CHAPTER # 5 Halogens and Noble Gases(F.sc Part 2) Chemistry Mcqs

CHAPTER # 5
Halogens and Noble Gases

1. Which is the most volatile compound?

(A) HI                        (B) HCI
(C) HBr                      (D) HF

2. Which one is the anhydride of HCIO4 ?

(A) CI2O                      (B) CIO2
(C) CI2O6                    (D) CI2O7

3. Which of the following halogens does not form its oxyacids ?

(A) Fluorine                  (B) Chlorine
(C) Bromine                  (D) Iodine

4. Bromine is obtained on a commercial scale from

(A) Caliche                          (B) Carnallite
(C) Common salt                 (D) Cryolite.

5. Iodine deficiency in diet is known to cause

(A) Beriberi                        (B) Goitre
(C) Rickets                          (D) Night blindness

6. Which one of the halogen acid is a liquid ?

(A) HF                                (B) HCI
(B) HBr                               (D) HI.

7. Which of the following acid is weakest

(A) HCIO                           (B) HBr            
(C) HCIO3                         (D) HCI.

8. In which of the following, oxygen has +2 oxidation number ?

(A) F2O                             (B) CI2O
(C) Na2O2                         (D) Na2O.

9. Fluorine does not show positive oxidation states due to the absence of

(A) d-orbitals                         (B) s-orbitals
(C) p-orbitals                         (D) None

10. Which of the following has greatest reducing
      power?

(A) HI                     (B) HBr
(C) HCI                  (D) HI.

11. Bad conductor of electricity is

(A) H2F2                   (B) HCI
(C) HBr                    (D) HI


12. Bleaching power is obtained by the action chlorine gas and

(A) Dilute solution of Ca(OH)2
(B) Concentrated solution of Ca(OH)2
(C) Dry CaO
(D) Dry slaked lime.

13. Mark the element which shows only one oxidation state in its compounds

(A) F                     (B) CI
(C) Br                   (B) I.

14. Which of the following halogens has the highest bond energy ?

(A) F2                    (B) CI2
(C) Br2                   (D) I2.

15. Which halogen is most electropositive ?

(A) F                      (B) CI
(C) Br                     (D) I.

16. Which one of the following is the true covalent
      oxide of iodine ?

(A) I2O4                             (B) I2O5
(B) I2O7                             (D) I2O9

17. Which of the following halogen oxides is ionic?

(A) CIO2                   (B) BrO2
(C) I2O5                    (D) I4O9

18. Which of the following hydrogen halide has the
      highest boiling point ?

(A) HF                        (B) HCI
(C) HBr                       (D) HI.

19. Which of the following is a false statement ?

(A) Hydrogens are strong oxidizing agents
(B) Halogens show only –1 oxidation state
(C) HF molecules form intermolecular
      hydrogen bonding
(D) Fluorine is highly reactive.

20. As the atomic number of 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.








21. 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 ion
(D) They can mutually displace each other
      from the solution of their compounds with
      metals.

22. Which has the highest molar heat of vaporization ?

(A) HF                     (B) HCI
(C) HBr                   (D) HI.

23. Which one of the following reacts with glass ?

(A) H2SO4                    (B) HF
(C) HNO3                     (D) K2Cr2O7

24. Strongest hydrogen bonding is shown by

(A) Water                     (B) Ammonia
(C) Hydrogen fluoride  (D) Hydrogen sulphide.

25. Fluorine is a better oxidizing agent than Br2. It is due to

(A) Small size of fluorine
(B) More electron repulsion in fluorine
(C) More eletronegativity of fluorine
(D) Non metallic nature of fluorine.

26. The element which liberated O2 from water is

(A) P                         (B) N
(C) F                         (D) I.

27. Ozonised oxygen can be obtained from H2O by the action of

(A) Conc. H2SO4          (B) KMnO4
(C) MnO                       (D) F2

28. Which one of the following is most basic ?

(A) F-                  (B) CI-
(C) Br-                 (D) I-

29. Which one of the following elements can have both positive and negative oxidation state?

(A) F                     (B) I
(C) Li                    (D) He.

30. Least chemical activity is shown by

(A) NH3                (B) CH4
(C) Ar                   (D) H2SO4.




31. In discharge tube, noon glows

(A) Bluish            (B) Reddish
(C) Pinkish           (D) Greenish

32. Xef2 molecule is

(A) Linear                 (B) Trigonal planar
(C) Pyramidal           (D) Square planar.

33. The forces acting between noble gas atoms are

(A) Vander Waals forces
(B) Ion-dipole forces
(C) London disperslon forces
(D) Magnetic forces.

34. Percentage of Ar in air is about

(A) 1%                (B) 2%
(C0 3%                (D) 4%

35. The structure of XeF6 is

(A) Distorted octahedral
(B) Pyramidal
(C) Tetrahedral
(D) None of the above

36. The noble gas was first time discovered by

(A) Cavendish               (B) William Ramsay
(C) Lockyer                   (D) Frankland.

37. The coloured discharge tubes for advertisement mainly contain

(A) Xenon                   (B) Helium
(B) Neon                    (D) ARGON

38. Which of the following noble gases does not have an octet of electrons in its outermost
shell ?

(A) Neon                      (B) Radon
(C) Argon                     (D) Helium

39. The lowest boiling point of helium is due to its

(A) Inertness
(B) Gaseous nature
(C) High Polaris ability
(D) Weak Vander Waals forces b/w atoms

40. Which member of group VII A combines with one more halogen?

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




41. The interhalogen formed by iodine requires fluorine atoms

a) 3 b) 5
c) 7 d) 8

42. Which one halogen directly reacts with noble gas?

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

43. Which type of interhalogenis formed by Bromine?

Br – Cl b) Br – F3
Br – F5 d) Br – I 7

44. Iodine occurs as iodate in

a) Chile salt peter b) Clauber’s salt
c) Blue vitriol d) Oil of vitriol

45. Which one hydride has greater ionic character and had H – bond?

a) HF b) HBr
c) HCl d) HI

46. Chlorine reacts with hot solution of NaOH to form

a) NaCl b) NaClO3
c) NaClO d) All of these

47. Fluorine directly combines with noble gases

a) Kr b) Xe
c) Rn d) All of these

48. The density of pure liquid HF is less then water due to

Covalent bond formations
High electron affinity
Absence of three dimensional net work of H – bond
Presence of three dimensional net work of H – bond

49. The order of increasing dissociation of HX at 1000oC is

HI (33%) > HBr (0.5%) > HCl (0.014%) > HF (0%)
HBr > HI > HF > HCl
HCl > HBr > HI > HF
HF > HCl > HBr > HI

50. The halogen which form unstable oxides is

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

51. The most recently prepared oxyacid of halogen is

a) HOCl b) HBrO3
c) HIO d) HOF

52. The increasing order of acidity and oxidizing power of Oxyacids due to increasing number of oxygen atoms is

HXO > HXO2 > HXO3 > HXO4
HXO4 > HXO3 > HXO2 > HXO
HXO3 > HXO2 > HXO4 > HXO
None of these

53. The average available chlorine in bleaching powder is

a) 30 – 35% b) 35 – 40%
c) 40 – 45% d) 45 – 50%

54. Which one is false for bleaching powder?

Highly soluble in water
Light yellow color powder
Oxidizing agent
Release Cl2 gas by reaction with dilute acids

55. Sea weeds are important sources of

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

56. The acid used for etching glass is

a) HCl b) HF
c) HNO3 d) HClO4

57. Which one interhalogen can further combine with fluorine?

a) F – Cl b) ClF3
c) BrF5 d) IF5

58. Which statement is true?

Except F2O, the oxides of all halogen are endothermic compounds
The higher oxides of halogen are more stable than lower oxides
The bond in the halogen oxides are largely covalent due to similarities in electronegativity
All of these

59. Iodine is highly soluble in

a) Solution of Kl b) Alcohol
c) CS2 d) All of these





60. HF is not preserved in glass bottle because

It reacts with SiO2 of the glass
It reacts with the Al2O3 of the composition
It reacts with the Na2O of the composition
It reacts with the visible part of light

61. Fluorine can be transported in a special container made up of

a) Aluminum b) Steel
c) Glass d) Carbon steel

62. Chlorine can be easily liquefied and is usually marketed in

Steel cylinders
Iron cylinders
Carbon steel cylinders
Glass cylinders

63. Halogen do not occur free in nature because they

Are salt producer
Are highly reactive
Has seven electrons in their valence shell
Are non metals

64. Xenon trioxide is formed by

Hydrolysis of xenon hexafluoride
Hydrolysis of barium per xenate
Hydrolysis of xeondifloride
None of these

65. The known fluorides of xenon are

a) XeF2 b) XeF4
c) XeF6 d) All of the above

66. Mixture of 80% helium and 20% oxygen is used for

Breathing air by seas divers
Breathing by patient
Breathing by fishes
All of these

67. Tyres of large aeroplane contain

a) He b) Ne
c) Ar d) Kr

68. Which xenon fluoride is impossible?

a) XeF2 b) XeF4
c) XeF6 d) XeF3






69. The type of hybridization does the oxygen has in OF2 is

a) SP2 b) d2SP3
c) SP3 d) dSP3

70. The gas that will liquefy with most difficulty is

a) He b) CO2
c) NH3 d) SO2

71. Which of the following is radioactive?

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

72. The electron affinity of halogens is of the order

a) F < Cl > Br > I b) F < Cl < Br < I
c) Cl < F < Br < I d) I < Br < F < Cl

73. Which of the following hydride of halogen is
thermally most stable?

a) HF b) HCl
c) HBr d) HI

74. In which of the following bromine has an
oxidation state of + 4?

a) Br2O b) BrO2
c) BrO3 d) None

75. Electrolysis of Brine produces _______

a) Chlorine b) Oxygen
c) H2S d) Nitrogen

76. In which of the following oxyacids, chlorine has
an oxidation state of +3?

a) HClO b) HClO2
c) HClO3 d) HClO4

77. The process based on the oxidation of
hydrochloric acid with oxygen is ______

a) Nelson’s cell b) Contact process
c) Down’s process d) Deacon’s process

78. Chlorine gas is ______ in color.

a) Yellow b) Greenish Yellow
c) Violet d) Blue

79. To kill bacterial, moist of the drinking water is
treated with _______

a) Nitrogen b) Carbon dioxide
c) Chlorine d) Hydrogen sulphide





80. Phosgene is the common name of _______

a) Carbon dioxide and phosphate
b) Phosphoryle chloride
c) Carbonyle chloride
d) Carbon tetrachloride

81. Hydrofluoride acid is _________

a) A powerful oxidizing agent
b) A weak acid
c) A strong acid
d) A good reducing agent

82. Bleaching powder is obtained by the
interaction of Cl2 and _______

a) Slaked lime
b) Conc. Solution of Mg(OH)2
c) Dry CaO
d) Dry slaked lime

83. The element which liberates O2 form water is

a) P b) N
c) F d) I

84. Which forms maximum compounds with
xenon?

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

85. Which of the following rare gases is not
present in the atmosphere?

a) He b) Xe
c) Kr d) Rn

86. The structure of XeOF4 is

a) Tetrahedral            b) Square pyramidal
c) Distorted            d) Irregular pentagonal

87. Which of the following fluorides of xenon is not
observed?

a) Xef b) XeF2
c) XeF4 d) XeF6