Title P- BLOCK(13, 14).pdf ✅

UNIT 08 THE P-BLOCK ELEMENTS (GROUP 13 & 14) Exercise 1: NCERT Based Topic-wise MCQs 8.0 INTRDUCTION 1. Which of the following statement is/are correct? NCERT/ Page-315 (a) The difference in innercore of elements influences their physical properties. (b) p-Block consists of non-metal metalloids and metals. (c) Heaviest elements in p-Block are metallic in nature. (d) All of these 2. The element that shows greater ability to form pπ − pπ multiple bonds, is : NCERT/ Page-315 (a) Sn (b) C (c) Ge (d) Si 8.1 GROUP 13 ELEMENTS: THE BORON FAMILY 3. Which of the following is most abundant in the earth crust ? NCERT/Page-317 (a) Boron (b) Aluminium (c) Gallium (d) Thallium 4. The relationship between first, second and third ionisation enthalpies of each group-13 element is (a) ΔiH1 > ΔiH2 > ΔiH3 NCERT Page-317 (b) ΔiH1 < ΔiH2 < ΔiH3 (c) ΔiH1 = ΔiH2 > ΔiH3 (d) ΔiH3 > ΔiH1 > ΔiH2 5. Which of the following is/are true regarding gallium? (a) It has unusually low melting point ( 303K). NCERT Page-318 (b) It exist in liquid state during summer. (c) It has a high boiling point (2676K). (d) All the these 6. The element which shows least metallic character is (a) Indium (b) Boron (c) Aluminium (d) Gallium
7. Which of the following does not form M3+ ion? (a) Boron (b) Aluminium (c) Indium (d) Gallium 8. Thallium shows different oxidation states because (a) it is transition element NCERT/ Page-318 (b) of inert pair effect (c) of its amphoteric character (d) of its higher reactivity 9. The metal that has very low melting point and its periodic position is closer to a metalloid is : (a) Al NCERT/ Page-318 (b) Ga (c) Se (d) In 10. Aluminium vessels should not be washed with materials containing washing soda becauseNCERT/ Page-319 (a) washing soda is expensive (b) washing soda is easily decomposed (c) washing soda reacts with aluminium to form soluble aluminate (d) washing soda reacts with aluminium to form insoluble aluminium oxide 11. Amphoteric oxide among the following is NCERT Page-319 (a) B2O3 (c) In2O3 (b) Ga2O3 (d) Tl2O3 12. The electronegativity of aluminium is similar to: NCERT/ Page-318 (a) Carbon (b) Beryllium (c) Boron (d) Lithium 13. Choose the correct stability order of group 13 elements in their +1 oxidation state. NCERT/ Page-318 (a) Al < Ga < In < Tl (b) Tl < In < Ga < Al (c) Al < Ga < Tl < In (d) Al < Tl < Ga < In 14. Which metal is protected by a layer of its own oxide? NCERT/ Page-319 (a) Al (b) Ag (c) Au (d) Fe 15. Which of the following does not react with aqueous NaOH ? NCERT Page-319 (a) B (b) Al
(c) Ga (d) Tl 16. Which of the following hydroxide is acidic? (a) Al(OH)3 (b) Ca(OH)3 (c) Tl(OH)3 (d) B(OH)3 17. Which among the following oxides react with alkali? B2O3, Al2O3 and Tl2O (a) B2O3 and Al2O3 (c) Only B2O3 (b) Al2O3 and Tl2O (d) B2O3 and Tl2O 18. What is x in the following reaction? NCERT/ Page-319 Al(s) + NaOH(aq) + H2O(l) → x + H2(g) (a) Na2 [Al(OH)4 ] − (b) Na+[Al(OH)4 ] − (c) Na2 [Al(OH)6 ] (d) Na+[Al(OH)6 ] 8.2 IMPORTANT TRENDS AND ANOMALOUS PROPERTIES OF BORON 19. The strongest Lewis acid is NCERT/ Page-320 (a) BF3 (c) BBr3 (b) BCl3 (d) BI3 20. NH3 and BF3 form an adduct readily because they form NCERT/ Page-320 (a) a coordinate bond (b) a hydrogen bond (c) an ionic bond (d) a covalent bond 21. The factor responsible for weak acidic nature of B − F bonds in BF3 is NCERT Page-320 (a) large electronegativity of fluorine (b) three centred two electron bonds in BF3 (c) pπ − dπ back bonding (d) pπ − pπ back bonding 22. What is the oxidation state and hybridisation of boron in compound formed when BCl3 undergoes reaction with the water? (a) 3, sp 2d (b) 3, sp 3 (c) 4, sp 3 (d) 3, sp 2d
8.3 GROUP 14 ELEMENTS: THE CARBON FAMILY 23. Mark the oxide which is amphoteric in character NCERT/ Page-324 (a) CO2 (b) SiO2 (c) SnO2 (d) CaO 24. The inert pair effect is most prominent in NCERT/ Page-324 (a) C (b) Pb (c) Ge (d) Si 25. The most stable +2 oxidation state is exhibited by (a) Fe (b) Sn (c) Pb (d) Si 26. Least thermally stable is NCERT/ Page-324 (a) CCl4 (c) GeCl4 (b) SiCl4 (d) GeBr4 27. Which of the following halides is the most stable? NCERT Page-324 (a) CF4 (c) CBr4 (b) Cl4 (d) CCl4 28. Unlike the other elements of its group, carbon and silicon does not form MX2 type molecules because NCERT Page-324 (a) energetically this is not possible (b) carbon undergoes catenation (c) it is non-metallic (d) carbon does not contain d-orbital 29. Which of the following is/are not correctly matched ? NCERT Page-324 (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 30. The stability of dihalides of Si, Ge,Sn and Pb increases steadily in the sequence NCERT Page-324 (a) PbX2 ≪ SnX2 ≪ GeX2 ≪ SiX2
(b) GeX2 << SiX2 << SnX2 << PbX2 (c) SiX2 << GeX2 << PbX2 ≪< SnX2 (d) SiX2 ≪< GeX2 ≪< SnX2 ≪ PbX2. 31. 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 32. The elements commonly used for making transistors are (a) C and Si (b) Ga and In (c) P and As (d) Si and Ge 33. The element which is exclusively applied as semi-conductor (a) Au (b) Ge (c) Pt (d) Si 34. 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 [GeCl6 ] 2− ion 35. The main reason that SiCl4 is easily hydrolysed as compared to CCl4 is that NCERT/ Page-325 (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 36. Which halide is least stable and has doubtful existence NCERT/Page-324 (a) CI4 (b) GeI4 (c) SnI4 (d) PbI4 37. PbF4, PbCl4 exist but PbBr4 and PbI4 do not exist because of NCERT/Page-324 & 325 (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 −. 38. Lead pipes are readily corroded by (a) H2SO4 (c) CH3COOH (b) HCl (d) pure water 39. Lead pipes are not suitable for drinking water because