P – BLOCK ELEMENTS – 26

1) Bleaching powder is obtained by the action of chlorine gas on
a)
b)
c) Dry CaO
d) Dry slaked lime

2) Mark the element which shows only one oxidation state:
a) F
b) Cl
c) Br
d) I

3) Which of the following halogens has the highest bond energy?
a)
b)
c)
d)

4) Which halogen is most electropositive?
a) F
b) Cl
c) Br
d) I

5) Euchlorine is a mixture of
a)
b)
c)
d) None of these

6) Which one of the following is the true covalent oxide of iodine?
a)
b)
c)
d)

7) Conc. HNO3 reacts with iodine to give
a) HI
b) HOI
c)
d)

8) Which of the following is the strongest acid?
a)
b)
c)
d)

9) Fluorine is a stronger oxidizing agent than chlorine in aqueous solution. This is attributed to many factors except
a) Heat of dissociation
b) Electron affinity
c) Ionization potential
d) Heat of hydration

10) Bleaching powder reacts with a few drops of conc. HCI to give
a) Chlorine
b) Hypochlorous acid
c) Calcium oxide
d) Oxygen

11) Iodine readily dissolves in potassium iodide solution giving
a)
b)
c)
d)

12) Which of the following halogen oxides is ionic?
a)
b)
c)
d)

13) Which amongst the following reactions cannot be used for the preparation of a halogen acid?
a)
b)
c)
d)

14) Which of the following hydrogen halides has the highest boiling point?
a) HF
b) HCI
c) HBr
d) HI

15) Which member of the halogen family (X2) does not show a positive oxidation state (X2+)?
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

16) Hydrogen fluoride is a liquid unlike other hydrogen halides because
a) the fluorine atom is smaller in size
b) HF is the weakest acid
c) Fluorine is highly reactive
d) HF molecules form intermolecular H-bonds

17) Which of the following is a false statement?
a) Halogens are strong oxidizing agents
b) Halogens show only – 1 oxidation state
c) HF molecules form intermolecular hydrogen bonding
d) Fluorine is highly reactive

18) Which of the following arrangements for the three halogens Cl, Br and I when placed in the order
of their increasing electron affinity is correct ?

a) Cl, Br, I
b) I, Br, Cl
c) Br, Cl, I
d) I, Cl, Br

19) The oxidising action of the halogens increases in the following order:
a) C l < Br < I < F
b) C l < I < Br < F
c) I < F < Cl < Br
d) I < Br < Cl < F

20) Which of the following halogens has metallic character?
a)
b)
c)
d)

21) The element(s) which exist/s in the liquid state is/are
a) Bromine
b) Mercury
c) Gallium
d) All

22) The bleaching action of chlorine is due to
a) Reduction
b) Hydrogenation
c) Chlorination
d) Oxidation

23) The correct increasing order of ionic size of N3-, Na+, F, O2- and Mg2+ is
a)
b)
c)
d)

24) As the atomic number of the halogens increases, the halogens
a) Lose the outermost electrons less readily
b) Become lighter in colour
c) Become less denser
d) Gain electrons less readily

25) Which statement is correct about halogens?
a) They are all diatomic and form univalent ions
b) They are all capable of exhibiting several oxidation states
c) They are all diatomic and form divalent ions
d) They can mutually displace each other from the solution of their compounds

26) Which has the highest molar heat of vaporization?
a) HF
b) HCl
c) HBr
d) HI

27) Which one of the following reacts with glass?
a)
b) HF
c)
d)

28) The type of bonding in the HCI molecule is
a) Pure covalent
b) Polar covalent
c) Highly polar
d) H-bonding

29) Which of the following bonds will be most polar?
a) N—Cl
b) O—F
c) N—F
d) N—N

30) Elements of which of the following groups will form anions most readily?
a) Oxygen family
b) Nitrogen family
c) Halogens
d) Alkali metals

31) Strongest hydrogen bonding is shown by
a) Water
b) Ammonia
c) Hydrogen fluoride
d) Hydrogen sulphide

32) The halogen, which is most easily reduced, is
a)
b)
c)
d)

33) When chlorine is passed over dry slaked lime at room temperature, the main reaction product is
a)
b)
c)
d)

34) In the manufacture of bromine from sea water, the mother liquor containing bromides is treated with
a) Carbon dioxide
b) Chlorine
c) Iodine
d) Sulphur dioxide

35) RRR Which one of the following can be purified by sublimation?
a)
b)
c)
d)

36) On oxidation with iodine, the sulphite ion is transformed to
a)
b)
c)
d)

37) The type of hybrid orbitals present in ClO2 is
a)
b)
c) sp
d) None of these

38) Fluorine is a better oxidizing agent than Br2. It is due to
a) the small size of fluorine
b) the higher electron repulsion in fluorine
c) the higher electronegativity of fluorine
d) the non metallic nature of fluorine

39) When cold NaOH reacts with CI2 which of the following is formed?
a) NaCIO
b)
c)
d) None

40) Hydrogen bonding does not play any role in the boiling of
a)
b)
c) HI
d)

41) Which of the following species has four lone pairs of electrons?
a) I
b)
c)
d) He

42) Amongst NO, AsO, CO, CIO , SO and BO the non polar species are
a)
b)
c)
d)

43) Which of the following sets has the strongest tendency to form anions?
a) Ga, In, Tl
b) Na, Mg, Al
c) N, O, F
d) V, Cr, Mn

44) @ Which one of the following sequences represents the correct increasing order of bond angles in the given molecules?
a)
b)
c)
d)

45) The correct sequence of arrangement of the following compounds in order of decreasing oxidation numbers of iodine is
a)
b)
c)
d)

46) Which of the following represent the correct order of increasing p Ka values of the given acids?
a)
b)
c)
d)

47) The charge distribution in iodine monochloride is best represented as
a)
b)
c)
d)

48) A solution of potassium bromide is treated with each of the following. Which one would liberate bromine?
a) Hydrogen iodide
b) Sulphur dioxide
c) Chlorine
d) Iodine

49) Which of the following elements is extracted commercially by the electrolysis of an aqueous
solution of its compound ?

a) Cl
b) Br
c) AI
d) Na

50) Arrange the acids (I) H2SO3, (II) H3PO3 and (III) HCIO3 in the decreasing order of acidity.
a) I > III > II
b) I > II > III
c) III > II > I
d) II > III > I

51) Which one of the following are prepared by the electrolytic method?
I. Mg II. Sn III. S IV. F2

a) I and II
b) II and IV
c) III and IV
d) I and IV

52) Which of the following pairs is not correctly matched?
a) A halogen which is liquid at room temperature — Bromine
b) The most electronegative element — Fluorine
c) The most reactive halogen— Fluorine
d) The strongest oxidizing halogen — Iodine

53) The element which liberates O2 from water is
a) P
b) N
c) F
d) I

54) When I2 is dissolved in CCI4 the colour that results is
a) Brown
b) Violet
c) Colourless
d) Bluish green

55) Ozonised oxygen can be obtained from H2O by the action of
a)
b)
c)
d)

56) The halogen which can be prepared from caliche is
a)
b)
c)
d)

57) Which one of the following is the most basic?
a)
b)
c)
d)

58) Which one of the following elements can have both positive and negative oxidation state?
a) F
b) I
c) Li
d) He

59) HI can be prepared by all the following methods, except
a)
b)
c)
d)

60) Which among the following is paramagnetic?
a)
b)
c)
d)

61) Which of the following pairs will give chlorine gas most quickly upon reaction?
a)
b)
c)
d)

62) Which one of the following oxyacids of chlorine is the least oxidizing in nature?
a) HOCI
b)
c)
d)

63) Which of the following bonds is the strongest?
a) F—F
b) Cl—Cl
c) I—I
d) Br—Br

64) Which one of the following oxides of chlorine is obtained by passing dry chlorine over silver
chlorate at 90°C ?

a)
b)
c)
d)

65) The solubility of iodine in water may be increased by adding
a) Potassium iodide
b) Chloroform
c) Carbon disulphide
d) Sodium thiosulphate

66) Which of the following salts in 1.0 M solution is most basic?
a) NaCIO
b)
c)
d)

67) The element which never acts as a reducing agent in a chemical reaction is
a) O
b) Li
c) F
d) C

68) Which is the weakest among HF, HCI, HBr and HI?
a) HF
b) HCl
c) HBr
d) HI

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

70) In the reaction 3Br2+6CO+3H2O® 5Br +BrO+6HCO
a) Bromine is oxidized and carbonate is reduced
b) Bromine is both oxidized and reduced
c) Bromine is reduced and water is oxidized
d) Bromine is neither oxidized nor reduced

71) Hydrochloric acid at 25°C is
a) Ionic and liquid
b) Covalent and liquid
c) Ionic and gas
d) None of the above

72) In the reaction HNO3 + HF ® H2NO3+ + F, the base is
a) HF
b)
c)
d) None

73) The oxidation of thiosulphate with iodine gives the
a) Sulphate ion
b) Sulphite ion
c) Tetrathionate ion
d) Sulphide ion

74) Which of the following represents calcium chlorite?
a)
b)
c)
d)

75) The shape of the molecule is
a) Triangular pyramidal
b) Tetrahedral
c) Triangular Planar
d) Triangular bi-pyramidal

76) Chlorine cannot displace
a) Fluorine from NaF
b) Iodine from Nal
c) Bromine from NaBr
d) None of the above

77) Which of the following cannot work as an oxidizing agent?
a)
b)
c)
d)

78) Among F, Cl, Br and I the lowest ionization potential will be of
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

79) The electron affinity of the halogens follows the order
a) F > Cl > Br > I
b) F < Cl < Br < I
c) F < Cl > Br > I
d) F < Cl < Br > I

80) The electronegativity follows the order
a) F > O > Cl > Br
b) F > Cl > Br > O
c) O > F > Cl > Br
d) Cl > F > O > Br

81) The bond energies of F2, CI2, Br2 and I2 are 155, 244, 193 and 151 kJ mol-1 respectively. The weakest bond will be in
a)
b)
c)
d)

82) The following acids have been arranged below. Identify the
correct order of decreasing acid strength.
CIOH (I) BrOH (II) IOH (III)

a) I > II > III
b) II > I > III
c) lll> II > I
d) l > lll> II

83) KF combines with HF to form KHF2. The compound contains the species:
a)
b)
c)
d)

84) Which one of the following species is not a pseudohalide?
a)
b)
c)
d)

85) The outer electronic structure is possessed by
a) O
b) Cl
c) Br
d) Ar

86) Which of the following is the strongest acid?
a) HOCI
b)
c)
d) HOCIO

87) The one with the largest size is
a) Cl
b)
c)
d)

88) The aqueous solution of which of the following has maximum pH?
a) NaCIO
b)
c)
d)

89) Unlike other halogens, fluorine does not show higher oxidation states because
a) It is highly electronegative
b) It has no d-orbitals
c) Its atomic radius is very small
d) The fluorine ion is stable and isoelectronic with neon

90) The geometry of according to the valence shell electron pair repulsion (VSEPR) theory will be
a) Planar triangle
b) Pyramidal
c) Tetrahedral
d) Square planar

91) The correct order of reactivity of halogens with alkalies is
a) F > Cl > Br > I
b) F < Cl > Br < I
c) F < Cl < Br < I
d) F < Cl < Br > I

92) Chlorine acts as a bleaching agent only in the presence of
a) Dry air
b) Moisture
c) Sun light
d) None of these

93) When chlorine reacts with cold and dilute solution of sodium hydroxide, the products obtained are
a)
b)
c)
d)

94) The oxidation state of chlorine in hypochlorous acid is
a) + 1
b) + 2
c) -1
d) -2

95) In the reaction 2 Br + X2 ® Br2 + 2 X, X2 is
a)
b)
c)
d)

96) Chlorine is liberated when we heat
a)
b)
c)
d)

97) Which of the following is not the characteristic of interhalogen compounds?
a) They are more reactive than halogens
b) They are quite unstable but none of them is explosive
c) They are covalent in nature
d) They have low boiling points and are highly volatile

98) Which of the following is correct about the reaction?
heat
3 NaCIO ® NaCIO3 + 2 NaCI

a) It is a disproportionation reaction
b) The oxidation number of Cl decreases as well as increases in this reaction
c) This reaction is used for the manufacture of halates
d) A!l of the above

99) Which of the following is used in the preparation of chlorine?
a)
b)
c)
d)

100) Which bond is most polar?
a) Cl—F
b) Br—F
c) l—F
d) F-F


Answer

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