Practice Questions

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

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.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.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

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

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.A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86BM. The atomic number of the metal is (1) 26 (2) 25 (3) 23 (4) 22

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.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

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.he following complexes [CoCl(NH3)5]2+ , [Co(CN)6]3− , [Co(NH3)5 (H2O)]3+ , [Cu(H2O)4]2+ The correct (A) (B) (C) (D) order of A, B, C and D in terms of wavenumber of light absorbed is : (1) C < D < A < B (2) B < C < A < D (3) A < C < B < D (4) D < A < C < B

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.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 among the following halide/s will not show SN1 reaction: (1) H2C = CH - CH2Cl (2) CH3 - CH = CH - Cl (3) (4)

Q45. Consider the above chemical reaction. Product " A " is : (1) (2) (3) (4)

Q45. This reduction reaction is known as: (1) Rosenmund reduction (2) Wolff-Kishner reduction (3) Stephen reduction (4) Etard reduction

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.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.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.The molecule/ion with square pyramidal shape is: (1) Ni ( CN ) 2 - (2) PCl5 4 (3) BrF5 (4) PF5 JEE Main 2024 (30 Jan Shift 2) JEE Main Previous Year Paper

Q45.Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, Cr = 24, Mn = 25, Fe = 26, Co = 27 ] (1) [Cr(H2O)6]2+ (2) [Fe(H2O)6]2+ (3) [Co(H2O)6]2+ (4) [Mn(H2O)6]2+

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

Q46.Which among the following compounds will undergo fastest SN2 reaction. (1) (2) (3) (4)