P – BLOCK ELEMENTS – 23

1) Cl2O6 is an anhydride of
a)
b)
c)
d)

2) The acidic nature of the oxides of chlorine increases
a) As the oxidation number of chlorine decreases
b) As the oxidation number of chlorine increases
c) As the number of oxygen atoms in the oxide decreases
d) None

3) Which of the following is obtained from sea water ?
a)
b)
c)
d)

4) Which of the following hydrohalic acids is inexpensive, strong and stable against oxidation?
a) HF
b) HCl
c) HBr
d) HI

5) When K2Cr2O7 crystals are heated with conc.

HCl, the gas evolved is
a)
b)
c)
d) None

6) If Cl2 is passed into aqueous solution of KI containing some CCl4 and the mixture is shaken,
a) the upper layer becomes violet
b) a homogeneous violet layer is formed
c) an orange colour appears
d) the lower layer becomes violet

7) Which of the following has the maximum vapour pressure?
a) HI
b) HBr
c) HCl
d) HF

8) Which of the following equations indicates the common laboratory method for the preparation of chlorine?
a)
b)
c)
d)

9) Which of the following does not form any oxyacids?
a)
b)
c)
d) S

10) Which of the following properties does not apply to the order: HI < HBr < HCl < HF?
a) Thermal stability
b) Reducing power
c) Ionic character
d) dipole moment

11) The reaction of chlorine with CO in the presence of sunlight gives
a)
b)
c) HOCl
d)

12) Oxidising action increases from left to right in the following order
a) Cl < Br < I < F
b) Cl < I < Br < F
c) I < F < Cl < Br
d) I < Br < Cl < F

13) Which of the following halogens have the strongest intermolecular forces?
a)
b)
c)
d)

14) Which is most soluble in water?
a) AgCl
b) AgF
c) AgBr
d) Agl

15) In which pair can a halogen displace another halogen?
a)
b)
c)
d)

16) When I is dissolved in CCl4, the colour that results is
a) Brown
b) Violet
c) Colourless
d) Bluish green

17) Fluorine is manufactured by
a) Electrolysis of aqueous HF
b)
c)
d)

18) Fluorine exhibits only -1 oxidation state while iodine exhibits oxidation states of-1, +1, +3, +5 and +7. This is because of
a) the available d-orbitals in iodine
b) the unfilled p-orbitals
c) the reactivity of iodine
d) None of these

19) Which of the following statements is true regarding the electrolysis of molten ICl?
a) Iodine is liberated at the cathode
b) Chlorine is liberated at the cathode
c) Iodine is liberated at the anode
d) Both Iodine and Chlorine are liberated at the anode

20) HCl is a gas but HF is a low boiling liquid. This is because
a) the H-F bond is strong
b) the H-F bond is weak
c) Of hydrogen bonding in HF
d) HF is a weak acid

21) The shape of the IF5 molecule is
a) Pentagonal planar
b) Trigonal pyramidal
c) Square pyramidal
d) Octahedron

22) Which is the correct order of increasing radii?
a) F < O < C < Cl < Br
b) F < C < O < Cl < Br
c) F < Cl < Br < C < O
d) F < Cl < Br < O < C

23) Which of the following cannot be kept in glass bottles because it chemically reacts with glass ?
a) HF
b) HI
c) HBr
d) HCl

24) Bleaching powder loses its available chlorine on standing because
a) It changes into calcium hypochlorite and calcium carbonate
b) It changes into calcium bicarbonate and chlorine
c) It changes into calcium chlorate and calcium chloride
d) It changes into calcium chlorate and calcium carbonate

25) The type of hybrid orbitals used by chlorine atom in CIO2 ion
a)
b)
c) sp
d) None

26) The order HF < HCl < HBr < HI is correct in the case of
a) Bond length
b) Thermal stability
c) Ionic character
d) Dipole moment

27) In halogens the covalent bond is always
a) pi bonding
b) sigma bonding
c) sigma-pi bonding
d) None of these

28) Fluorine is highly reactive. This is due to the
a) Weaker F-F bond
b) Strong oxidising property of fluorine
c) High electronegativity of fluorine
d) All are correct

29) Which among the following is an essential trace element involved in the physiology of the thyroid glands ?
a) Fe
b) Ca
c) Na
d)

30) Iodine is a solid at room temperature because of the
a) Low value of electronegativity
b) Large size
c) Large magnitude of vander Waals forces
d) Availability of orbitals

31) The maximum ionisation energy is of
a)
b)
c)
d)

32) Interhalogen compounds are more reactive than the individual halogen because
a) Two halogens are present in place of one
b) They are more ionic
c) Their bond energy is less than the bond energy of the halogen molecule
d) They carry more energy

33) Bleaching powder reacts with water to give
a) HCl, HClO
b) HClO
c) HCl
d)

34) Iodine can form the ions
a)
b)
c)
d) All

35) Which forms an acid salt?
a) HF
b) HCl
c) HI
d) HBr

36) Which of the following interhalogen compounds are square planar ?
a)
b)
c)
d) All are correct

37) The volatile nature of the halogens is because
a) Halogen molecules are bound by strong forces
b) Halogen molecules are bound by electrostatic forces
c) The forces existing between discrete molecules are weak vander Waals forces
d) The halogen molecules are more reactive

38) Which of the following are freons?
a)
b)
c)
d) All

39) Which of the following are a strong oxidising agent and a strong reducing agent, respectively?
a)
b)
c)
d)

40) The formula of iodine phosphate is
a)
b)
c)
d)

41) The most stable oxyacid of chlorine is
a) HClO
b)
c)
d)

42) The solubility of I2 increases in water in presence of
a) KI
b)
c)
d)

43) Iodine is placed between two liquids C6H6 and water. Which of the following is true?
a)
b) It dissolves more in water
c) It dissolves equally in both
d) Does not dissolves in both

44) In the preparation of Cl2 from HCl and MnO2, the latter acts as a/an
a) Oxidising agent
b) Reducing agent
c) Catalytic agent
d) Dehydrating agent

45) When an excess of Cl2 reacts with NH3, the products formed are
a)
b)
c)
d)

46) HF is not stored in glass bottles because
a) It reacts with visible light
b)
c)
d)

47) Which element is extracted commercially by the electrolysis of an aqueous solution of one of its compounds?
a) Na
b) Al
c)
d)

48) Which of the following acids can combine with its own salt again?
a) HF
b) HBr
c) HCl
d) HI

49) Deacons process is used in the manufacture of
a) Bleaching powder
b) Sulphuric acid
c) Nitric acid
d) Chlorine

50) HIO3 on heating gives
a)
b)
c)
d) All

51) The formula of freon is
a)
b)
c)
d) None of these

52) When bleaching powder is treated with CO2
a) HCl is evolved
b)
c)
d)

53) Which of the following liberates Br2 from KBr solution?
a) HI
b)
c)

d) (b) and (c)

54) Which of the following has the highest percentage of ionic character?
a) HI
b) HBr
c) HCl
d) HF

55) Pure Cl2 is prepared by heating
a) NaCl
b)
c)
d) All

56) Among the following ions, the one that cannot undergo disproportionation is
a)
b)
c)
d)

57) During bleaching with chlorine, an antichlor is employed to
a) Enhance the bleaching action
b) Eliminate the last traces of the bleaching agent
c) Remove grease from the fibre
d) Liberate oxygen

58) The non-metal other than graphite which has a metallic lustre is
a)
b) Si
c)
d)

59) Weldon mud is
a)
b)
c)
d)

60) Which of the following halogens does not form polyhalide ions?
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

61) Which of the following form inter-halogen compounds?
a) F
b) Cl
c) Br
d) All the above

62) Which of the following inter-halogen compounds does not exist?
a)
b)
c) ICI
d)

63) Which of the following fluorides will combine further with fluorine?
a)
b) NaF
c)
d)

64) The oxide containing the highest oxidation state of halogen is
a)
b)
c)
d)

65) Which of the following statements is correct regarding electrolysis of molten ICI?
a)
b)
c)
d)

66) Which of the following is the strongest acid?
a)
b)
c)
d) All are equally strong

67) Which one of the following oxides of halogens has a linear structure?
a)
b)
c)
d) None

68) CI2O7 can be regarded as an anhydride of
a) Hypochlorous acid
b) Chlorous acid
c) Chloric acid
d) Perchloric acid

69) Of the sodium halides, NaF has the highest melting point because
a) Fluorine has the highest electronegativity
b) Fluorine has higher ionization energy than any other halogens
c) NaF has the maximum ionic character
d) NaF has the minimum ionic character

70) Bromine is added to cold dilute aqueous solution of NaOH. The mixture is boiled. Which of the following statements is not true?
a) During the reaction Br is present in four different oxidation states
b) The greatest difference between the various oxidation states of
Br is 5

c) On acidification of the final mixture bromine is formed
d) Disproportionation of bromine occurs during the reaction

71) From the trends observed in the halogen family, the element astatine should possess which of the
following properties ?

a) Smallest size
b) Lowest electronegativity
c) Highest ionization potential
d) Lower melting point

72) Which of the following is not paramagnetic?
a)
b)
c)
d)

73) Iodine reacts with hot conc. NaOH to give
a)
b)
c)
d)

74) Bromine reacts with cold NaOH to give
a)
b)
c)
d)

75) Which of the following is used as an antichlor in bleaching?
a) Sodium sulphide
b) Sodium thiosulphate
c) Sodium sulphate
d) Sodium carbonate

76) Which of the following is known as a super halogen?
a) Chlorine
b) Bromine
c) Fluorine
d) Iodine

77) The halogen forming the largest number of interhalogens is
a) F
b) Cl
c) Br
d) I

78) The most basic halogen is
a) F
b) Cl
c) Br
d) I

79) the halogen which shows metallic character is
a) F
b) Cl
c) Br
d) I

80) The correct order of increasing conjugate base strength is
a)
b)
c)
d)

81) The most electronegative element in the periodic table is
a) F
b) O
c) N
d) Cl

82) Pick out the correct statement from the following:
a) The electron affinity of fluorine is greater than that of bromine
b) The bond dissociation energy of Iodine is greater than that of fluorine
c) Bromine is a volatile solid
d) As the excitation energy decreases from Flourine to Iodine, the colour of the halogen deepens in that order

83) The colour of iodine solution in water (due to its very little solubility) is
a) Violet
b) Yellow
c) Brown
d) Red

84) Chlorine is mixed with drinking water so that
a) Bacteria are killed
b) Dirt is removed
c) Water is cleaned
d) Suspension is removed

85) The bleaching action of chlorine is due to the formation of
a) HCl
b) HCIO
c)
d)

86) Among the following the element present in teflon is
a) Fluorine
b) Chlorine
c) Oxygen
d) Nitrogen

87) Which of the following is an azo dye?
a) Congo red
b) Malachite green
c) Martius yellow
d) Indigo

88) Which of the following is a basic dye ?
a) Alizarine
b) Aniline yellow
c) Orange –1
d) Martius yellow

89) Polystyrene belongs to the category of
a) Thermoplastic
b) Thermosetting plastic
c) Cold setting plastic
d) All of these

90) Vulcanisation of rubber is carried out in order to
a) Increase the strength of rubber and make it less brittle
b) Increase the weight of the polymer
c) Prevent the oxidation of rubber
d) All of these

91) Vinyl acetate is mostly used in
a) Latex paints
b) Plastic coatings
c) Plastic rubber wires
d) None of these

92) The common synthetic detergents are
a) Alkyl benzene sulphonates (ABS)
b) Sodium lauryl sulphate
c) Cationic detergents or invert soap
d) All of these

93) The compounds used to fix the dyes to the fibre are known as
a) Mordants
b) Azeotropes
c) Bleaching agents
d) Thinners

94) P.V.C. is formed by polymerisation of
a) 1-Chloroethene
b) Ethene
c) Propene
d) 1 -Chloropropane

95) Dimethyl phthalate and ethylene glycol react to form Â
a) Nylon-6
b) Nylon-66
c) Dacron
d) Neoprene

96) Which is not a macromolecule?
a) DNA
b) Starch
c) Palmitate
d) Insulin

97) Which one of the following is not an example of a chain growth polymer ?
a) Neoprene
b) Buna-S
c) PMMA
d) Glyptal

98) Ziegler-Natta catalyst is
a)
b)
c)
d)

99) Nylon-66 is made by using
a) Phenol
b) Benzaldehyde
c) Adipic acid
d) Adipic acid

100) On the basis of mode of formation, polymers can be classified in which of the following ways? Â
a) as addition polymers only
b) as condensation polymers only
c) as copolymers
d) Both as addition and condensation polymers


Answer

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