Practice Questions

Q39.The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+(Z = 64), respectively, are : (1) [Xe]4f 7 and 8. 9 (2) [Xe]4f 7 and 7. 9 (3) [Xe]5f 7 and 8. 9 (4) [Xe]5f 7 and 7. 9

Q39.Adsorption of a gas follows Freudlich adsorption isotherm. If x is the mass of the gas adsorbed on mass m of the adsorbent, the correct plot of x versus p is: m (1) (2) (3) (4)

Q39.White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2 gives phosphine and compound (X). (X) on acidification with HCl gives compound (Y ). The basicity of compound (Y ) is: (1) 2 (2) 1 (3) 4 (4) 3

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.Mischmetal is an alloy consisting mainly of : (1) Lanthanoid metals (2) actinoid and transition metals (3) lanthanoid and actinoid metals (4) actinoid metals

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 Crystal Field Stabilization Energy (CFSE) of [CoF 3(H2O)3](Δ0 < P) is : (1) −0. 8 Δ0 + 2P (2) −0. 4 Δ0 (3) −0. 8 Δ0 (4) −0. 4 Δ0 + P

Q39.The electronic configurations of bivalent europium and trivalent cerium are: (atomic number: Xe = 54 , Ce = 58 , Eu = 63) (1) [Xe]4f 2 and [Xe]4f 7 (2) [Xe]4f 7 and [Xe]4f 1 (3) [Xe]4f 76s2 and [Xe]4f 26s2 (4) [Xe]4f 4 and [Xe]4f 9

Q39.The atomic radius of Ag is closest to (1) Au (2) Ni (3) Cu (4) Hg

Q39.The statement that is not true about ozone is : (1) in the stratosphere, CFCs release chlorine free (2) in the atmosphere, it is depleted by CFCs. radicals (CI) which reacts with O3 to give chlorine (3) in the stratosphere, it forms a protective shield (4) It is a toxic gas and its reaction with NO gives against UV radiation. NO2

Q39.Simplified absorption spectra of three complexes ((i) and (ii) and (iii)) of M+n ion are provided below; their λmax values are marked as A, B and C respectively. The correct match between the complexes and their λmax JEE Main 2020 (02 Sep Shift 2) JEE Main Previous Year Paper values is: (i) [M(NCS)6](−6+n) (ii) [MF6](−6+n) (iii) [M(NH3)6]n+ (1) A −(iii), (B) −(i), C −(ii) (2) A −(ii), (B) −(i), C −(iii) (3) A −(ii), (B) −(iii), C −(i) (4) A −(i), (B) −(ii), C −(iii)

Q39.The number of bonds between sulphur and oxygen atoms in S2O2−8 and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively are: (1) 4 and 6 (2) 8 and 8 (3) 8 and 6 (4) 4 and 8

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

Q40.The INCORRECT statement is : (1) bronze is an alloy of copper and tin. (2) cast iron is used to manufacture wrought iron. (3) german silver is an alloy of zinc, copper and (4) brass is an alloy of copper and nickel. nickel.

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.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.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.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.Complex X Of composition Cr(H2O)6Cln Has a spin only magnetic moment of 3.83 B. M. It reacts with AgNO3 And shows geometrical isomerism. The IUPAC nomenclature of X Is: JEE Main 2020 (09 Jan Shift 1) JEE Main Previous Year Paper (1) Hexaaqua chromium(III) chloride (2) Tetraaquadichlorido chromium(IV) chloride dihydrate (3) Dichloridotetraaqua chromium(IV) chloride (4) Tetraaquadichlorido chromium(III) chloride dihydrate dihydrate Q41. [Pd(F)(Cl)(Br)(I)]2− has n number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilization energy [CFSE] of [Fe(CN)6]n−6 , respectively, are: [Note: Ignore the pairing energy] (1) 2.84 BM and −16Δ0 (2) 5.92 BM and 0 (3) 1.73 BM and −2.0Δ0 (4) 0 BM and −2.4Δ0

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.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.Boron and silicon of very high purity can be obtained through : (1) liquation (2) zone refining (3) vapour phase refining (4) electrolytic refining

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 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]