P – BLOCK ELEMENTS – 22

1) The van der Waals forces in halogens increase in the order
a)
b)
c)
d)

2) Bleaching powder is
a)
b) CaCIO
c)
d)

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

4) Euchlorine is a mixture of
a)
b)
c)
d) None

5) When iodine reacts with NaF, NaBr and NaCl
a)
b) It gives chlorine
c) It gives bromine
d) None of these occur

6) Which of the following has the highest electron affinity?
a)
b)
c)
d)

7) Which one of the following exists as an associated liquid, is the poorest reducing agent and is the weakest acid?
a) HF
b) HCl
c) HBr
d) HI

8) Which of the following halogens is the strongest oxidising agent?
a)
b)
c)
d)

9) Br is converted into Br2 by using
a) HBr
b)
c)
d) Conc. HCl

10) Which of the following halogens can replace others?
a)
b)
c)
d)

11) Which is incorrect in the case of bleaching powder?
a) Highly soluble in water
b) Light yellow coloured powder
c) Oxidising agent
d)

12) The bond energies of F2, Cl2, Br2 and I2 are 155, 244, 193 and 151 kJ mole. The weakest bond is
a)
b)
c)
d)

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

14) No precipitate is formed when AgN03 solution is added to the salt solution of
a) NaF
b) NaCl
c) NaBr
d) Nal

15) Chlorine cannot be used
a) As a bleaching agent
b) In sterilisation
c) In the preparation of disinfectant
d) For extraction of Ag and Cu

16) Which forms the maximum number of compounds with xenon?
a) F
b) Cl
c) Br
d) I

17) Tincture of iodine is
a)
b)
c) KI and rectified spirit
d)

18) Bleaching powder is a
a) Normal salt
b) Mixed salt
c) Double salt
d) Complex salt

19) The most stable oxide of chlorine is
a)
b)
c)
d)

20) The strength of the halogen acids, HF, HCl, HBr and HI varies in the order
a) HF >HCl>HBr>HI
b) HF >HBr>HI>HCl
c) HBr>HI>HCl>HF
d) HI>HBr>HCl>HF

21) Bond length is maximum in
a) HI
b) HBr
c) HCl
d) HF

22) The colour of iodine solution is discharged by shaking it with an aqueous solution of
a)
b)
c)
d)

23) Sodium chloride when heated with conc.H2SO4 and solid K2Cr2O7 gives
a) Chromic chloride
b) Chromyl chloride
c) Chromous chloride
d) None

24) An element of group VII which does not show an oxidation state equal to the group number is
a) F
b) Cl
c) Br
d) I

25) HBr and HI reduce H2S04, HCl can reduce KMnO4 and HF can reduce
a)
b)
c)
d) None of these

26) All the halogens show odd oxidation states of +1, +3, +5, +7 except
a) F
b) Cl
c) Br
d) I

27) Which among the following acids is the strongest?
a) HCl
b) HBr
c) HI
d) HF

28) Which of the following is correct about the reaction, 3NaClO NaClO3 + 2NaCl ?
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) All of these

29) Fluorine does not form oxy – acids because
a) It is the most electronegative
b) It is the most powerful oxidising agent
c) It lacks d-orbitals
d) None of these

30) Which one below is a pseudo halide?
a)
b)
c)
d)

31) Fluorine is a powerful oxidising agent because of its
a) High electron affinity
b) High heat of dissociation and low heat of hydration
c) High heat of hydration and low heat of dissociation
d) High heat of hydration and high heat of dissociation

32) Fluorine is highly reactive. This is due to the
a) Low bond energy of F-F bond
b) High bond energy of F-F bond
c) gaseous nature of F2 at room temperature
d) None of these

33) Which of the following is liquid?
a) HF
b) HCl
c) HBr
d) None

34) Which of the following statements is false ?
a) Halogens are strong oxidising agents
b) Halogens show only one oxidation state of -1
c) HF molecules form intermolecular hydrogen bonding
d)

35) The reaction of sodium thiosulphate with I2 gives
a) Sodium sulphide
b) Sodium sulphite
c) Sodium sulphate
d) Sodium tetrathionate

36) The least stable oxide of chlorine is
a)
b)
c)
d)

37) The interatomic distance in H2 and Cl2 molecules are 74 and 198 pm, respectively. The bond length of HCl is
a) 272 pm
b) 136 pm
c) 124 pm
d) 248 pm

38) Fluorine gas is stored in
a) Copper vessels
b) Steel vessels
c) Both a and b
d) None

39) Which is the correct order of decreasing boiling point of azeotropic mixtures HX- H2O?
a) HI, HBr, HF, HCl
b) HI, HCl, HBr, HF
c) HF, HCl, HBr, HI
d) HCl, HF, HBr, HI

40) In an azeotropic mixture of HCl and H2O, the percentage of HCl is
a) 20.2%
b) 11.1%
c) 44.4%
d) 10%

41) Which statement is not correct?
a) The stability of hypohalous acids follows the order HClO > HBrO > HIO
b) The acidic nature of hypohalous acids follows the order HClO > HBrO > HIO
c) The oxidising power of hypohalous acids follows the order HIO > HBrO> HClO
d) All are correct

42) The violet colour of iodine is due to the
a) Absorption of UV radiation
b) Absorption of red colour from light
c) Absorption of green colour from light
d) All the above

43) An oxide of chlorine which is an odd electron molecule is
a)
b)
c)
d)

44) Which of the following statements is not correctly matched?
a)
b)
c)
d) All are correct

45) An oxide of chlorine which is widely used in purification of water and as a bleach is
a)
b)
c)
d)

46) In dilute aqueous solution HF is a weaker acid than HI, because
a) The H-F bond energy is greater than H-I bond energy
b) The hydration energy of F is higher than thatr of I
c) Of the presence of H-bond in HF
d) Fluorine is a stronger base than iodine

47) A quick supply of Cl2 gas may be made by reacting crystals of KMnO4 with
a) KCl
b) NaCl
c) Conc. HCl
d) Bleaching powder

48) Swimming pools are disinfected by bubbling through water a controlled quantity of
a)
b)
c)
d)

49) ClF3 and BrF3
a) Behave as oxidizing agent
b) Have T – shaped geometry
c) Are used as fluorinating agent
d) All the above

50) Iodine dissolves in aqueous KI solution
a) By forming iodide ion
b)
c)
d) None

51) The increasing order of reactivity of halogens is
a) I < Br < Cl < F
b) Cl < F < Br < I
c) Cl < Br < I <f< font=””>
d) I < Cl < Br < F

52) Which statement is not correctly matched for the oxyacids of chlorine?
a)
b)
c)
d) All are correct

53) Among halogens, F-F bond energy is the minimum. This is due to the
a) Low I.P.
b) Absence of d-orbitals
c) Low lattice energy
d) Repulsion among non-bonding electrons

54) Fluorine is more reactive than chlorine because
a) Fluorine has less bond dissociation energy
b) Fluorine has a greater IP
c) The
d) Fluorine has no available orbitals

55) Which of the following statements is not correct?
a)
b)
c)
d) All are correct

56) Heat of hydration is maximum in the case of
a)
b)
c)
d)

57) The increasing order of acid strengths of halogen halides is
a) HF < HCl < HBr < HI
b) HF < HI < HBr < HCl
c) HCl < HBr < HI < HF
d) None

58) Which of the following elements is most likely to form a compound of a transition metal in the highest positive oxidation state?
a) Iodine
b) Sulphur
c) Fluorine
d) Phosphorus

59) The products obtained when iodine reacts with Na2S2O3 solution are
a)
b)
c)
d)

60) In the use of chlorine as bleaching agent, the substance that is mainly responsible is
a) HOCl
b)
c)
d) HCl

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

62) Bromine can be obtained by oxidising the
a)
b)
c)
d) None

63) Which of the following elements is used as an antiseptic?
a) Iodine
b) Chlorine
c) Bromine
d) Fluorine

64) Which of the following acids will not act as a reducing agent when mixed with acidified KMnO4 ?
a)
b) HI
c) HF
d) HBr

65) Which of the following has the highest molar heat of vapourisation ?
a) HF
b) HCl
c) HBr
d) HI

66) Iodine reacts with hot conc.solution of NaOH to give
a)
b)
c)
d)

67) Bleaching powder on standing forms a mixture of
a)
b)
c)
d)

68) Which is most stable to heat?
a) HCl
b) HBr
c) HOCl
d) HI

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

70) F2 reacts with dilute NaOH to give oxygen difluoride of the formula
a)
b)
c)
d)

71) Among the fluorides given below which will further react with F2 ?
a) NaF
b)
c)
d)

72) Which of the following is oxidised by KMnO4 or K2Cr2O7?
a) HF
b) HCl
c) HBr
d) HI

73) HI is a stronger acid than HCl due to its
a) Higher % ionic character
b) Higher dipole moment
c) Lower bond energy
d) Higher bond length

74) Halogen atoms have
a) High IE, high EA and low electronegativity
b) High IE, high EA and high electronegativity
c) High IE, low EA and high electronegativity
d) Low IE, high EA, and high electronegativity

75) The halide which fails to give a precipitate with AgNO3 is
a)
b)
c)
d)

76) The tendency to form anion X- is greatest with
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

77) F2, Cl2 are gases, Br2 is a liquid, I2 is a solid because the
a) Size of the atom increases
b) I.E. decreases
c) Basic nature increases
d) magnitude of van der Waals forces increases

78) Elements like C, S, Br, I can show their highest oxidation in combination with
a) F
b) Cl
c) Br
d) H

79) Which of the following oxides of chlorine is the most powerful oxidising agent?
a)
b)
c)
d)

80) Which of the following interhalogens cannot exist?
a)
b)
c)
d)

81) Which of the following are pseudohalides ?
a)
b)
c)
d) All are correct

82) Halogens have been placed in the VII group of the periodic table, because
a) They are non metals
b) They are very reactive
c) They are electronegative
d) They have 7 electrons in the outermost orbit

83) Which of the following interhalogens does not exist?
a) CIF
b)
c)
d)

84) Fluorine absorbs the ..Â……. portion of light and appears yellow
a) Yellow
b) Green
c) Violet
d) Red

85) Which of the following reactions is possible?
a)
b)
c)
d)

86) Which of the following metals are passive towards F2 ?
a) Cu
b) Hg
c) Both
d) None

87) Which one of the following bonds has the highest ionic character?
a) M – F
b) M – Cl
c) M – Br
d) M – I

88) ClO2 is an anhydride of
a)
b)
c)
d) None

89) The correct order of electron affinities of halogens is
a) F > Cl > Br > I
b) Cl > Br > F > I
c) Cl > F > Br > I
d) I > Br > Cl > F

90) Which of the following has the highest dipole moment ?
a) HF
b) HO
c) HBr
d) HI

91) Which of the following has no action with starch solution ?
a)
b)
c)
d) Both a and b

92) Which of the following do not react with water?
a)
b)
c)
d)

93) Fluorine combines with all non metals directly except
a)
b)
c) Xe
d) a and b

94) Which of the following non-metals do not combine directly with Cl2 , Br2 and I2 ?
a) Carbon
b) Nitrogen
c) Oxygen
d) All the above

95) Which of the following does not conduct electricity?
a)
b) HCl
c) HBr
d) HI

96) Fluorine reacts with water and forms
a)
b)
c) HF
d) All the above

97) Which of the following does not give a precipitate with AgNO3 ?
a) HF
b) HCl
c) HBr
d) HI

98) Good quality bleaching powder contains —— available chlorine
a) 10 – 20%
b) 5 – 10%
c) 35 – 38%
d) 20 – 25%

99) The outermost electronic configuration of the element which

does not show a positive oxidation state at all is

a)
b)
c)
d)

100) Which of the following reacts with Cl2 to form bleaching powder?
a) dry slaked lime
b) Moist slaked lime
c)
d) Calcium acetate


Answer

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.