P – BLOCK ELEMENTS – 25

1) Chlorous acid and its salts (chlorites) are
a) Good oxidising agents
b) Good reducing agents
c) Good bleaching agents
d) Good oxidising and bleaching agents

2) Which of the following oxyanions of chlorine is most stable?
a)
b)
c)
d)

3) By the action of conc. HCl on potassium chlorate we get
a)
b)
c)
d)

4) The bond angle in Cl2O is
a)
b)
c)
d)

5) Which of the following has sp3 hybridisation?
a)
b)
c)
d) All are correct

6) Treatment of CS2 with excess of chlorine gives
a)
b)
c) Carbon black
d)

7) Uranium isotopes are usually separated by using compounds of the halogen
a)
b)
c)
d)

8) In the manufacture of bromine from sea water the mother liquor containing bromides is treated with
a)
b)
c)
d)

9) Which of the following is known as Javelle water?
a) NaCl
b)
c)
d) NaOCl

10) HF present as an impurity in gaseous F2 can be removed by passing the gas over
a)
b) NaF
c)
d)

11) Which of the following is a diamagnetic oxide of chlorine?
a)
b)
c)
d) None

12) Which of the following elements has the highest electronegativity?
a) Chlorine
b) Fluorine
c) Oxygen
d) Nitrogen

13) Which of the following sets of elements is known as halogens?
a) Li, Na, K
b) F, Cl, Br
c) He, Ne, Ar
d) Cu, Ag, Au

14) The electronic configuration of four elements A, B, C and D are

A=1s2

B = 1s22s22p2

C=1s22s22p5

D = 1s22s22p6.

The tendency to form electrovalent bond is largest in
a) D
b) C
c) B
d) A

15) The nucleus of an element contains 9 protons. Its valency would be
a) 1
b) 2
c) 3
d) 5

16) The halogen with the highest value of ionization energy is
a) F
b) Cl
c) Br
d) I

17) Which of the following has the highest electronegativity?
a) Iodine
b) Bromine
c) Chlorine
d) Fluorine

18) The order of electron affinity of halogens is
a) F > Cl > Br > I
b) Cl > Br > F > I
c) Cl > F > Br > I
d) I > Br > Cl > F

19) Which of the following shows the greatest inert pair effect?
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

20) Which of the following halogens exists in the solid state?
a)
b)
c)
d)

21) At ordinary temperature and pressure, chlorine is a gas, bromine is a liquid and iodine is a solid. This is because
a) Of these three, chlorine is the lightest and iodine is the heaviest
b) Chlorine has the lowest specific heat
c) Chlorine molecule is the least stable
d) Intermolecular forces are weakest in chlorine and strongest in iodine

22) Halogen molecules are
a)
b)
c)
d)

23) Which of the following halogens has the highest melting point?
a)
b)
c)
d)

24) A substance that sublimes readily is
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

25) The greater reactivity of F2 is due to its
a) Low F—F bond energy
b) Small size
c) High heat of hydration
d) All of the above

26) HI cannot be prepared by the action of conc. H2SO4 on Kl because
a)
b)
c) HI is a strong reducing agent
d) Both (b) and (c)

27) Which of the following halogens has the highest bond dissociation energy?
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

28) The halogen-halogen bond length is longest for
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

29) Fluorine does not show variable oxidation states due to
a) Its high electronegativity
b) the small size of its atoms
c) its low bond dissociation energy
d) the non availability of d-orbitals

30) Which of the following is the strongest reducing agent?
a)
b)
c)
d)

31) The lowest value ie, 0.53 V, for the electrode potential (E°) for the reaction

X2 (solution) + 2 e = 2X(aq) may be assigned to
a)
b)
c)
d)

32) Which element would readily replace oxygen from an oxide?
a) Fluorine
b) Chlorine
c) Nitrogen
d) Sulphur

33) The correct order of increasing bond length of F2, N2, CI2 and O2 is
a)
b)
c)
d)

34) Among the following, the one which is capable of existence is
a)
b)
c)
d)

35) Which of the following has the highest value of dipole moment?
a) HF
b) HCI
c) HBr
d) HI

36) Which of the following has the longest bond length?
a) HF
b) HCI
c) HBr
d) HI

37) Which of the following compounds has the lowest boiling point?
a) HF
b) HCI
c) HBr
d) HI

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

39) Of the hydrogen halides, the most thermally stable is
a) HF
b) HCI
c) HBr
d) HI

40) Which of the following does not form a precipitate with AgNO3?
a) HF
b) HCI
c) HBr
d) HI

41) Fluorine is more reactive than chlorine because
a) the F—F bond is weaker than the Cl—Cl bond
b) Fluorine does not have d-orbitals
c) Fluorine has high ionization energy
d) the electron affinity of fluorine is less than that of chlorine

42) Which of the following has the maximum vapour pressure?
a) HCI
b) HBr
c) HI
d)

43) Which of the hydrogen halides is a liquid?
a) HF
b) HCI
c) HBr
d) HI

44) Iodine dissolves in potassium iodide solution due to the formation of
a)
b)
c)
d)

45) Which of the following oxyacids of chlorine is the best oxidising agent?
a) HOCI
b)
c)
d)

46) The acid employed for etching of glass is
a)
b)
c) HF
d) Aqua regia

47) The strongest reducing agent amongst the following is
a)
b)
c) Bromine
d) Chlorine

48) Which is the best reducing agent?
a)
b)
c)
d)

49) Which of the following halides is not oxidized by MnO2?
a)
b)
c)
d)

50) Iodine is liberated when chlorine is passed through an acidified solution of potassium iodide because
a) Chlorine is a more powerful reducing agent than iodine
b) Chlorine is a more powerful oxidising agent than iodine
c) Chlorine is more electronegative than iodine
d) Chlorine is less electronegative than iodine

51) One gas bleaches the colours of flowers by reduction and the other by oxidation. The two gases are respectively
a)
b)
c)
d)

52) Iodine is formed when Kl reacts with a solution of
a)
b)
c)
d)

53) Iodine may be determined quantitatively by titrating it with a standard solution of
a)
b)
c)
d)

54) Bromine vapours will turn moist starch iodide paper
a) Brown
b) Red
c) Blue
d) Colourless

55) Chlorine gas can be dried by passing over
a) Quick lime
b) Soda lime
c) Caustic potash
d)

56) Chlorine is formed when dil. HCI is treated with
a)
b)
c)
d) None

57) Bromine is formed when conc. HBr is heated with
a)
b)
c)
d) All

58) Sea weeds are an important source of
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

59) Fluorine is not prepared by general methods because
a) HF can be easily oxidised
b) HF cannot be easily oxidised
c) HF is highly poisonous
d) HF is a good conductor of electricity

60) The manufacture of fluorine is carried out by
a) Electrolysis of aqueous HF
b)
c)
d)

61) Fluorine reacts with dil. NaOH solution to give
a) Sodium fluoride and oxygen
b) Sodium fluoride and oxygen difluoride
c) Sodium fluoride and ozone
d) Fluoride, oxygen and ozone

62) Which of the following will result in the oxidation of the halide ion?
a)
b)
c)
d)

63) A substance X when heated with conc. H2SO4 liberates a gas which turns starch paper blue.The substance X is
a) Nal
b) NaBr
c) NaCI
d)

64) Which of the following colours does bromine give when it reacts with starch paper ?
a) Yellow
b) Brown
c) Blue
d) Red

65) The lowest value of heat of hydration is shown by
a)
b)
c)
d)

66) Which one of the following is the most basic?
a) I
b) Br
c) CI
d) F

67) Mark the strongest acid:
a) HF
b) HCI
c) HBr
d) HI

68) Which of the following halogens has the greatest electron affinity?
a) I
b) Cl
c) F `
d) Br

69) Which of the following will have the largest size?
a) Br
b) F
c) l
d)

70) The colour of iodine solution is discharged by shaking it with an aqueous solution of
a)
b) Sodium sulphide
c) Sodium thiosulphate
d) Sodium sulphate

71) Mark the element which displaces three halogens from their compounds:
a) F
b) Cl
c) Br
d) I

72) Which of the following is most stable to heat?
a) HCI
b) HOCI
c) HOCI
d) HI

73) On boiling an aqueous solution of KCIO3 with iodine which of the following products is obtained?
a)
b)
c)
d) KCI

74) Chlorine gas is dried over
a) CaO
b) NaOH
c) KOH
d)

75) Which of the following is a pseudohalide?
a)
b) ICI
c)
d)

76) HBr and HI can reduce sulphuric acid; HCI can reduce KMnO4 and HF can reduce
a)
b)
c)
d) None of the above

77) Sodium chloride when heated with conc. H2SO4 and solid potassium dichromate gives
a) Chromic chloride
b) Chromyl chloride
c) Chromous chloride
d) None

78) Iodine can exist in the oxidation states
a) -1,1, 3, 5
b) -1,1,3
c) 3,5,7
d) -1,1,3,7

79) Sea weeds are an important source of
a) Iron
b) Chlorine
c) Iodine
d) Bromine

80) Which is the most volatile compound?
a) HI
b) HCI
c) HBr
d) HF

81) Which one is the anhydride of HCIO4?
a)
b)
c)
d)

82) Chlorine acts as a bleaching agent only in presence of
a) Dry air
b) Moisture
c) Sunlight
d) Pure oxygen

83) Which of the following halogens does not form an oxyacid?
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

84) Mark the smallest atom
a) F
b) Cl
c) Br
d) I

85) HI cannot be prepared by the action of conc. H2SO4 on Kl because
a)
b)
c)
d)

86) Mark the strongest reducing agent:
a)
b) HCI
c) HBr
d) HI

87) Bromine is obtained on a commercial scale from
a) Caliche
b) Carnallite
c) Common salt
d) Cryolite

88) Iodine deficiency in diet is known to cause
a) Beriberi
b) Goitre
c) Rickets
d) Night blindness

89) Which one of the following halogen acids is a liquid?
a) HF
b) HCI
c) HBr
d) HI

90) Which of the following acids is weakest?
a) HCIO
b) HBr
c)
d) HCI

91) Hydrogen bonding is strongest in
a) O—H……S
b) S—H……O
c) F—H……F
d) F—H……O

92) In which of the following does oxygen have the + 2 oxidation number?
a)
b)
c)
d)

93) Fluorine does not show positive oxidation states due to the absence of
a) d-orbitals
b) s-orbitals
c) p-orbitals
d) None

94) Bromine can be liberated from potassium bromide solution by the action of
a) Iodine solution
b) Chlorine water
c) Sodium chloride
d) Potassium iodide

95) A certain gas reacts with CaO but not with NaHCO3. The gas is
a)
b)
c)
d)

96) The outermost electronic configuration of the most electronegative element is
a)
b)
c)
d)

97) Which of the following belongs to the halogen family?
a) Francium
b) Polonium
c) Radium
d) Astatine

98) The correct increasing order of bond dissociation energy for N2,O2,F2,Cl2 is
a)
b)
c)
d)

99) Which of the following has the greatest reducing power?
a) HI
b) HBr
c) HCI
d) HF

100) Which of the following is a bad conductor of electricity ?
a)
b) HCI
c) HBr
d) HI


Answer

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