Practice Questions

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

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.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.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

Q44.The coordination environment of Ca2+ ion in its complex with EDTA4− is : (1) tetrahedral (2) trigonal prismatic (3) octahedral (4) square planar

Q44.Aluminium chloride in acidified aqueous solution forms an ion having geometry (1) Octahedral (2) Square Planar (3) Tetrahedral (4) Trigonal bipyramidal

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.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.Number of complexes from the following with even number of unpaired " d " electrons is [V(H2O)6]3+, [Cr(H2O)6]2+, [Fe(H2O)6]3+, [Ni(H2O)6]3+, [Cu(H2O)6]2+ [Given atomic numbers : V = 23, Cr = 24, Fe = 26, Ni = 28Cu = 29] (1) 2 (2) 1 (3) 4 (4) 5

Q44.The metal that shows highest and maximum number of oxidation state is : (1) Fe (2) Mn (3) Co (4) Ti

Q45.Identify the reagents used for the following conversion (1) A = LiAlH4, B = NaOH(aq), C = NH2 −NH2 / KOH ethylene glycol (2) A = LiAlH4, B = NaOH(alc) , C = Zn / HCl (3) A = DIBAL −H, B = NaOH(aq) C = NH2 −NH2 / KOH ethylene glycol (4) A = DIBAL −H, B = NaOH(alc), C = Zn / HCl

Q45.An octahedral complex with the formula CoCl3 ⋅nNH3 upon reaction with excess of AgNO3 solution gives 2 moles of AgCl. Consider the oxidation state of Co in the complex is ' x '. The value of " x + n " is ______ (1) 6 (2) 8 (3) 3 (4) 5

Q45.Which of the following compounds show colour due to d - d transition? (1) CuSO4 · 5H2O (2) K2Cr2O7 (3) K2CrO4 (4) KMnO4

Q45.Identify correct statements from below: A. The chromate ion is square planar. JEE Main 2024 (31 Jan Shift 1) JEE Main Previous Year Paper B. Dichromates are generally prepared from chromates. C. The green manganate ion is diamagnetic. D. Dark green coloured K2MnO4 disproportionates in a neutral or acidic medium to give permanganate. E. With increasing oxidation number of transition metal, ionic character of the oxides decreases. Choose the correct answer from the options given below: (1) B, C, D only (2) A, D, E only (3) A, B, C only (4) B, D, E only

Q45. List - I List - II (Complex ion) (Spin only magnetic moment in B.M.) (A) [Cr(NH3)6]3+ (I) 4.90 Match List - I with List - II. Choose the (B) [NiCl4]2− (II) 3.87 (C) [CoF6]3− (III) 0.0 (D) [Ni(CN)4]2− (IV) 2.83 correct answer from the options given below : (1) (A)-(II), (B)-(III), (C)-(I), (D)-(IV) (2) (A)-(II), (B)-(IV), (C)-(I), (D)-(III) (3) (A)-(I), (B)-(IV), (C)-(II), (D)-(III) (4) (A)-(IV), (B)-(III), (C)-(I), (D)-(II)

Q45. In the above reaction product ' P ' is JEE Main 2024 (09 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q45.Match List I with List II LIST – II LIST – I (Electronic (Complex ion) Configuration A. 𝐶𝑟𝐻2𝑂6 3 + I. 𝑡2𝑔2 𝑒𝑔0 B. 𝐹𝑒𝐻2𝑂6 3 + II. 𝑡2𝑔3 𝑒𝑔0 C. 𝑁𝑖𝐻2𝑂6 2 + III. 𝑡2𝑔3 𝑒𝑔2 D. 𝑉𝐻2𝑂6 3 + IV. 𝑡2𝑔6 𝑒𝑔2 Choose the correct answer from the options given below : (1) A-III, B-II, C-IV, D-I (2) A-IV, B-I, C-II, D-III (3) A-IV, B-III, C-I, D-II (4) A-II, B-III, C-IV, D-I

Q45.The number of complexes from the following with no electrons in the t2 orbital is TiCl4, [MnO4]−, [FeO4]2−, [FeCl4]−, [CoCl4]2− JEE Main 2024 (05 Apr Shift 2) JEE Main Previous Year Paper (1) 1 (2) 4 (3) 3 (4) 2

Q45.The correct sequence of ligands in the order of decreasing field strength is : (1) NCS−> EDTA4−> CN−> CO (2) CO > H2O > F−> S2− (3) S2−> −OH > EDTA4−> CO (4) −OH > F−> NH3 > CN−

Q45.The F− ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula. (1) [3 (Ca3(PO4)2) ⋅Ca(OH)2] (2) [3 (Ca3(PO4)3) ⋅CaF2] (3) [3 (Ca2(PO4)2) ⋅Ca(OH)2] (4) [3 (Ca3(PO4)2) ⋅CaF2]

Q45.In chromyl chloride test for confirmation of Cl– ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10% H2O2 turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is (1) +6 (2) +5 (3) +10 (4) +3