Title 11. The p-Block Elements (Group 13 and 14).pdf ✅

170 THE p-BLOCK ELEMENTS (GROUP 13 AND 14) 19. When Al is added to KOH solution (a) no action takes place (b) oxygen is evolved (c) water is produced (d) hydrogen is evolved 20. Which of the following does not react with aqueous NaOH ? (a) B (b) Al (c) Ga (d) Tl 21. Amphoteric oxide among the following is (a) B2O3 (b) Ga2O3 (c) In2O3 (d) Tl2O3 22. Boron forms covalent compound due to (a) higher ionization energy (b) lower ionization energy (c) small size (d) Both (a) and (c) 23. NH3 and BF3 form an adduct readily because they form (a) a coordinate bond (b) a hydrogen bond (c) an ionic bond (d) a covalent bond 24. The factor responsible for weak acidic nature of B–F bonds in BF3 is (a) large electronegativity of fluorine (b) three centred two electron bonds in BF3 (c) pS - dS back bonding (d) pS - pS back bonding 25. In borax bead test which compound is formed? (a) Ortho-borate (b) Meta-borate (c) Double oxide (d) Tetra-borate 26. The formula of mineral borax is (a) Na OB 742 (b) Na 2742 OH4.OB (c) Na 2742 OH5.OB (d) Na 10.OB 2742 OH 27. Which of the following hydroxide is acidic ? (a) Al(OH)3 (b) Ca(OH)3 (c) Tl(OH)3 (d) B(OH)3 28. Orthoboric acid (a) donate proton to form H2BO3 – (b) accept proton of form H4BO3 + (c) donate OH– to form H2BO2 + (d) accept OH– to form [B(OH)4 ] – 29. H3BO3 on heating up to 373 K yields: (a) boric anhydride (b) orthoboric acid (c) metaboric acid (d) tetraboric acid 30. Boric acid is polymeric due to (a) its acidic nature (b) the presence of hydrogen bonds (c) its monobasic nature (d) its geometry 31. B(OH)3 is (a) monobasic acid (b) dibasic acid (c) tribasic acid (d) triacidic base 32. Orthoboric acid when heated to red hot gives (a) metaboric acid (b) pyroboric acid (c) boron and water (d) boric anhydride 33. Which is false in case of boric acid H3BO3 ? (a) It acts as a tribasic acid. (b) It has a planar structure. (c) It acts as a monobasic acid. (d) It is soluble in hot water. 34. BCl3 does not exist as dimer but BH3 exists as dimer (B2H6 ) because (a) chlorine is more electronegative than hydrogen (b) there is pS-pS back bonding in BCl3 but BH3 does not contain such multiple bonding (c) large sized chlorine atoms do not fit in between the small boron atoms where as small sized hydrogen atoms get fitted in between boron atoms (d) None of the above 35. In reaction BF3 + 3LiBH4 o 3LiF + X ; X is (a) B4H10 (b) B2H6 (c) BH3 (d) B3H8 36. Inorganic benzene is (a) NHB 333 (b) BH NH33 (c) NHB 363 (d) NBH 633 37. The structure of diborane ( B2H6 ) contains (a) four 2c-2e bonds and four 3c-2e bonds (b) two 2c-2e bonds and two 3c-3e bonds (c) two 2c-2e bonds and four 3c-2e bonds (d) four 2c-2e bonds and two 3c-2e bonds 38. In diborane (a) 4–bridged hydrogens and two terminal hydrogens are present (b) 2– bridged hydrogens and four terminal hydrogens are present (c) 3–bridged and three terminal hydrogens are present (d) None of these 39. Diborane upon hydrolysis gives (a) boric anhydride (b) metaboric acid (c) orthoboric acid (d) boron oxide 40. Borazole is known as (a) organic benzene (b) organic xylene (c) inorganic benzene (d) inorganic xylene 41. The compounds of boron and hydrogen are collectively called (a) diboranes (b) borazoles (c) boracits (d) boranes 42. The bonds present in borazole or inorganic benzene are (a) 9 V, 6S (b) 12 V, 3S (c) 6 V, 9S (d) 15 V only 43. The two type of bonds present in B2H6 are covalent and (a) ionic (b) co-ordinate (c) hydrogen bridge bond (d) None of these 44. Reaction of diborane with ammonia gives initially (a) B2H6 .NH3 (b) Borazole (c) B2H6 .3NH3 (d) [BH2 (NH3 ) 2 ] + [BH4 ] – EduHulk THE p-BLOCK ELEMENTS (GROUP 13 AND 14)
THE p-BLOCK ELEMENTS (GROUP 13 AND 14) 171 45. Which of the following compounds is not matched correctly with its structure? (a) H – N H – B H B N H N – H B – H – Borazine (b) H H B B H H H H – Diborane (c) Cl Cl Al Cl Al Cl Cl Al – Aluminium chloride (d) Cl Cl B – Cl – Boron trichloride 46. The electronic configuration of four different elements is given below. Identify the group 14 element among these (a) [He] 1 2s (b) [Ne] 2 3s (c) [Ne] 2 2 3s 3p (d) [Ne] 2 5 3 3 s p 47. Which of the following is most electronegative? (a) Pb (b) Si (c) C (d) Sn 48. Which of the following isotope of carbon is radioactive? (a) 12C (b) 13C (c) 14C (d) All of these 49. Carbon and silicon belong to group 14. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to (a) large size of silicon (b) more electropositive nature of silicon (c) availability of d-orbitals in silicon (d) Both (a) and (b) 50. The inert pair effect is most prominent in (a) C (b) Pb (c) Ge (d) Si 51. The most stable +2 oxidation state is exhibited by (a) Fe (b) Sn (c) Pb (d) Si 52. Which of the following lead oxides is present in ‘Sindhur’? (a) PbO (b) PbO2 (c) Pb O2 3 (d) Pb O3 4 53. Mark the oxide which is amphoteric in character (a) CO2 (b) SiO2 (c) SnO2 (d) CaO 54. Red lead is (a) Pb3O4 (b) Pb2O3 (c) Pb2O (d) PbO 55. The oxide of lead used in lead accumulators is (a) PbO (b) Pb2O3 (c) Pb3O4 (d) PbO2 56. Which of the following is/are not correctly matched ? (i) GeO2 – Acidic (ii) PbO2 – Amphoteric (iii) CO – Neutral (iv) SiO2 – Amphoteric (a) (i) and (iv) (b) (iv) only (c) (ii) only (d) (iii) only 57. Least thermally stable is (a) CCl4 (b) SiCl4 (c) GeCl4 (d) GeBr4 58. Unlike the other elements of its group carbon and silicon does not form MX2 type molecules because (a) energetically this is not possible (b) carbon undergoes catenation (c) it is non-metallic (d) carbon does not contain d-orbital 59. Which of the following halides is the most stable? (a) CF4 (b) CI4 (c) CBr4 (d) CCl4 60. The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence (a) PbX SnX GeX SiX 2 2 22 (b) GeX2 << SiX2 << SnX2 << PbX2 (c) SiX2 << GeX2 << PbX2 << SnX2 (d) SiX2 << GeX2 << SnX2 << PbX2 . 61. Which of the following is not correct? (a) Ge(OH)2 is amphoteric (b) GeCl2 is more stable than GeCl4 (c) GeO2 is weakly acidic (d) GeCl4 in HCl forms [ GeCl2 ] 2– ion 62. The main reason that SiCl4 is easily hydrolysed as compared to CCl4 is that (a) Si-Si bond is weaker (b) SiCl4 can form hydrogen bonds (c) SiCl4 is covalent (d) Si can extend its coordination number beyond four 63. Which halide is least stable and has doubtful existence (a) CI4 (b) GeI4 (c) SnI4 (d) PbI4 64. PbF4 , PbCl4 exist but PbBr4 and PbI4 do not exist because of (a) large size of Br– and I– (b) strong oxidising character of Pb4+ (c) strong reducing character of Pb4+ (d) low electronegativity of Br– and I– . EduHulk THE p-BLOCK ELEMENTS (GROUP 13 AND 14)
172 THE p-BLOCK ELEMENTS (GROUP 13 AND 14) 65. Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order : (a) C > Si > Ge > Sn (b) C >> Si > Ge | Sn (c) Si > C > Sn > Ge (d) Ge > Sn > Si > C 66. The catenation tendency of C,Si and Ge is in the order Ge < Si < C.The bond energies (in kJ 1 mol ) of C-C,Si-Si and Ge-Ge bonds, respectively are (a) 167, 180, 348 (b) 180, 167, 348 (c) 348, 167, 180 (d) 348, 180, 167 67. Lead pipes are readily corroded by (a) SOH 42 (b) HCl (c) CH3COOH (d) pure water 68. Lead pipes are not suitable for drinking water because (a) lead forms basic lead carbonate (b) lead reacts with water containing air to form Pb(OH)2 (c) a layer of lead dioxide is deposited over pipes (d) lead reacts with air to form litharge 69. The reducing power of divalent species decreases in the order (a) Ge > Sn > Pb (b) Sn > Ge > Pb (c) Pb > Sn > Ge (d) None of these 70. The element that does not show catenation among the following p-block elements is (a) carbon (b) silicon (c) germanium (d) lead 71. How many six membered and five membered rings are present in fullerene? (a) Six membered = 20, five membered = 10 (b) Six membered = 20, five membered = 12 (c) Six membered = 25, five membered = 10 (d) Six membered = 12, five membered = 25 72. Which of the following is the pure form of carbon ? (a) Diamond (b) Fullerene (c) Graphite (d) All three forms are equally pure 73. Which one of the following is not an allotrope of carbon ? (a) Carborundum (b) Diamond (c) Soot (d) Graphite 74. Which of the following types of forces bind together the carbon atoms in diamond ? (a) Ionic (b) Covalent (c) Dipolar (d) van der Waal’s 75. Carborundum is (a) SiC (b) CaC2 (c) Mg2C3 (d) None of these 76. Buckminster fullerene is (a) pure graphite (b) C-60 (c) diamond (d) C-90 77. The hybridisation state of carbon in fullerene is (a) sp (b) sp2 (c) sp3 (d) sp3d 78. The number of carbon atoms in Buckminsterfullerene is (a) 50 (b) 350 (c) 60 (d) 70 79. Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite (a) is an allotropic form of diamond (b) has molecules of variable molecular masses like polymers (c) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak inter plate bonds (d) is a non-crystalline substance 80. In graphite, electrons are (a) localised on every third C-atom (b) present in anti-bonding orbital (c) localised on each C-atom (d) spread out between the structure 81. The elements commonly used for making transistors are (a) C and Si (b) Ga and In (c) P and As (d) Si and Ge 82. The element which is exclusively applied as semi-conductor (a) Au (b) Ge (c) Pt (d) Si 83. Glass is a (a) liquid (b) solid (c) supercooled liquid (d) transparent organic polymer 84. Glass reacts with HF to produce (a) SiF4 (b) H2 SiF6 (c) H2 SiO3 (d) Na3AlF6 85. Producer gas is the mixture of (a) CO + N2 (b) CO + H2 (c) CO + water vapours (d) N2 + CH4 86. Coal gas is a mixture of (a) H2O and CO (b) H2 2 4 ,CO, N and CH (c) H2 and CO (d) CH4 and CO 87. Crystalline form of silica is called (a) crystalline silicon (b) quartz (c) rock (d) talc 88. Dry ice is (a) solid SO2 (b) solid NH3 (c) solid O2 (d) solid CO2 89. In silica (SiO2 ), each silicon atom is bonded to (a) two oxygen atoms (b) four oxygen atoms (c) one silicon and two oxygen atoms (d) one silicon and three oxygen atoms EduHulk THE p-BLOCK ELEMENTS (GROUP 13 AND 14)