representative elements,transition elements & co-ordinate compounds

Representative elements, Transition elements and Co-ordination chemistryQuestions: 1. In the forth floatation process for the concentration of ores, the one particle float because (a) the are light (b) their surface is not easily wetted by water (c) they bear electrostatic charge (d) they are insoluble 2. Which of the following metals is obtained by leaching its one with dilute cyanide solution? (a) Ag (b) Zn (c) Te (d) V 3. In blast furnace, maximum temperature is in the zone of (a) fusion (b) combustion (c) reduction (d) slag formation 4. H2O2 cari not be prepared by the action of H2SO4 on (a) Na2O2 (b) BaO2 (c) PbO2 (d) NO2 5. Which of the following is the structure of H2O2? 6. The volume strength of 1.5 N H2O2 solution is (a) 4.8 (b) 8.4 (c) 3.0 (d) 8.0 7. An alkali metal is dissolved in liquid ammonia and the solution is allowed to stand. Which of the following statements is correct? (a) The solution remains intact. (b) The solution decomposes slowly to give hydrogen gas. (c) The blue colour of the solution changes to red. (d) The solution becomes more conducting. 8. Sodium oxide is (a) an acidic oxide (b) a basic oxide (c) an amphoteric oxide (d) not a true oxide 9. Which of the following statements is (are) correct (a) Solubility of alkaline earth metal carbonates decreases in the order BeCO3 > MgCO3 > CaCO3 > SrCO3 > BaCO3. (b) Thermal stability of carbonates increases in the order BeCO3 < MgCO3 < CaCO3 < SrCO3 < BaCO3. (c) Solubility of sulphates decreases in the order BeSO4 > MgSO4 > CaSO4 > SrSO4 > BaSO4. (d) The electropositive character of alkaline earth metals decreases in the order Be > Mg > Ca > Sr > Ba. 10. Which of the following processes is used in thermite welding? (a) Cr2O3 + 2Al Al2O3 + 2Cr (b) Fe2O3 + 2AlAl2O3 + 2Fe (c) 3Mn3O4 + 8Al4Al2O3 + 9Mn (d) MoO3 + 2Al Al2O3 + Mo 11. Which of the following is not isomophous with true alums? (a) K2SO4.Al2(SO4)3.24H2O (b) FeSO4.Al2(SO4)3.24H2O (c) (NH4)2SO4.Al2(SO4)3.24H2O (d) Na2SO4.Al2(SO4)3.24H2O 12. Graphite is a good conductor of electricity. This is due to (a) its layer structure (b) the presence of van der Waals’ forces between the two layers. (c) the presence of a half filled unhydridised p-oribital on each C atom. (d) the presence of metallic impurities in it. 13. Which of the following statements is/are not true for interstitial carbides? (a) These are formed by transition metals of groups 4, 5 and 6. (b) Their electrical conductivity increases with rise in temperature. (c) In these carbides, carbon atoms occupy octahedral holes in the lattice of metal atoms. (d) Carbon atoms present in the interstices change the characteristic properties of the metal forming the lattice. 14. The H-M-H bond angle in the hydrides of group 15 elements follows the order (a) NH3 > PH3 > AsH3 > SbH3 > BiH3 (b) NH3 < PH3 < AsH3 < SbH3 < BiH3 (c) NH3 > PH3 > AsH3 = SbH3 > BiH3 (d) PH3 > NH3 > AsH3 > SbH3 > BiH3 15. The basic strength of the hydrides of group 15 elements. (a) decreases on moving down the group (b) increases on moving down the group (c) first decreases upto AsH3 and then increases (d) first increases upto AsH3 and then decrease 16. Which of the following oxides is amphoteric in nature (a) N2O3 (b) P4O6 (c) Sb4O6 (d) Bi2O3 17. Which of the following statements is/are not correct? (a) The atomic radii of group 16 elements are smaller than those of the corresponding elements of group 15. (b) The density of group 16 elements decreases on moving down the group. (c) The melting point of Se is less than that of Po. (d) Sulphur exists as S8 molecule. 18. Assertion (A) : H2O is a strong reducing agent. Reason (R) : Oxygen is more electronegative than hydrogen. Both (A) and (R) are correct and (R) is the correct explanation of (A). Both (A) and (R) are correct but (R) is not the correct explanation of (A). (A) ic correct but (R) is incorrect. (A) is incorrect but (R) is correct. 19. The electron affinity values of halogens vary in the order: (a) F > Cl > Br > I (b) F < Cl < Br < I (c) F < Cl > Br > I (d) F > Cl < Br > I 20. Which of the following statements is/are correct? (a) Iodine has a metallic lusture. (b) Fluroine can not exist in +1 oxidation state (c) Chlorine can exhibit -1, +1, +3, +5 and +7 oxidation liquid. (d) Bromine is a yellowing liquid. 21. Which of the following statements is (are) incorrect? (a) The colour of halogens darkens on moving down the group. (b) Halogen molecules absorb light in the I.R. region. (c) Fluorine absorbs violet light and shows the complementary yellow colour. (d) Iodine absorbs red light and shows the complementary. 22. The oxyacid of bromine formed in +5 oxidation state is (a) hypobromous acid (b) bromous acid (c) bromic acid (d) perbromic acid 23. The state of hybridization of Cl in ClF3 and the shape of the molecules are (a) sp2, triangular planar (b) sp3, tetrahedral (c) sp2d, T-shaped (d) sp3d2, T-shaped. 24. Which of the following statements is/are correct? (a) XeF4 reacts with water to from XeO3. (b) The Xe atom present in XeFe4 is in a state of dsp2 hybridisation. (c) XeF4 posssesses a square planar geometry. (d) All the bonds present in XeF4 are -bonds. 25. Which of the following is not regarded as transition element? (a) Co (b) Pd (c) Cd (d) Au 26. The most common oxidation state of the elements belonging to the first transition series (except Sc) is: (a) +4 (b) +1 (c) +2 (d) +3 27. Which of the following ions is expected to exhibit the highest magnetic moment? (a) (b) (c) (d) 28. The magnetic moments of , follow the order (a) (b) (c) (d) 29. The transition metal ions have a great tendency to form complexes. This is due to (a) their small size (b) high nuclear charge (c) availability of vacant d-orbitals (d) none of these. 30. When H2S is passed through an acidified solution of , the product obtained is (a) S (b) SO2 (c) SO3 (d) H2SO4 31. When a mixture of and NaCl is heated with conc. H2SO4 and the vapour obtained are passed through water. (a) a yellow solution containing chromic acid is obtained (b) an orange red solution containing chromyl is obtained. (c) a yellow perceptible of pot. Chromate is obtained (d) a colourless solution containing HCl is obtained. 32. Chrome alum is (a) (NH4)2 SO4. Cr2(SO4)3.24H2O (b) K2SO4.Cr2(SO4)3.24H2O (c) Na2SO4.Cr2(SO4)3.24H2O (d) FeSO4. Cr2(SO4)3.24H2O 33. In neutral medium, the equivalent mass of KMnO4 is equal to (a) 158 (b) 79 (c) 52.7 (d) 31.4 34. In acidic medium and in the presence of a reducing agent, Mn gets reduced into (a) (b) MnO2 (c) (d) none of these 35. Which of the following is not an ore of iron? (a) Limonite (b) Siderite (c) Magnetite (d) Pyragyrite 36. Which of the following statements is not correct? (a) Quenching involves the heating of steel to redness and then plunging it into cold water. (b) Presence of silicon in steel provides it a fibrous structure. (c) Presence of Mn in steel decreases its tensile strength. (d) Annealing makes steel soft and ductile. 37. Stainless steel is an alloy of (a) Fe and C (b) Fe, Cr and C (c) Fe, Cr, Cu and C (d) Fe, Cr, Ni and C 38. The alloy steel used for making rock drills is (a) stainless steel (b) manganese steel (c) chrome-vanadium steel (d) alnico 39. The alloy having a very low coefficient of expansion is (a) invar (b) alnico (c) permalloy (d) tungsten steel. 40. The aqueous solution of Mohr’s law salt contains (a) (b) (c) (d) 41. Me Arthur Forrest cyanide process used for the extraction of silver and gold is a (a) self reduction process (b) carbon reduction process (c) electrolytic reduction process (d) hydrometallurgical process. 42. When white vitriod is heated to 100oC, the product obtained is (a) FeSO4.H2O (b) FeSO4.6H2O (c) ZnSO4.H2O (d) ZnSO4.6H2O 43. Elements placed after. Lanthanides in the periodic table (e.g. W, Re, Os etc.) have very high densities. This is due to (a) their high atomic numbers (b) their unique crystal lattices (c) lanthanide contraction (d) None of these 44. Assertion (A) : is diamagnetic. Reason (R) : The electrons are lost from 4s-orbitals to from . (a) Both (A) and (R) are correct and (R) is the correct explanation of (A) (b) Both (A) and (R) are correct but (R) is not the correct explanation of (A) (c) (A) is correct but (R) is incorrect. (d) (A) is incorrect but (R) is correct. 45. In nitroprusside ion, the iron and NO exist as Fe11 and rather than Fe11 and NO. These forms can be differentiated by. (a) estimating the concentration of iron (b) measuring the concentration of (c) measuring the solid state magnetic moment (d) thermally the solid state magnetic moment. 46. Oxidation state of Au in H[Ag(CN)2] is (a) +1 (b) +2 (c) +3 (d) +4 47. Which of the following is a bidentate ligand? (a) (b) (c) NH2CH2CH2NH2 (d) CO 48. Clycino (NH2CH2CO) is a (a) monodentate ligand (b) bidentate ligand (c) neutral ligand (d) cationic ligand 49. The IUPAC name of the complex NH4[Cr(NCS)4(NH3)2 is (a) tri (ethylenediamino) chromium (III) chloride (b) tri (ethylene diammine) chromium (III) chromium (c) tris (ethylene diammine) chromium (III) chromium (d) tri (ethylene diamine) chromium) chromium 50. IUPAC name of the complex NH4[Cr(NCS)4(NH3)2] is (a) Ammonium diamminetetra (thiocyanato-N) chromate (III) (b) Ammonium diamminetetra (thiocyanato-N) chromate (II) (c) Ammonium diamminetetra (thiocyanato-S) chromate (III) (d) Ammonium diamminetetra (thiocyanato-S) chromate (II) 51. Cu(NH3)4][PtCl4] and [Pt(NH3)4][CuCl4] exhibit. (a) ionization isomerism (b) linkage isomerism (c) coordination isomerism (d) none of these 52. Ni(CO)4 is a tetrahedral complex. The number of its geometrical isomers would be (a) 0 (b) 2 (c) 3 (d) 4 53. Which of the following types of square planar complex are unable to exhibit geometrical isomerism? (a) Ma2b2 (b) M(AB)2 (c) Ma4 (d) Mab3 where a and b are monodentate ligands and AB is a bidentate ligand). 54. According to the valence-bond theory, the metal-ligand bond is (a) purely ionic (b) purely covalent (c) coordinate covalent (d) dipole-dipole interaction 55. The state of hybridization of Ni in [Ni(CO)4] is (a) sp3 (b) dsp2 (c) dsp3 (d) sp3d2 56. Which of the following complexes does contain only one unpaired electron? (a) [Ni(CN)6] (b) [Ni(NH3)4]Cl2 (c) K2[Ni(CN)4] (d) [Fe(H2O)6]Cl2 57. The ligand used in the estimation of hardness of water is (a) thiocyanato (b) oxalate (c) en (d) EDTA 58. The formula of Zeise’s salt is (a) K[PtCl2( - C2H4)] (b) K[PtCl3 ( - C2H4)] (c) K[PtCl4 ( - C2H4)] (d) K[PtCl3 ( - C2H4)] 59. In metal carbonyls, the metal-carbon bond possesses (a) only character (b) only character (c) both (d) ionic character 60. Tetraethyl lead is used as (a) a medicine (b) a catalyst (d) an antiknock compound (d) a fungicide. ******* Keys: 1 c, d 2 b 3 b 4 c, d 5 b 6 b 7 b 8 b 9 a, b, c 10 b 11 b 12 c 13 d, d 14 a 15 a 16 c 17 b, c 18 d 19 c 20 a, b, c 21 b, d 22 c 23 c 24 b, d 25 c 26 c 27 c 28 d 29 a, b, c 30 a 31 a 32 b 33 c 34 c 35 d 36 c 37 d 38 d 39 a 40 d 41 d 42 c 43 c 44 b 45 c 46 c 47 c 48 b 49 d 50 b 51c 52a 53 c, d 54 c 55 a 56 d 57 d 58 d 59 d 60 c Answers: 21. Halogen molecules absorb light in the visible region. Fluorine absorbs violet radiation and show complementary yellow colour, whereas iodine absorbs yellow and green radiation and appears violet. 22. Bromic acid is HBrO3 27. configuration and consists of maximum number (5) unpaired electrons. 28. Number of unpaired electron present in are respectively 4, 3, 2 and 1. 31. 33.In neutral medium, Hence, equivalent mass = (Molecular mass)/3 34. In acidic medium 36. Presence of Mn in steel produces elasticity and increases its tensile strength. 52. Tetrahedral complex do not show geometrical isomerism because all the four ligands lie at the same distance from the central metal atom. Representative elements, Transition elements and Co-ordination chemistry 1 *** Mobile #. 98786-08983 ***