P – BLOCK ELEMENTS – 21

1) @ The oxidation states of the most electronegative element in the products of the reaction of BaO2 with dil. H2SO4 are
a) 0 and1
b) —1 and—2
c) —2 and 0
d) —2 and +1

2) Which of the following has the highest dipole moment?
a)
b)
c)
d)

3) Which of the following has the least bond angle?
a)
b)
c)
d)

4) The number of unpaired electrons in the p-sub-shell of the oxygen atom is
a) 1
b) 2
c) 3
d) 4

5) Which would quickly absorb oxygen ?
a) Alkaline solution of pyrogallol
b)
c) Lime water
d)

6) Oleum is
a) Castor oil
b) Oil of vitriol
c)
d) None of them

7) The sulphur molecule is
a) Diatomic
b) Triatomic
c) Tetratomic
d) Octatomic

8) Which of the following formulae represents fuming sulphuric acid (oleum) ?
a)
b)
c)
d)

9) A substance on treatment with dilute H2S04 liberates a colourless gas which produces (i) turbidity with baryta water and (ii) turns acidified dichromate solution green. These reactions indicate the presence of
a)
b)
c)
d)

10) When sulphur is boiled with Na2SO3 solution, the compound formed is
a) Sodium sulphide
b) Sodium sulphate
c) Sodium persulphate
d) Sodium thiosulphate

11) Polyanion formation is maximum in
a) Nitrogen
b) Oxygen
c) Sulphur
d) Boron

12) Which one of the following properties is not correct for ozone ?
a) It oxidises lead sulphide
b) It oxidises potassium iodide
c) It oxidises mercury
d) It cannot act as a bleaching agent

13) All the following decompose easily on heating to give oxygen except
a) Lead nitrate
b) Potassium chlorate
c) Mercuric oxide
d) Manganese dioxide

14) sp2-Hybridization is involved in the molecules of
a) CO
b)
c)
d) Both b and c

15) The acid which has a peroxy linkage is
a) Sulphurous acid
b) Pyrosulphuric acid
c) Dithionic acid
d)

16) Which has the maximum number of oxo groups?
a)
b)
c)
d)

17) @ SO3 can be obtained by
a)
b)
c)
d) Heating ferric sulphate

18) Acidified solutions of sodium thiosulphate are unstable because in thiosulphate
a) The two sulphur atoms are at an unstable oxidation state of + 2
b) The two sulphur atoms are at different oxidation states of + 6 and —2
c) The S—S bonds are unstable
d) Thio compounds contain S in oxidation state of zero

19) Sometimes a yellow turbidity appears while passing H2S gas even in the absence of II group radicals. This is because
a) Sulphur is present in the mixture as impurity
b) IV group radicals are precipitated as sulphides
c)
d) III group radicals are precipitated as hydroxides

20) K2CS3 can be called potassium
a) Sulphocyanide
b) Thiocarbide
c) Thiocarbonate
d) Thiocyanate

21) Sulphuric acid has great affinity for water because
a) It hydrolyses the acid
b) It decomposes the acid
c) the acid forms hydrates with water
d) the acid decomposes water

22) Heavy water is obtained by
a) Prolonged electrolysis of water
b) Dissolving heavy salt in water
c) Simple distillation of water
d) Removing impurities of calcium and magnesium from water

23) @ A certain compound (X) when treated with copper sulphate solution yields a brown precipitate.On adding hypo solution, the precipitate turns white. The compound is
a)
b) Kl
c) KBr
d)

24) Bromine water reacts with SO2 to form
a)
b)
c) HBr and S
d)

25) Permonosulphuric acid is known as
a)
b)
c) Sulphuric acid
d) None of these

26) Sodium thiosulphate is prepared by
a)
b)
c)
d)

27) @ Sulphuric acid reacts with PCI5 to give
a) Sulphur dichloride
b) Sulphur monochloride
c) Sulphuryl chloride
d) Sulphur tetrachloride

28) Which of the following bonds has the highest energy ?
a) Se—Se
b) Te—Te
c) S—S
d) O—O

29) Hydrolysis of one mole of peroxodisulphuric acid produces
a) 2 moles of sulphuric acid
b) 2 moles of peroxomonosulphuric acid
c) 1 mole of sulphuric acid and 1 mole of peroxomonosulphuric acid
d) 1 mole each of sulphuric acid, peroxomon.sulphuric acid and hydrogen peroxide

30) Which of the following does not react with AgCI?
a)
b)
c)
d)

31) H2S does not produce metallic sulphide with
a)
b)
c)
d)

32) The type of hybridization in a water molecule is
a) sp
b)
c)
d) None

33) Which one of the following compounds has sp2 hybridization?
a)
b)
c)
d) CO

34) Sodium nitrate decomposes above 800°C to give
a)
b)
c)
d)

35) Which of the following hydrides has the Iowest boiling point?
a)
b)
c)
d)

36) The correct order of electron affinity of B, C, O and N is
a) 0 > C > N > B
b) B > N > C > O
c) O > C > B > N
d) O > B > C > N

37) All the elements of the oxygen family are
a) Non metals
b) Metalloids
c) Radioactive
d) Polymorphic

38) Which one of the following hydrides is most acidic ?
a)
b)
c)
d)

39) By passing H2S gas through acidified KMnO4 solution, we get
a)
b) S
c)
d)

40) Which is most acidic in nature ?
a)
b) MgO
c)
d) CaO

41) Which of the following oxides reacts with HCI and NaOH?
a) CaO
b) ZnO
c)
d)

42) Which of the following oxides of chromium is amphoteric in nature?
a) CrO
b)
c)
d)

43) Which one of the following reacts with conc. H2SO4 ?
a) Au
b) Ag
c) Pt
d) Pb

44) Which type of bond is there in H2S molecules ?
a) Ionic
b) Covalent
c) Coordinate
d) All of these

45) What is the oxidation number of sulphur in Na2S4O6 ?
a)
b)
c)
d)

46) Which of the following does not show hydrogen bonding ?
a)
b)
c)
d)

47) The oxidation number of sulphur in S8, S2F2 and H2S is respectively
a) 0, + 1 and -2
b) + 2, + 1 and -2
c) 0, + 1 and + 2
d) -2, + 1 and -2

48) The geometry of H2S and its dipole moment are
a) Angular and non zero
b) Angular and zero
c) Linear and non zero
d) Linear and zero

49) Hybridization in SO3 is
a)
b)
c)
d)

50) The O2 molecule is
a) Ferromagnetic
b) Diamagnetic
c) Paramagnetic
d) None of these

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

52) Which is the best oxidising agent among the following ?
a) S
b) O
c) Se
d) Te

53) Which of the following is formed by the action of water on sodium peroxide ?
a)
b)
c)
d)

54) The compound containing a coordinate bond is
a)
b)
c)
d) All

55) A group 16 element exists in the monoatomic state in the metallic lattices. It also exists in two crystalline forms. The metal is
a) Po
b) S
c) Se
d) Te

56) Which of the following ions does not have an S—S linkage?
a)
b)
c)
d)

57) Amongst H2O, H2S, H2Se and H2Te, the one with the highest boiling point is
a)
b)
c)
d)

58) The oxygen molecule is
a) Diamagnetic with no unpaired electrons
b) Diamagnetic with two unpaired electrons
c) Paramagnetic with two unpaired electrons
d) Paramagnetic with no unpaired electron

59) When potassium ferrocyanide crystals are heated with conc. H2S04, the gas evolved is
a)
b)
c)
d) CO

60) Na2S2O3 is prepared by
a)
b)
c) Heating NaOH and S
d)

61) Which of the following is not a reducing agent ?
a)
b)
c)
d)

62) The number of electrons that are paired in the oxygen molecule is
a) 16
b) 12
c) 14
d) 7

63) The shape of the molecule SF3CI3 is
a) Trigonal bipyramidal
b) Cubic
c) Octahedral
d) Tetrahedral

64) The correct order of O—O bond length (increasing) in O2, H202 and O3 is
a)
b)
c)
d)

65) The number of S—S bonds in sulphur trioxide trimer (S3O9) is
a) Three
b) Two
c) One
d) Zero

66) A yellow metallic powder is burnt in a stream of fluorine to obtain a colourless gas X which is thermally stable and chemically inert. Its molecule has octahedral geometry. Another colourless gas Y with the same constituent atoms as that of X is obtained when sulphur dichloride is heated with sodium fluoride. Its molecule has trigonal bipyramidal geometry. Gases X and Y are respectively
a)
b)
c) NaF and NaCI
d) None of these

67) Concentrated sulphuric acid is a/ an
a) Sulphonating agent
b) Hygroscopic substance
c) Oxidising agent
d) All the above

68) Compounds A and B are treated with dil. HCI separately. The gases liberated are Y and Z respectively. Y turns acidified dichromate paper green while Z turns lead acetate paper black. The compounds A and B are respectively
a)
b)
c)
d)

69) Conc. H2SO4 displaces hydrogen chloride from chlorides because
a) It is a stronger acid
b) Sulphates are less soluble than chlorides
c) Sulphates are more soluble than chlorides
d)

70) A student accidentally splashes a few drops of conc H2S04 on his cotton shirt. After a while, the splashed parts blacken and holes appear. This has happened because sulphuric acid
a) Dehydrates the cotton with burning
b) Causes the cotton to react with air
c) Heats up the cotton
d) Removes the elements of water from cotton

71) SO2 acts as a/an
a) Bleaching agent
b) Oxidising agent
c) Reducing agent
d) All are correct

72) The reducing property of SO2 is shown in the following reaction:
a)
b)
c)
d) Both b and c

73) When sulphur is dissolved in oleum, a deep blue solution containing polyatomic sulphur cations is obtained. The formula of the cation present is
a)
b)
c)
d)

74) The elements showing —2 oxidation states are
a) O
b) S
c) Se
d) All are correct

75) Which of the following elements exist as octaatomic molecules with puckered ring structures?
a) Te
b) S
c) Se
d) All are correct

76) The peroxo acids of sulphur are
a) highly ionised
b) dehydrating agents
c) of high specific gravity and density
d) having high boiling points

77) The elements showing allotropy are
a) O
b) S
c) Se
d) All are correct

78) Which of the following properties decrease from top to bottom down the group in case of the hydrides of oxygen family members?
a) Dipole moment
b) Bond angle
c) Thermal stability
d) All are correct

79) Which of the following are correct statements about hypo (Na2S2O3.5H2O)?
a) It is used in photography to remove AgBr as a fixer
b) It is used to remove iodine stains
c) It is used as an antichlor
d) All are correct

80) Hydrogen sulphide exhibits
a) Acidic properties
b) Basic properties
c) Reducing properties
d) Both a and c

81) The halogen which is solid at room temperature is
a) F
b) Cl
c) Br
d) I

82) The strongest acid among the following is
a)
b)
c)
d) HClO

83) Which of the following halogens is radioactive?
a) F
b) Cl
c) I
d) At

84) Fluorine is the best oxidising agent because
a) It has highest E.A
b) It has highest E° reduction
c) It has highest E° oxidation
d) None of these

85) Which of the following shows only one oxidation state?
a) F
b) Cl
c) Br
d) I

86) The ionic character of H-X is highest in
a) HBr
b) HI
c) HF
d) HCl

87) Bond energy is maximum in the case of
a) Fluorine
b) Bromine
c) Iodine
d) Chlorine

88) The most electropositive halogen is
a) F
b) Cl
c) Br
d) I

89) The halogen having greatest electron affinity is
a) I
b) Cl
c) F
d) Br

90) The smallest atom is
a) F
b) Cl
c) Br
d) I

91) The element which displaces three halogens from their compounds is
a) Cl
b) Br
c) I
d) F

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

93) Which of the following HY (hydra-acid of halogens) is the strongest acid, best reducing agent, is the least stable, and is easily oxidised?
a) HF
b) HCl
c) HBr
d) HI

94) The halogen that is most readily reduced is
a) Chlorine
b) Bromine
c) Iodine
d) Fluorine

95) Which is the correct order of decreasing percentage of acids in the azeotropic mixtures of HX-H2O?
a) HI > HBr > HF > HCl
b) HBr > HCl > HF > HI
c) HF > HCl > HBr > HI
d) None

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

97) The correct order of acid strength is
a)
b)
c)
d) None

98) Among the halogens, which one forms the maximum number of oxides?
a) Fluorine
b) Chlorine
c) Bromine
d) Iodine

99) Chlorine can be manufactured by the
a) Electrolysis of NaCl
b) Electrolysis of brine
c) Electrolysis of bleaching powder
d) All

100) When cold NaOH reacts with Cl2 the product is
a) NaClO
b)
c)
d) None


Answer

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