CBSE Class 11 Chemistry p Block Elements MCQs Set A

CBSE Class 11 Chemistry p Block Elements MCQs Set A. CBSE and NCERT students can refer to the attached file. All educational material on the website has been prepared by the best teachers having more than 20 years of teaching experience in various schools. The study material available on our website for all CBSE classes and subjects have been prepared by teachers from all over the country. All study material has been carefully designed keeping into mind the latest CBSE examination trends.  


I. MCQ - Choose Appropriate Alternative

1. Which metal is used in the thermal process because of its activity.

(A) Iron (B) Copper (C) Aluminum (D) Zinc

2. Aluminum oxides is

(A) Acidic oxide (B) Basic oxide (C) Amphoteric oxide (D) None of these

3. Chemical composition of colemnite is.

(A) Ca2B6O11. 5H2O (B) CaB4O7. 4H2O (C) Na2B4O7. 4H2O (D) CaNaB5O9. 8H2O

4. Which element forms an ion with charge 3+.

(A) Beryllium  (B) Aluminum (C) Carbon (D) Silicon

5. Which element among the following belongs to Group IVA of the periodic Table.

(A) Barium (B) Iodine (C) Lead (D) Oxygen

6. Boric acid cannot be used.

(A) As antiseptic in medicine (B) For washing eyes 

(C) In soda bottles (D) For enamels and glazes

7. Which of the following elements is not present abundantly in earth's crust.

(A) Silicon (B) Aluminum (C) Sodium (D) C

8. The chief Ore of aluminum is.

(A) Na3AIF6 (B) Al2O3. 2H2O (C) l2O(D) Al2O3. H2O

9. The Group IIA of the periodic table comprises the elements.

(A) Boron, aluminum, gallium, indium and thallium. (B) Boron gallium, thallium.

(C) Aluminum, calcium, strontium. (D) All of the above

10. Boron is non-metallic because of

(A) Large size and higher nuclear change (B) Small size and higher nuclear charge

(C) Small size and smaller nuclear charge (D) None of the above

11. The increase in the atomic size in group is

(A) Regular (B) Irregular(C) Both  (D) None of the above

12. Orthoboric Acid is a mineral of.

(A) Aluminum (B) Silicon (C) Calicium (D) Boron

13. Aluminum is the third most abundant elements in earth crust after.

(A) Oxygen (B) Silicon (C) None of the above (D) Both of the Both

14. Bauxite is an ore of.

(A) Aluminum (B) Boron (C) Carbono (D) Gallium

15. Which of the elements of Group IIA are rare and only obtained as by-products.

(A) Gallium thallium (B) Thallium indium (C) Gallium indium (D) Gallium thallium indium

16. Borax is the sodium salt of tetraboric acid. It is most important of all among.

(A) Borates (B) Carbonates (C) Bicarbonates (D) None of the above

17. Borax occurs as natural deposit called tincal in the dried up lakes of.

(A) Tibet (B) California (C) Tibet & California (D) Virginia

18. Group IV A of the periodic table comprises elements.

(A) Carbon silicon (B) Tin, carbon , silicon

(C) Carbon, silicon, tin and lead (D) None of the above

19. The non-metals in Group IV A are.

(A) Carbon, silicon (B) Tin and Lead (C) All of the above D) None of the above

20. The elements of Group IV A are character sized by a set of .

(A) Three valence shell electrons (B) Four valence shell electrons

(C) Five valence shell electrons (D) Two valence shell electrons

21. Group IV A elements form.

(A) Super oxide (B) Oxides (C) Dioxide (D) All of the above

22. The property of catenation among the carbon and silicon .

(A) Increase on moving down the group form carbon to lead (B) Decrease on moving down the group from lead to carbon.

(C) Decreases on moving down the group from carbon to lead (D) Stable on moving down the group from carbon to lead.

23. The oxides of carbon are

(A) CO and CO(B) CO, CO2 and C3O2 carbon sub oxide

(C) CO, CO2, C2C(D) None of the above

24. China wares are made form a mixture of

(A) Kaolin and bone ash

(B) Kaolin and feldspar

(C) Kaolin feldspar and bone ash

(D) None of the above

25. Various oxides are used as pigments in the pigments of which element.

(A) Oxides of lead, basic lead carbonate etc.

(B) Various oxides of lead

(C) Various oxides of lead, basic lead carbonate, lead chromate

(D) Oxides of aluminum

26. Boron occurs in traces and has been found to be important for the growth of.

(A) Plants of many kinds

(B) Plants and animals

(C) Animals

(D) None of the above

27. Semiconductors conduct electricity better than.

(A) Conductors (B) Insulators

(C) Both of the above (D) None of the above

28. Oxygen is the abundant element in earth crust?

(A) Most of all

(B) 2nd in number

(C) Third most abundant

(D) 4th most abundant

29. Substance which is found in dried up lakes of Tibet and California is______

a) Tincal                        b) Boric Acid

c) Calcium carbonate     d) All

30. Boron is a white crystalline solid and it is________

a) More soluble in cold water

b) More soluble in hot water

c) More soluble in water

d) Soluble only in organic solvents

31. One of the outstanding features of boron is ability to form________

a) Molecular addition compounds

b) Molecular crystals

c) Semiconductors

d) All

32. Which of the following does not give Borax bead test?

a) Cub) Cr c) Ni d) Al

33. The metal which is used in thermite process because of its activity is_

a) Iron b) Copper c) Aluminium d) Zinc

34. Which of the following shows inert pair effect?

a) Boron b) Carbon c) Silicon d) Tin

35. Tincal is a mineral of____________

a) Al b) Si c) B d) C

36. Because of its ability to combine with both oxygen and nitrogen, aluminium metal is used

a) As nitrometer b) To remove air bubbles from molten metal c) To produce alloy d) All

37. Silicon differ from silica by a group of _________

a) CH3 b) –OH c) OCH3 d) O2

38. Boron in soil has been considered essential specially for________

a) Soil porosity

b) Proper growth of plants

c) Alkalinity of soil

d) All

39. Special feature of borate glass is that it is ______

a) Heat resistant  b) Low melting

c) Used to prepare chemical garden  d) All

40. Inp–block elements,thes–electronsofoutershelloftheheaviermembersarefailedtoparticipateinbonding, because they

a) Remain paired b) Remain unpaired

c) Are free d) None of these

41. The tendency of the pair of S – electron to remain inert increase with the increase in

a) Atomic number b) Atomic weight c) E.N d) I.P

42. Boron does not easily form cations, because it has the tendency to form bond like non-metal

a) Ionic bond b) Metallic bond

c) Hydrogen bond d) Covalent bond

43. Boron is metalloid and semiconductor like

a) Be b) K c) Si d) Al

44. Which element is unstable in air and is oxidized superficially in air

a) Aluminum b) Thallium

c) Gallium d) Indium

45. Crystalline boron has structure

a) Cubic b) Monoclinic

c) Hexagonal d) Trigonal

46. The hydrides B2H6 and Si2H6 are said to

a) Ionic hydrides b) Complex hydrides

c) Interstitial hydrides d) Covalent hydrides

47. The compound, which is used in borax bead test for cations analysis, is

a) NaOH b) H3BO3

c) Na2B4O7.10H2O d) H2B4O7

48. Orthoboric acid is weak acid because it

a) Accepts OH-1 ion b) Donate OH-1 ion

c) Accept H+1 d) Donate H+1

49. The aqueous solution of which acid is used for washing eyes?

a) H2B4O7 b) HCl

c) H3BO3 d) HBO2

50. The process in which Bauxite is purified by dissolving it in 45% aqueous NaOH at 150oC to separateinsoluble iron oxide as red mud is called

a) Hall’s process b) Baeyer’s process

c) Arrhenius process d) Grignard process

51. Bauxite is an oxide mineral of

a) Cu b) Ag

c) Al d) Zn

51. Bauxite is an oxide mineral of

a) Cu b) Ag

c) Al d) Zn

52. AlCl3 and GaCl3 are covalent when anhydrous because

a) They belong to group III A

b) Their ions have small size and high charge

c) They have high I.P

d) None of these

53. In the electrolysis of alumina is mixed with Cryolite(Na3AlF6) and fluorspar(CaF2) in the ratio of 20:60: 20. the function of the Cryolite and fluorspar is

a) To decrease the fusion temperature of alumina and to make good conductor of electricity

b) To dissolve alumina

c) To dissolve sodium

d) To increase the ionization of alumina

54. Termite is a mixture of

a) Iron oxide and aluminum

b) Iron oxide and copper

c) Copper oxide and aluminum

d) None of these

55. In aluminum termite process, aluminum acts as a

a) Reducing agent b) Oxidizing agent

c) A flux d) None of these

56. Which aluminium alloy is extremely light?

a) Duralumin b) Alnico

c) Magnalium d) Aluminium bronze

57. Cupric oxide on heating with B2O3 yields blue colored beads in the oxidizing flame because

a) Cupric borates are white in color

b) Cupric borates are black in color

c) Cupric borates are green in color

d) Cupric borates are blue in color

58. In mordenting aluminium ions (Al+3) are precipitated on the cloth as

a) Al2O3 b) AlN

c) Al(OH)3 d) AlCl3

59. Platinum metal can be dissolved in

a) Hot con HCl

b) Hot con H2SO4

c) Hot con HNO3

d) A mixture of Con. HCl and con HNO3

60. Which of the following can form nitride, which react with water to give ammonia?

a) Boron b) Gallium

c) Indium d) Thallium

61. The weak acid, which cannot be titrated with standard alkies, is

a) HCl b) H2SO4

c) H3BO3 d) All of these

62. Carbon differs from other members of its group due to smaller atomic size,higher electro negativity and the absence of

a) s – electrons b) p – electrons

c) d – electrons d) All of these

63. Aqua regia is a mixture of concentrated HNO3 and concentrated HCl in the ratio of

a) 3 : 1 b) 1 : 3

c) 2 : 3 d) 3 : 2

64. In land storage batteries, the acid used is

a) Con HCl b) Dil.HCl

c) Con H2SO4 d) Dil H2SO4

65. The dry ice is a compound of

a) Solid ice with any water

b) Solid SO2

c) Solid CO2

d) Solid C6H6

66. In the contact process for the manufacturing of H2SO4, the catalyst used is

a) Cu b) Ni

c) Pt d) N2O5

67. The depositing layer in tin plating is

a) Cu b) Sn  c) Al d) Ni

68. Ortho boric acid on heating at 100oC yields

a) Meta boric acid

b) Pyroboric acid

c) Tetra boric acid

d) Boric anhydride acid (B2O3)

69. Which of the following is used in photographic film?

a) MgBr2 b) NaCl

c) AgBr d) Na2S2O3

70. Aluminum does not react with HNO3 at any concentration and therefore HNO3 is transported in aluminum containers, this is due to formation of protective layer of

a) Cupric oxide b) Ferric oxide

c) Aluminum oxide d) Aluminum nitride

71. Action of aqua regia on noble metals is due to

a) HNO3 b) HCl

c) H2SO4 d) Chlorine

72. Phosgene is a poisonous gas, its chemical name is

a) Carbon dioxide b) Phosphonyl chloride

c) Carbon monoxide d) Carbonyl chloride

73. The maximum inert pair effect is shown by

a) B b) Al c) Ga d) Tl

74. Quartz is the polymeric form of

a) (SiO2)n b) (CO2)n

c) (CH2 – CH2)n d) None of these

75. If a metal is protected by an oxide layer from further attack, the metal is said to be

a) Reactive b) Active c) Passive d) Attractive

76. Carbon reacts with metals to form

a) Hydrides b) Oxides

c) Hydroxides d) Carbide

77. The control addition of III A and IV A members in Silicon and Germanium is known as

a) Inert pair effect b) Doping

c) Litharge d) Red lead

78. P – type of semi conductor are formed by mixing Silicon or Germanium with members of

a) III A b) IV A c) V A d) VI A

79. Litharge is chemically

a) PbO b) PbO2

c) Pb3O4 d) Pb(CH3COO)

80. The Octet rule is not followed by

a) Boron on BCl3 b) Oxygen in H2O

c) Nitrogen in NH3 d) Phosphorus in PH3

81. Which of the following elements show oxidation state of + 3 only?

a) B b) Ga c) In d) Ti

82. ______ of the following is not metallic in nature.

a) Boron b) Aluminum c) Indium d) Thallium

83. The oxides of Boron are ______ in nature.

a) Acidic b) Basic c) Neutral d) None of these

84. Orthoboric acid on heating to about 100oC looses a water molecule to form ______

a) Metaboric acid

b) Pyroboric acid

c) Metaboric and pyroboric acid

d) None of these

85. The function of Fluorspar in the electrolytic reduction of alumina dissolved in fused cryolite (NA3 AlF6) is

a) As a catalyst

b) To lower the temperature of the melt and to make the fused mixture conducting.

c) To decrease the rate of oxidation of carbon at the anode.

d) None of the above

86. Which of the following statements is correct?

a) H3PO3 is dibasic and reducing

b) H3PO3 is tribasic and reducing

c) H3PO3 is tribasic and non – reducing

d) H3PO3 is dibasic and non – reducing

87. Boric acid is

a) Weak monobasic Lewis acid

b) Only weak monobasic Arhenius acid

c) Only weak monobasic Bronsted acid

d) Only weak tribasic Arrhenius acid

88. The reduction of metal oxides is sometimes accomplished by using aluminum in the

a) Goldschmidt’s reaction

b) Silberchemdit’s reaction

c) Baeyer’s reaction

d) Zilch’s reaction

89. Hall’s process is based on electrolysis of

a) Alumina b) Gypsum

c) Borax d) None of these

90. _______ is a better conductor of heat.

a) Fe b) Sn c) Al d) None of these



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