P – BLOCK ELEMENTS – 27

1) On heating KCIO3 we get
a)
b)
c)
d)

2) The correct order of increasing oxidizing power is
a)
b)
c)
d)

3) Freon is used as a
a) Refrigerant
b) Catalyst
c) Oxidant
d) Both (b) and (c)

4) Which of the following halogens does not exhibit a positive oxidation state in its compounds?
a) Cl
b) Br
c) I
d) F

5) When Kl and CuSO4 solutions are mixed, it gives
a)
b)
c)
d)

6) Which of the following contains iodine?
a) lodex
b) Seaweed
c) Tincture of iodine
d) All of the above

7) A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fire works and safety matches. The gas and halate are respectively
a)
b)
c)
d)

8) The correct order of acidic strength is
a)
b)
c)
d)

9) The reaction of KMnO4 and HCI results in the
a)
b)
c)
d)

10) When I2 is passed through KCI, KF, KBr solutions
a)
b)
c)
d) None of these

11) Which of the following is incorrect with respect to the property indicated?
a) E.N : F > Cl > Br
b) E.A : Cl > Br < F
c)
d)

12) The halogen that is most easily reduced is
a)
b)
c)
d)

13) Seaweed is an important source of
a) Iodine
b) Bromine
c) Sulphur
d) Chlorine

14) Which of the following is most volatile?
a) HI
b) HBr
c) HCI
d) HF

15) The hybridization in ICI7 is
a)
b)
c)
d)

16) The correct decreasing order of acidic character is
a) HCIO > HBrO > HIO
b) HIO > HBrO > HCIO
c) HBrO > HIO > HCIO
d) HCIO > HIO > HBrO

17) The reaction ® + is an example of a/an
a) Oxidation reaction
b) Reduction reaction
c) Disproportionation reaction
d) Decomposition reaction

18) Halon-1301 is
a)
b)
c)
d)

19) Desicchlora is
a) Anhydrous barium perchlorate
b) Anhydrous calcium chloride
c) Anhydrous magnesium per chlorate
d)

20) Which of the following is called super acid?
a)
b)
c) HOCN
d) Both (a) and (b)

21) Bleaching mixture is
a)
b) NaCI + NaOCI
c) Bleaching powder + chlorine
d)

22) Which of the following acts as an acid in sulphuric acid?
a)
b)
c) Water
d)

23) The aqueous solution of which of the following is known as Javelle water?
a) NaCI
b)
c)
d) NaOCI

24) Which of the following is called anhydrone?
a)
b)
c)
d)

25) Which of the following is called Berthelots salt ?
a)
b) NaOCI
c)
d)

26) Which halogen oxidises water to oxygen exothermally?
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

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

28) In the oxyacids of chlorine the Cl—O bond contains
a)
b)
c)
d) None of the above

29) Iodine flasks when rubbed with liquor ammonia give a dark brown precipitate of
a)
b)
c)
d)

30) Which of the following hydrogen halides is liquid at 25°C?
a) HF
b) HCI
c) HBr
d) None of the above

31) Which of the following properties does not correspond to the order HI < HBr < HCI < HF ?
a) Thermal stability
b) Reducing power
c) Ionic character
d) Dipole moment

32) The colour of an iodine solution is discharged by shaking with
a) Sodium sulphate
b) Sodium sulphide
c) Aqueous sulphur dioxide
d) Sodium bromide

33) Of the following which would not have a triangular planar shape?
a)
b)
c)
d) Both (a) and (b)

34) The species that undergoes disproportionation in an alkaline medium is/are
a)
b)
c)
d) (a) and (c)

35) When CI2 gas is passed through hot conc. NaOH solution, the compound(s) formed is/are
a) NaCI
b)
c)
d) (a) and (b)

36) Iodine can be obtained from Nal solution by the action of
a) Chlorine
b) Bromine
c) Soluble chloride
d) Both (a) and (b)

37) Which of the following is incorrect?
a) Chlorine is insoluble in water
b) Iodine is more reactive than bromine
c) Bromine is more reactive than chlorine
d) All of the above

38) The reaction of sodium thiosulphate with I2 gives
a) Sodium iodide
b) Sodium sulphite
c) Sodium tetrathionate
d) Both (a) and (c)

39) Which of the following halogens turns starch iodide paper blue?
a)
b)
c)
d) Both (a) and (b)

40) Iodine imparts a brown colour to
a) Water
b) Benzene
c) Alcohol
d) Both (a) and (c)

41) The noble gas atoms in the liquid or solid state are held by
a) H-bonds
b) Covalent bonds
c) van der Waal’s forces
d) All of these

42) The noble gases which do not form interstitial compounds are
a) Ar
b) Kr
c) Xe
d) All of these

43) The electronegativity of an inert gas is
a) High
b) Low
c) Negative
d) Zero

44) The last member of the inert gas element family is
a) Helium
b) Neon
c) Argon
d) Radon

45) Which of the following noble gases is most reactive?
a) He
b) Ne
c) Kr
d) Xe

46) The shape of XeF4 molecules is
a) Linear
b) Triangular planar
c) Pyramidal
d) Square planar

47) The inert gas abundantly found in the atmosphere is
a) Xe
b) Kr
c) Ar
d) He

48) Which of the following has the highest boiling point?
a) Kr
b) Xe
c) Ar
d) He

49) In which noble gas are the van der Waal’s forces strongest ?
a) Ne
b) Ar
c) Kr
d) Xe

50) Which noble gas is most difficult to liquefy and solidfy ?
a) He
b) Ne
c) Ar
d) Kr

51) Among the noble gases, xenon reacts with fluorine to give stable xenon fluorides because
a) Its size is largest
b) It has the lowest ionisation energy
c) It has the highest ionisation energy
d) It is the most readily available gas

52) Radon is a noble gas. Its radioactivity is used in the treatment of
a) Typhoid
b) Cancer
c) Cough and cold
d) None

53) Which of the following noble gases does not have an octet of electrons in its outer most
shell ?

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

54) Who among the following first prepared a stable compound of noble gas ?
a) Rutherford
b) Rayleigh
c) Ramsay
d) Neil Bartlett

55) Monazite on heating gives
a) Ne
b) He
c) Ar
d) Ra

56) The name argon means
a) Noble
b) New
c) Inert
d) Radioactive

57) The inert gases present in the atmosphere are
a) He and Ne
b) He, Ne and Ar
c) He, Ne, Ar and Kr
d) All the inert gases are present except Rn

58) The shape of XeO3 is
a) Trigonal bipyramidal
b) Pyramidal
c) Square planer
d) Distorted octahedral

59) The first noble gas compound obtained was
a)
b)
c)
d)

60) Who observed helium first on the earth ?
a) Lothar Meyer
b) Ramsay
c) Scheele
d) Hillerbrand

61) A clathrate compound may be properly defined as a
a) Hydrate
b) Solid solution
c) Zeolite
d) Cage-compound

62) Which of the following has the maximum solubility in water ?
a) Ne
b) Ar
c) Kr
d) Xe

63) The noble gases have the highest ionisation energy due to the
a) Large atomic size
b) Stable valence shell electronic configuration
c) High nuclear charge
d) Low electron affinity

64) The forces of cohesion in liquid helium are
a) Covalent
b) Ionic
c) van der Waal’s
d) Metallic

65) Which of the following gases is not called a man-made gas ?
a) He
b) Ne
c) Xe
d) Kr

66) The atomic number of the next-to-be discovered noble gas below Rn (radon) would be
a) 109
b) 118
c) 173
d) 222

67) Which of the following does not form clathrates?
a) Xe
b) Kr
c) He
d) Ar

68) Which of the following is not correct?
a) Xe is the most reactive among the rare gases
b) He is an inert gas
c) Radon is obtained from decay of radium
d) The most abundant rare gas found in the atmosphere is He

69) In solid argon, the atoms are bonded by
a) Ionic bonds
b) Hydrogen bonds
c) van der Waal’s forces
d) None

70) A helium atom on losing an electron becomes a/an
a) Alpha- particle
b) Hydrogen atom
c) Positively charged helium ion
d) Negatively charged helium ion

71) Which of the following species is not present in an electric discharge tube containing He?
a)
b)
c)
d)

72) The gradual addition of electronic shells in the noble gases causes a decrease in their
a) Atomic radius
b) Ionisation energy
c) Boiling points
d) Density

73) In the solid state, xenon atoms are held together by
a) Hydrogen bonds
b) van der Waal’s forces
c) Ionic bonds
d) Covalent bonds

74) Clathrate compounds are used
a) To store radioactive isotopes of Kr and Xe
b) To absorb gamma radiation
c) In analysis
d) In medicine

75) The maximum number of compounds is formed by
a) He
b) Ne
c) Ar
d) Xe

76) In XeO3 the Xe is
a)
b)
c)
d)

77) The electron affinity of noble gas is
a) High
b) Low
c) Zero
d) Negative

78) Which of the following is called stranger gas?
a) Kr
b) Xe
c) He
d) Ne

79) Which of the following statements regarding noble gases is false ?
a) They are all monoatomic
b) All of them are gases at room temperature
c) They are completely soluble in water
d) They have zero electron affinity

80) Which of the following is least polarisable?
a) He
b) Xe
c) Kr
d) Ne

81) The noble gas found in the mineral clevite and in some wells of Kansas city (U.S.A.) is
a) He
b) Ne
c) Ar
d) Kr

82) Which of the following xenon compounds has a square planar structure?
a)
b)
c)
d) None of these

83) In XeO4 , Xe is
a)
b)
c) sp hybridised
d)

84) Which of the following gases has the highest polarisability?
a) He
b) Ar
c) Kr
d) Xe

85) What type of hybridisation is involved in XeF4 and what is its geometry ?
a)
b)
c)
d)

86) In XeF2, Xe is
a) sp hybridised
b)
c)
d)

87) The gas used for inflating the tyres of aeroplanes is
a)
b) He
c)
d) Ar

88) On moving down the group from He to Rn, the boiling points
a) Increase
b) Decrease
c) Irregularly increase
d) Irregularly decrease

89) An asthma patient uses a mixture for respiration containing
a)
b)
c)
d)

90) Helium is used in gas balloons instead of hydrogen because
a) It is lighter than hydrogen
b) It is incombustible
c) It is more abundant than hydrogen
d) Its leakage can be detected easily because it is radioactive

91) The noble gas whose IP is almost equal to that of oxygen is
a) He
b) Ar
c) Kr
d) Xe

92) How many lone pairs are associated with xenon in xenon difluoride?
a) 1
b) 2
c) 3
d) 4

93) A radioactive element X decays to give two inert gases. X is
a)
b)
c)
d)

94) Which of the following does not exist?
a)
b)
c)
d)

95) Xenon best reacts with the
a) Most electropositive element
b) Most electronegative element
c) Neutral atom
d) None of these

96) Xenon forms compounds only with
a)
b)
c)
d)

97) The least soluble in water from all the following is
a) Ne
b) Kr
c) Xe
d) He

98) The shape of KrF2 is
a) Linear
b) Triangular
c) Bent
d) Angular

99) Noble gases can be separated by
a) Passing them through some solutions
b) Electrolysis of their compounds
c) Adsorption and desorption on coconut charcoal
d) None

100) The inert gas that is substituted for nitrogen in the air used by deep sea divers for breathing is
a) Xe
b) Kr
c) Ne
d) He


Answer

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