P – BLOCK ELEMENTS – 12

1) Which of the following statements is correct ?
a)
b)
c)
d)

2) Which of the following is not a Lewis acid ?
a)
b)
c)
d)

3) Which of the following is a Lewis acid ?
a)
b)
c)
d)

4) A three-centred bond is present in
a)
b)
c)
d)

5) AICI3 is
a) Anhydrous and covalent
b) Anhydrous and ionic
c) Covalent and basic
d) Coordinate and acidic

6) Which of the following does not give a borax bead test ?
a) Chromium
b) Ferrous salt
c) Sodium
d) Cobalt

7) 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 the above

8) AICI3 on hydrolysis gives
a)
b)
c)
d)

9) Fluorine is more electronegative than either boron or phosphorus. What conclusion can be drawn from the fact that BF3 has no dipole moment but PF3 does ?
a)
b)
c) The atomic radius of P is larger than that of B
d)

10) Identify the statement that is not correct as far as the structure of diborane is concerned
a) There are two bridging hydrogen atoms and four terminal hydrogen atoms in diborane
b) Each boron atom forms four bonds in diborane
c) The hydrogen atoms are not in the same plane in diborane
d) All B—H bonds in diborane are similar

11) Anhydrous AICI3 is prepared from
a) Conc. HCI and Al metal
b)
c) Dry HCI gas + heated Al metal
d) Dil. HCI and Al metal

12) The action of caustic soda on aluminium hydroxide gives a compound having the formula
a)
b)
c)
d)

13) Corundum is
a)
b)
c)
d)

14) The state of hybridization of B in BCI3 is
a)
b)
c) sp
d)

15) The type of hybridization of boron in diborane is
a) sp
b)
c)
d)

16) A metal ion M3+ loses 3 electrons. Its oxidation number will be
a) -3
b) + 6
c) 0
d) -3

17) Which of the following is electron deficient ?
a)
b)
c)
d) None of these

18) The shape and hybridization of BF3 are
a)
b)
c)
d)

19) 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

20) Aluminium chloride is a/an
a) Bronsted-Lowry acid
b) Arrhenius acid
c) Lewis acid
d) Lewis base

21) Which of the following acts as an oxidising agent ?
a)
b)
c)
d) None

22) TII3 is an ionic compound which furnishes the following ions in solution:
a)
b)
c)
d)

23) Thallium tribromide is slowly converted to one of the following species at room temperature:
a) TIBr
b)
c)
d)

24) Hydrated aluminium chloride is ionic and soluble in water, giving
a)
b)
c)
d) None of these

25) “Ammonal” used in bombs is a mixture of
a)
b)
c)
d)

26) Anodized aluminium is aluminium
a) Obtained on anode
b) Electrolytically coated with aluminium oxide
c) Alloy of aluminium containing 95% of Al
d) None of the above

27) Which of the following compounds can make cloth fire proof ?
a) Aluminium sulphate
b) Ferrous sulphate
c) Manganese sulphate
d) Cuprous sulphate

28) The alumina-silica clay called bentonite is dropped from aeroplanes in the slurry form for
a) Fertilizing the soil
b) Spreading water over fires
c) Cooling the soil
d) Fumigation

29) In aluminates, the coordination number of Al is
a) 4
b) 6
c) 3
d) 1

30) Which one of the following boron compounds is optically active ?
a) Boron trifluoride
b) Boron anhydride
c) Borosalicylic acid
d) Sodium tetraborate

31) Rubies and sapphire are chemically
a)
b)
c)
d)

32) The blue coloured mineral Lapis Lazuli which is used as a semiprecious stone is a mineral of the following class
a) Sodium aluminosilicate
b) Zinc cobaltate
c) Basic copper carbonate
d) All the above

33) The dissolution of Al (OH)3 by a solution of NaOH results in the formation of
a)
b)
c)
d)

34) The outermost ground state electronic configuration of group 14 (IVA) elements is

a)
b)
c)
d)

35) Germanium has the electronic configuration
a)
b)
c)
d)

36) The first ionization energies of Na, Mg, Al and Si are in the order
a) Na < Mg > Al < Si
b) Na > Mg > Al > Si
c) Na < Mg < Al > Si
d) Na > Mg > Al < Si

37) The first ionization energy of silicon is lower than that of
a) Aluminium
b) Carbon
c) Potassium
d) Calcium

38) Which property is not exhibited by carbon in its compounds ?
a) Forming bonds to other carbon atoms
b) Forming multiple bonds
c) Exhibiting allotropic forms
d) Forming compounds with coordination number beyond four

39) Catenation involves the
a) Formation of cations
b) Deposition of cations
c) Formation of long chains of identical atoms
d) Formation of covalent bonds

40) Which element-element bond has the highest bond dissociation energy ?
a) C-C
b) Si-Si
c) Ge-Ge
d) Sn-Sn

41) Which of the following group 14 element shows the maximum tendency towards catenation ?
a) Lead
b) Germanium
c) Silicon
d) Carbon

42) The elements of group 14
a) Exhibit an oxidation state of + 4
b) Exhibit oxidation states of + 4 and +2
c)
d)

43) The inert pair effect is most prominent in
a) Ge
b) Si
c) Sn
d) Pb

44) Which is the correct statement about Pb ? It shows oxidation states of
a) + 2, + 4
b) +1, +2
c) + 3, + 4
d) Only + 4

45) Carbon is a typical
a) Metal
b) Non-metal
c) Metalloid
d) None of these

46) Silicon has the characteristics of a
a) Metal
b) Non-metal
c) Metalloid
d) None of these

47) The metallic character of group 14 elements
a) Decreases from top to bottom
b) Increases from top to bottom
c) Does not change gradually
d) Has no significance

48) The electronic configuration of two neutral atoms (A and B) are given below :

A = 1s22s22p2
and B = [Ne]3s23p2
The nature of the bond between A and B is mostly
a) Covalent
b) Electrovalent
c) Coordinate
d) Metallic

49) Carbon has no tendency to form complex compounds because of
a) Its small size
b) The availability of d-orbitals
c) The non-availability of vacant d-orbitals
d) Its tendency to form covalent bonds

50) Which of the following elements has a greater tendency to show a + 2 oxidation state ?
a) Lead
b) Carbon
c) Silicon
d) Germanium

51) Which of the following statements is not true for carbon ?
a) It forms compounds with multiple bonds
b) Its ionization energy is very high
c) It undergoes catenation
d) It shows the inert pair effect

52) The element/s which is/are used as semiconductors in transistors is/are:
a) Sn
b) Si
c) Ge
d) Both (b) and (c)

53) The general trend in the properties of elements of carbon family shows that with the rise in atomic number .
a) The tendency towards catenation increases
b) The tendency to show + 2 oxidation state increases
c) The metallic character decreases
d) The tendency to form complexes with covalency higher than four decreases

54) The stability of + 2 oxidation state of lead can be explained on the basis of
a) Electronic configuration
b) Inert pair effect
c) Resonance
d)

55) Amongst the elements of group 14, the reducing power of the divalent species decreases in the order
a) Ge > Sn > Pb
b) Sn > Ge > Pb
c) Pb > Sn > Ge
d) Sn > Pb > Ge

56) Amongst the elements of group 14, the oxidising power of the tetravalent species increases in the order
a) Ge < Pb < Sn
b) Ge < Sn > Pb
c) Pb < Ge < Sn
d) Ge < Sn < Pb

57) The non existence of Pbl4 is due to the
a)
b)
c)
d) Both (b) and (c)

58) Of the following, the most stable hydride is
a)
b)
c)
d)

59) The reducing character of the hydrides of group 14 elements is
a)
b)
c)
d)

60) Which of the following elements forms a large number of stable hydrides ?
a) Carbon
b) Silicon
c) Germanium
d) Tin

61) A compound in which the oxidation number of carbon is zero is
a)
b)
c)
d) No such compound is possible.

62) The oxidation number of carbon in CH2O is
a) -2
b) + 2
c) Zero
d) – 4

63) The type of bonding present in tetravalent compounds of group 14 elements is
a) Ionic
b) Metallic
c) Covalent
d) Hydrogen

64) The shape of the tetrahalides of group 14 elements is
a) Square planar
b) Trigonal bipyramid
c) Octahedral
d) Tetrahedral

65) Which of the following does not exist ?
a)
b)
c)
d)

66) The tetrahalides of group 14 elements except that of carbon act as

a) Strong Lewis bases
b) Strong Lewis acids
c) Strong oxidising agents
d) None of these

67) The compound formed when stannic chloride is treated with conc. HCI is
a)
b)
c)
d)

68) The most commonly used reducing agent in the laboratory is
a)
b)
c)
d)

69) Which of the following will not be hydrolysed easily ?
a)
b)
c)
d)

70) SiCI4 is easily hydrolysed but CCI4 is not. This is because
a)
b) Silicon is non-metallic
c) Silicon can extend its coordination number beyond four but carbon cannot
d) Silicon can form hydrogen bonds but carbon cannot

71) Diamond and graphite are the
a) Isotropic forms of carbon
b) Allotropic forms of carbon
c) Amorphous forms of carbon
d) Isomeric forms of carbon

72) Diamond and graphite are shown to be allotropic forms of carbon by the fact that

a) Diamond is hard but graphite is soft
b) Diamond is transparent while graphite is opaque
c) They have different crystal structures
d)

73) Which crystalline form of carbon has a two dimensional sheet like structure ?
a) Coal
b) Coke
c) Diamond
d) Graphite

74) The nature of chemical bonding in graphite is
a) Covalent
b) Ionic
c) Coordinate
d) Metallic

75) The different layers in graphite are held together by
a) Ionic bonding
b) Metallic bonding
c) Covalent bonding
d)

76) The carbon atoms in graphite are
a)
b) sp-Hybridized
c)
d) None of these

77) The carbon atoms in diamond are arranged in a/an
a) Planar configuration
b) Tetrahedral configuration
c) Linear configuration
d) Octahedral configuration

78) Graphite is
a) Harder than diamond
b) A bad conductor of electricity
c) Used as a lubricant
d) An amorphous allotropic form of carbon

79) The element which occurs both in very hard and very soft forms is
a) Si
b) C
c) Sn
d) Pb

80) Lead pencils contain
a) Lead
b) Lead sulphide
c) A mixture of lead and silica
d) Graphite

81) The most reactive form of carbon is
a) Charcoal
b) Graphite
c) Diamond
d) Coal

82) Carborundum is
a) Boron carbide
b) Silicon carbide
c) Calcium cardide
d) Aliuminium cardide

83) Silica readily dissolves in
a) HF
b) HCl
c) Aqua regia
d) HI

84) The most impure form of carbon is
a) Animal charcoal
b) Lamp black
c) Graphite
d) Wood charcoal

85) Which of the following gases is needed by plants for photosynthesis ?
a)
b)
c) CO
d)

86) Carbon in carbon dioxide is
a) sp-Hybridized
b)
c)
d)

87) The antidote to CO poisoning is
a) Carborundum
b)
c) Carbogen
d) Carbonyl chloride

88) Which of the following oxides is not amphoteric ?
a)
b)
c)
d)

89) Carbon monoxide is
a) Acidic
b) Neutral
c) Amphoteric
d) Basic

90) Which of the following is an important constituent of transistors ?
a) Os
b) Ge
c) Sn
d) Pb

91) CO forms a volatile compound with
a) Ni
b) Cu
c) Al
d) Si

92) Silicones have the general formula
a)
b)
c)
d)

93) Tin cry is due to
a) Action of water on tin
b) Soft nature of tin
c) Crystals rubbing against each other
d) None of the above

94) The purest form of carbon among the following is
a) Anthracite
b) Coal
c) Wood charcoal
d) Graphite

95) In buckminster fullerene, each carbon atom is
a) sp-Hybridized
b)
c)
d) None of the above

96) The gas which burns with a blue flame is
a)
b) CO
c)
d)

97) Which one of the following species does not exist ?
a)
b)
c)
d)

98) When formic acid or oxalic acid is treated with conc. H2SO4 the gas evolved is
a)
b) CO
c)
d)

99) Carborundum is obtained when silica is heated at high temperature with
a) Carbon
b) Carbon monoxide
c) Carbon dioxide
d) Calcium carbonate

100) Moderate electrical conductivity is shown by
a) Silica
b) Graphite
c) Diamond
d) Carborundum


Answer

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