Practice Questions

Q39.Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is (1) NO (2) N2O5 (3) N2 (4) N2O3 JEE Main 2020 (03 Sep Shift 1) JEE Main Previous Year Paper

Q39.The major product in the following reaction is: JEE Main 2020 (03 Sep Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q39.The number of isomers possible for [Pt(en)(NO2)2] is: (1) 2 (2) 4 (3) 1 (4) 3

Q40.For a d4 metal ion in an octahedral field, the correct electronic configuration is : (1) t3 2g e1g when ΔO < P (2) t32g e1g when ΔO > P (3) t42g e0g when ΔO < P (4) e2g t22g when ΔO < P

Q40.The pair in which both the species have the same magnetic moment (spin only) is: (1) [Cr (H2O)6]2+ and [Fe (H2O)6]2+ (2) [Co (OH)4]2– and [Fe (NH3)6]2+ (3) [Mn (H2O)6]2+ and [Cr (H2O)6]2+ (4) [Cr (H2O)6]2+ and [CoCl4]2–

Q40.The IUPAC name of the complex [Pt(NH3)2Cl(NH2CH3)]Cl is (1) Diamminechlorido (methanamine) platinum (II) (2) Diammine(methanamine)chlorido platinum (II) chloride chloride (3) Diamminechlorido (aminomethane) platinum (II) (4) Bisammine (methanamine) chlorido platinum chloride (II) chloride

Q40.In a molecule of pyrophosphoric acid, the number of P −O H, P = 0 and P −O −P bonds/moiety(ies) respectively are : (1) 2, 4 and 1 (2) 3, 3 and 3 (3) 4, 2 and 0 (4) 4, 2 and 1

Q40.The one that can exhibit highest paramagnetic behaviour among the following is : gly = glycinato; bpy = 2, 2' −bipyridine (1) [Pd(gly)2] (2) [Fe(en)(bpy)(NH3)2]2* (3) [Co(OX)2(OH)2]−(Δ0 > P) (4) [Ti (NH3)6]3*

Q40.Among the statements (a) −(d) , the incorrect ones are: (a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments (b) When Δ0 < P , the d-electron configuration of Co(III) in an octahedral complex is t4ege2g (c) Wavelength of light absorbed by [Co(en)3]3+ is lower than that of [CoF6]3− (d) If the Δ0 for an octahedral complex of Co(III) is 18,000cm−1 , the Δt for its tetrahedral complex with the same ligand will be 16,000cm−1 . (1) (a) and (d) only (2) (c) and (d) only (3) (a) and (b) only (4) (b) and (c) only JEE Main 2020 (07 Jan Shift 2) JEE Main Previous Year Paper

Q40.The values of the crystal field stabilization energies for a high spin d6 metal ion in octahedral and tetrahedral fields, respectively, are: (1) −0 .4 Δo and −0. 6Δt (2) −2 .4 Δo and −0. 6 Δt (3) −1 .6 Δo and −0. 4Δt (4) −0 .4 Δo and −0 .27 Δt

Q40.The one that is not expected to show isomerism is: (1) [Ni (NH3)4(H2O)2]2+ (2) [Ni(en)3]2+ (3) [Ni (NH3)2 Cl2] (4) [Pt (NH3)2 Cl2]

Q40.The complex that can show fac - and mer -isomers is: (1) [Co(NH3)4Cl2]+ (2) [Pt(NH3)2Cl2] (3) [CoCl2(en)2] (4) [Co(NH3)3(NO2)3]

Q40.Consider the following reaction: The product ′P′gives positive ceric ammonium nitrate test. This is because of the presence of which of these – OH group(s)? (1) (b) only (2) (c) and (d) (3) (d) only (4) (b) and (d)

Q41.The theory that can completely/properly explain the nature of bonding in [Ni (CO)4] is: (1) Werner's theory (2) Molecular orbital theory (3) Crystal field theory (4) Valence bond theory Q42. 1-methyl ethylene oxide when treated with an excess of HBr produces (1) (2) (3) (4) JEE Main 2020 (07 Jan Shift 1) JEE Main Previous Year Paper

Q41.An organic compound (A) (molecular formula C6H12O2 ) was hydrolysed with dil. H2 SO4 to give a carboxylic acid (B) and an alcohol (C). ‘ C ’ gives white turbidity immediately when treated with anhydrous ZnCl2 and conc. HCl. The organic compound (A) is: JEE Main 2020 (04 Sep Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q41.A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively, are: (1) Na and NaNO3 (2) Na and Mg3N2 (3) Mg and Mg3N2 (4) Mg and Mg(NO3)2 JEE Main 2020 (08 Jan Shift 2) JEE Main Previous Year Paper

Q41.The major product obtained from E2 -elimination of 3 −bromo −2 −fluoropentane is (1) (2) (3) (4)

Q41.The major product [B] in the following reaction is : (1) CH2 = CH2 (2) (3) (4) CH3 −CH2 CH = CH −CH3

Q41.The decreasing order of reactivity towards dehydrohalogenation (E1) reaction of the following compounds is: (1) D > B > C > A (2) B > D > A > C (3) B > D > C > A (4) B > A > D > C JEE Main 2020 (08 Jan Shift 1) JEE Main Previous Year Paper

Q41.The increasing order of the reactivity of the following compounds in nucleophile addition reaction is: Propanal, Benzaldehyde, Propanone, Butanone (1) Benzaldehyde > Butanone < Propanone < Propanal (2) Butanone < Propanone < Benzaldehyde < Propanal (3) Propanal < Propanone < Butanone < Benzaldehyde (4) Benzaldehyde < Propanal < Propanone < Butanone

Q41.The electronic spectrum of [Ti (H2O)6]3+ shows a single broad peak with a maximum at 20, 300 cm−1. The crystal field stabilization energy (CFSE) of the complex ion, in kJmol−1, is : (1 kJmol−1 = 83. 7 cm−1) (1) 145.5 (2) 242.5 (3) 83.7 (4) 97

Q41.Consider that d6 metal ion (M2+) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4 .90 BM. The geometry and the crystal field stabilization energy of the complex is : (1) octahedral and −2. 4Δ0 + 2P (2) tetrahedral and −0 .6 Δt (3) octahedral and −1. 6Δ0 (4) tetrahedral and −1. 6Δt + 1P

Q41.Which of the following derivatives of alcohols is unstable in an aqueous base? (1) (2) (3) (4) RO −CMe3

Q41.Reaction of ammonia with excess Cl2 gives : (1) NH4 Cl and N2 (2) NH4 Cl and HCl (3) NCl3 and NH4 Cl (4) NCl3 and HCl cis −[Co(en)2 Cl2]+(B). The correct

Q41.The set that contains atomic numbers of only transition elements, is : (1) 37,42,50,64 (2) 21,25,42,72 (3) 9,17,34,38 (4) 21,32,53,64