P – BLOCK ELEMENTS – 13

1) Which of the following is a good conductor of electricity ?
a) Antracite
b) Diamond
c) Charcoal
d) Graphite

2) Which of the following is a semiconductor ?
a) C
b) Pb
c) Ge
d) Sn

3) The inert form of carbon is
a) Diamond
b) Graphite
c) Coal
d) Charcoal

4) Synthesis gas is a mixture of
a) Steam and CO
b)
c)
d)

5) The poisonous gas present in the exhaust fumes of cars is
a)
b)
c) CO
d)

6) Graphite is a good conductor of electricity because it
a)
b) Has free electrons
c) Is crystalline
d) Has free atoms

7) Metals combine with carbon at high temperatures to form
a) Carbides
b) Carbonates
c) Hydroxides
d) Oxides

8) Silicon is an important constituent of
a) Chlorophyll
b) Haemoglobin
c) Rocks
d) Amalgams

9) Pyrex glass is a mixture of
a) Sodium borosilicate and aluminium borosilicate
b) Sodium silicate and calcium silicate
c) Sodium silicate and lead silicate
d) Sodium silicate and aluminium borosilicate

10) Water gas is an important fuel. It is a mixture of
a)
b)
c)
d)

11) Galena is an ore of
a) Gallium
b) Lead
c) Tin
d) Germanium

12) The chemical name of phosgene is
a) Phosphorus
b) Carbonyl chloride
c) Phosphorus oxychloride
d) Phosphorus trichloride

13) Which variety of glass is used for the manufacture of optical glasses?
a) Sodium glass
b) Flint glass
c) Ground glass
d) Quartz

14) The substance used as a smoke screen in warfare is
a)
b)
c)
d) Acetylene

15) Litharge (PbO) is used for all the following except
a) The manufacture of special glasses
b) Glazing pottery
c) Preparing paints
d) Lead storage batteries

16) The ability of a substance to assume two or more crystalline structures is called
a) Isomerism
b) Polymorphism
c) Isomorphism
d) Amorphism

17) When a mixture of air and steam is passed over red hot coke, the outgoing gas is
a) Producer gas
b) Water gas
c) Coal gas
d) None of these gases

18) Which of the following is not used as a pigment in paints ?
a) Lead dioxide
b) White lead
c) Lead chromate
d)

19) Which one of these is acidic ?
a)
b)
c)
d)

20) The shape of the carbon dioxide molecule is
a) Octahedral
b) Linear
c) Tetrahedral
d) Square planar

21) The chemical composition of white lead is
a)
b)
c)
d) PbO

22) The composition of the common glass is
a)
b)
c)
d)

23) Which one of the following is not the characteristic property of carbon ?
a) It exhibits catenation
b) It forms compounds with multiple bonds
c) Its melting point and boiling point are exceptionally high
d) It shows semi-metallic character

24) An example of a major air pollutant is
a)
b)
c) CO
d) He

25) The halide which is not hydrolysed is
a)
b)
c)
d)

26) Glass is a
a) Liquid
b) Solid
c) Supercooled liquid
d) Transparent organic polymer

27) The principal constituent of pyrex glass is
a) Zn
b) B
c) Pb
d) Cl

28) Glass reacts with
a) Oleum
b) HF
c)
d)

29) Identify the correct statement with respect to carbon monoxide ?
a) It combines with water to form carbonic acid
b) It reacts with haemoglobin in red blood cells
c) It is a powerful oxidising agent
d) It is used to prepare aerated drinks

30) Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of
a) Carbon monoxide and water vapour
b) Carbon monoxide
c) Nitrogen dioxide
d) Sulphur dioxide

31) Which of the following types of forces bind together the carbon atoms in diamond ?
a) Ionic
b) Covalent
c) Dipolar
d) van der Waals

32) Water gas is produced by
a) Passing steam through a red hot coke bed
b) Saturating hydrogen with moisture
c) Mixing oxygen and hydrogen in the ratio of 1 :2
d)

33) Which of the following has the highest calorific value?
a) Coal gas
b) Water gas
c) Producer gas
d) Carbon dioxide gas

34) Water glass is
a) Another name for sodium silicate
b) A specific form of glass to store water only
c) Hydrated fowl of glass
d) Hydrated silica

35) Diamond is an example of a
a) Metallic crystal
b) Covalent crystal
c) Ionic crystal
d) Molecular crystal

36) Which of the following is not a Lewis base ?
a)
b)
c)
d) CO

37) The material used in solar cells contains
a) Cs
b) Si
c) Sn
d) Ti

38) Na+, Mg2+, Al3+ and Si4+ are isoelectronic. Their ionic size will follow the order
a)
b)
c)
d)

39) White lead is
a) Basic lead acetate
b) Acidic lead carbonate
c) Basic lead carbonate
d) Basic lead hydroxide

40) The composition of glass is
a) Silica, lime, NaCI
b)
c) Silica, NaCI
d)

41) An ammoniacal solution of CuCI absorbs
a)
b)
c)
d) CO

42) PbCI4 exists but PbBr4 and Pbl4 do not, because of the
a)
b) larger size of Br and I
c) More electronegative nature of bromine and iodine
d) gaseous nature of chlorine

43) Which of the following shows the correct change in the property of elements with increase in atomic number in the carbon family (group 14)?
a) Their metallic character decreases
b) The stability of the + 2 oxidation state increases
c) Their ionization energy increases
d) Their atomic size decreases

44) Which one of the following has the maximum bond dissociation energy ?
a) O – O
b) C – C
c) N – N
d) F – F

45) White lead is
a)
b)
c)
d)

46) The oxide which cannot act as a reducing agent is
a)
b)
c)
d)

47) A solid element (symbol Y) conducts electricity and forms two chlorides YCIn (a colourless

volatile liquid) and YCIn-2(a colourless solid).To which one of the following groups of the

periodic table does Y belong ?
a) 13
b) 14
c) 15
d) 16

48) Which one of the following oxides is neutral?
a) CO
b)
c) ZnO
d)

49) The structure and hybridization of Si(CH3)4 is
a) Bent, sp
b)
c)
d)

50) @ The ion that can be precipitated by HCI as well as H2S is
a)
b)
c)
d)

51) Which of the following is most dense?
a) Fe
b) Cu
c) B
d) Pb

52) Which of the following is true for diamond ?
a) It is a good conductor of electricity
b) It is soft
c) It is a good conductor of heat
d) It is made up of C

53) In graphite, electrons are
a) Localised on every third C-atom
b) Present in an anti-bonding orbital
c) Localised on each C-atom
d) Spread out between the layers of the structure

54) Which of the following halides is the most stable ?

Bond C-F C-Cl C-Br C-l
Bond dissociation energy(kjmol-1) 485.3 339 284.5 213.3

a)
b)
c)
d)

55) Which of the following conceivable structures for CCI4 will have a zero dipole moment ?
a) Square planar
b) Square pyramid (carbon at apex)
c) Irregular tetrahedron
d) None of the above

56) Carbon forms a large number of compounds because it has a

a) Fixed valency
b) Non-metallic nature
c) High ionization potential
d) Property of catenation

57) Natural gas is
a)
b)
c)
d) None

58) Freon-12 is used as a
a) Refrigerant
b) Insecticide
c) Fungicide
d) Herbicide

59) Silica is soluble in
a) HCI
b)
c)
d) HF

60) Carbogen is a
a) pure form of carbon
b) common name for COCl2
c)
d)

61) Ge (II) compounds are powerful reducing agents whereas Pb (IV) compounds are strong oxidants. This may be due to
a) Pb being more electropositive than Ge
b) the ionization potential of lead being less than that of Ge
c)
d) a more pronounced inert pair effect In lead than in Ge

62) Which of the following is a pseudo solid?
a) Diamond
b) Glass
c) Rock salt
d)

63) C and Si have
a) the same physical properties
b) Different physical properties
c) the same physical but different chemical properties
d) Different chemical and physical properties

64) Which of the following is isoelectronic with as well as having the same structure as that of N2O ?
a)
b)
c)
d)

65) Heating oxalic acid with conc. H2SO4 evolves
a)
b)
c)
d)

66) sp-hybridization is involved in
a)
b)
c)
d)

67) CO2 is absorbed by plants in the presence of chlorophyll and sunlight to produce
a) Cellulose
b) Starch
c) Glucose
d) All the above

68) Which of the following is not suitable for use in a desiccator to dry substances ?
a)
b)
c)
d)

69) Setting of cement under water is essentially a/an
a) oxidation process
b) Reduction process
c) Double decomposition
d) Hydration process

70) The purification of aluminium by electrolytic refining is
a)
b)
c) Hoope’s process
d)

71) The metal that does not give the borax bead test is
a) Chromium
b) Nickel
c) Lead
d) Manganese

72) Among ClF3, BF3 and NH3 molecules the one with non-polar geometry is
a)
b)
c)
d) None of these

73) Which of the following compounds has zero dipole moment ?
a) Ammonia
b) Water
c) Sulphur dioxide
d) Boron trichloride

74) Anhydrous AlCl3 is prepared from
a) Conc. HCl and aluminium metal
b)
c) Dry HCl gas and heated Al metal
d) Dilute HCl and aluminium metal

75) Which metal is protected by a layer of its own oxide ?
a) Aluminium
b) Silver
c) Gold
d) Iron

76) Which metal salt gives a violet coloured bead in the borax bead test ?
a)
b)
c)
d)

77) Purification of alumina is called
a) Castner process
b) Bosch process
c)
d)

78) The type of hybridisation of boron in diborane is
a) sp
b)
c)
d)

79) AlCl3 on hydrolysis gives
a)
b)
c)
d)

80) The state of hybridisation of B in BCl3 is
a) sp
b)
c)
d)

81) Fluorine is more electronegative than boron and 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 the atomic radius of B
d)

82) Thallium shows different oxidation states because of
a) Its high reactivity
b) the inert pair of electrons
c) Its amphoteric nature
d) It is a transition metal

83) Identify the statement that is not correct for diborane.
a) There are two bridging hydrogen atoms and four terminal hydrogen atoms in diborane
b) Each boron atom forms 4 bonds in diborane
c) The hydrogen atoms are not in the same plane in diborane
d) All B-H bonds in diborane are similar

84) AlCl3 fumes in moist air because
a) It is very volatile
b) It is covalent
c) HCl is formed in moist air
d) It is highly hygroscopic

85) Which of the following statements are incorrect ?
a)
b) Ammonal is a mixture of aluminium compounds and is used in bombs
c)
d)

86) In diborane,
a) 4 bridged hydrogens and two terminal hydrogens are present
b) 2 bridged hydrogens and 4 terminal hydrogens are present
c) 3 bridged and 3 terminal hydrogens are present
d) None of these

87) AlCl3 exists as dimer because
a) Al has a great ionisation potential
b) Al has a large radius
c) of the high charge in the nucleus
d) Incomplete p-orbitals

88) Which of the following does not form the M3+ ion ?
a) Boron
b) Aluminium
c) Indium
d) Gallium

89) Boron does not form B3+ ions because
a) Boron has a small size and high ionisation energy
b) Boron has high electronegativity
c) Boron has high charge density
d) None of these

90) Although Al has a high oxidation potential it resists corrosion because of the formation of a tough protective coat of
a)
b) AlN
c)
d)

91) The inert pair effect is observed
a) When an element shows inertness in chemical combination
b) When a bond pair of electrons is present in the element
c) When the two s-electrons is present in the element
d) When the two s-electrons remain paired and do not participate in bonding

92) Which of the following oxides is strongly basic ?
a)
b)
c)
d)

93) Which of the following is not possible ?
a)
b)
c)
d)

94) B2O3 is
a) Acidic
b) Basic
c) Amphoteric
d) None

95) Among the halides of the elements of group 13, the one which is most acidic is
a)
b)
c)
d)

96) Which of the following is not known ?
a)
b)
c)
d)

97) Which is the correct order of power to accept one pair of electrons (Lewis acid character) ?
a)
b)
c)
d) None

98) Which of the following statements is wrong about BCl3 ?
a)
b)
c)
d)

99) Which of the following statements is wrong ?
a)
b)
c)
d)

100) The monovalency of the heavier members of group 13 elements can be explained on the basis of
a) Their low ionisation energies
b) Their low electronegativities
c) Their large sizes
d) the inert pair effect


Answer

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