction of Mn from +4 to +3 (3) oxidation of Mn from +3 to +4 (4) oxidation of Mn from +2 to +7

Q42. List - I List - II Reaction Type of redox reaction (A) TiCl4 (I) e2, t02 Match List - I with List - II. Choose the correct answer from the (B) [FeO4]2− (II) e4, t32 (C) [FeCl4]− (III) e0, t02 (D) [CoCl4]2− (IV) e2, t32 options given below : (1) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) (2) (A)-(IV), (B)-(III), (C)-(I), (D)-(II) (3) (A)-(III), (B)-(I), (C)-(IV), (D)-(II) (4) (A)-(I), (B)-(III), (C)-(IV), (D)-(II)

Q42.The orange colour of K2Cr2O7 and purple colour of KMnO4 is due to (1) Charge transfer transition in both. (2) d →d transition in KMnO4 and charge transfer transitions in K2Cr2O7. (3) d →d transition in K2Cr2O7 and charge transfer (4) d →d transition in both. transitions in KMnO4. Q43.𝐴 and 𝐵 formed in the following reactions are: CrO2Cl2 + 4NaOH →A + 2NaCl + 2H2O A + 2HCl + 2H2O2 →B + 3H2O (1) A = Na2CrO4, B = CrO5 (2) A = Na2Cr2O4, B = CrO4 (3) A = Na2Cr2O7, B = CrO3 (4) A = Na2Cr2O7, B = CrO5

Q42.Choose the correct statements from the following A. All group 16 elements form oxides of general formula 𝐸𝑂2 and 𝐸𝑂3 where 𝐸= 𝑆, 𝑆𝑒, 𝑇𝑒 and 𝑃𝑜. Both the types of oxides are acidic in nature. B. 𝑇𝑒𝑂2 is an oxidising agent while 𝑆𝑂2 is reducing in nature. C. The reducing property decreases from 𝐻2𝑆 to 𝐻2𝑇𝑒 down the group. D. The ozone molecule contains five lone pairs of electrons. Choose the correct answer from the options given below: (1) A and D only (2) B and C only (3) C and D only (4) A and B only JEE Main 2024 (31 Jan Shift 2) JEE Main Previous Year Paper

Q43.Alkyl halide is converted into alkyl isocyanide by reaction with (1) NaCN (2) NH4 CN (3) KCN (4) AgCN JEE Main 2024 (29 Jan Shift 2) JEE Main Previous Year Paper

Q43.Identity the incorrect pair from the following: (1) Photography - AgBr (2) Polythene preparation - TiCl4, AlCH33 (3) Haber process - Iron (4) Wacker process - PtCl2

Q43.Element not showing variable oxidation state is : (1) Bromine (2) Iodine (3) Chlorine (4) Fluorine

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

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.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.The strongest reducing agent amont the following is: JEE Main 2024 (01 Feb Shift 2) JEE Main Previous Year Paper (1) NH3 (2) SbH3 (3) BiH3 (4) PH3

Q43.Molar ionic conductivities of divalent cation and anion are 57 S cm2 mol−1 and 73 S cm2 mol−1 respectively. The molar conductivity of solution of an electrolyte with the above cation and anion will be : (1) 187 S cm2 mol−1 (2) 260 S cm2 mol−1 (3) 130 S cm2 mol−1 (4) 65 S cm2 mol−1

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.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.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.The element which shows only one oxidation state other than its elemental form is : (1) Cobalt (2) Titanium (3) Nickel (4) Scandium

Q43.The number of element from the following that do not belong to lanthanoids is Eu, Cm, Er, Tb, Yb and Lu (1) 3 (2) 4 (3) 1 (4) 5

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. 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) – −

Q43.Fuel cell, using hydrogen and oxygen as fuels, A. has been used in spaceship B. has as efficiency of 40% to produce electricity C. uses aluminum as catalysts D. is eco-friendry E. is actually a type of Galvanic cell only Choose the correct answer from the options given below: (1) A, B, D, E only (2) A, D, E only (3) A, B, D only (4) A, B, C 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

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.The coordination environment of Ca2+ ion in its complex with EDTA4− is : (1) tetrahedral (2) trigonal prismatic (3) octahedral (4) square planar

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