P – BLOCK ELEMENTS – 20

1) Consider the isoelectronic series K+, S2-, Cl and Ca2+. The radii of the ions decrease in the order
a)
b)
c)
d)

2) The oxygen molecule shows
a) Paramagnetism
b) Diamagnetism
c) Ferromagnetlsm
d) Ferrimagnetism

3) The element of group 16 that behaves as a typical metal is
a) Sulphur
b) Selenium
c) Tellurium
d) Polonium

4) Which of the following elements behaves as a typical non-metal ?
a) S
b) Se
c) Te
d) Po

5) The element which exhibits allotropy is
a) Hydrogen
b) Bismuth
c) Oxygen
d) Chlorine

6) Amongst the following pairs, the one which does not represent allotropes is
a) Oxygen, ozone
b) Hydrogen, deuterium
c) Red P, yellow P
d) Diamond, graphite

7) Which element is most abundant in the earths crust ?
a) Ca
b) C
c) Si
d) O

8) Ordinary oxygen contains
a)
b)
c)
d)

9) The oxidation state of oxygen in 02F2 is
a) + 1
b) + 2
c) +4
d) -2

10) Oxygen exhibits a positive oxidation state in
a) CO
b)
c) NO
d)

11) The oxidation state of S in H2SO4 is
a) +2
b) +4
c) + 6
d) zero

12) Oxygen is always divalent whereas sulphur can form 2, 4, and 6 bonds. This is because
a) Oxygen is more electronegative than sulphur
b) Sulphur contains d-orbitals whereas oxygen does not
c) Sulphur has a larger atomic radius than oxygen
d) Sulphur is more electronegative than oxygen

13) The formula of the sulphur molecule is
a)
b)
c)
d)

14) The first ionization energy of group 16 elements
a) Falls sharply from oxygen to sulphur and then falls regularly from sulphur to tellurium
b) Falls regularly from oxygen to tellurium
c) Rises regularly from oxygen to tellurium
d) Rises slightly from oxygen to tellurium and then falls regularly from sulphur to tellurium

15) Which of the following elements does not show an oxidation state of + 4 ?
a) O
b) S
c) Se
d) Te

16) Which of the following elements of group 16 is radioactive ?
a) Oxygen
b) Selenium
c) Polonium
d) Tellurium

17) Which one of the following cannot expand its outer shell of electrons beyond the octet ?
a) Oxygen
b) Selenium
c) Sulphur
d) Tellurium

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

19) Which one of the following has the lowest boiling point ?
a)
b)
c)
d)

20) Which one of the following has a bond angle very close to 900?
a)
b)
c)
d)

21) Which of the following is the most electronegative element ?
a) O
b) S
c) Se
d) Te

22) The bond angles of the hydrides of group 16 elements decrease as we move down the group. This is because of the
a) Increase in bond pair-bond pair repulsion
b) Decrease in bond pair-bond pair repulsion
c) Decrease in electronegativity of the central atom
d) Increase in electronegativity of the central atom

23) The increasing thermal stability of the hydrides of group 16 follows the sequence
a)
b)
c)
d)

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

25) The correct order of increasing boiling point is
a)
b)
c)
d)

26) Which of the following has the maximum hydrogen bonding ?
a)
b)
c)
d)

27) The anomalous boiling point of water is due to
a)
b) Ionic bonding
c) Covalent bonding
d) Hydrogen bonding

28) Which of the following compounds is most acidic ?
a)
b)
c)
d)

29) Oxygen is more electronegative than sulphur but H2S is acidic in aqueous solution while H2O is neutral. This is because
a)
b) H—S bond is weaker than O—H bond
c)
d)

30) Which of the following statements about H2S is not correct?
a) It is a gas at room temperature
b) It is a covalent compound
c) It is a weak base in aqueous solution
d) It is a much stronger reducing agent than water

31) In H2S, sulphur is
a)
b)
c) sp-Hybridized
d)

32) ln SF4, sulphur is
a)
b)
c)
d)

33) In S8 molecule, the type of hybridization exhibited by sulphur is
a)
b)
c) sp
d)

34) Which of the following compounds does not give oxygen on heating ?
a) Mercuric oxide
b) Potassium chlorate
c) Potassium permanganate
d) Ammonium dichromate

35) The bleaching action of SO2 is due to
a) Reduction
b) Oxidation
c) Hydrolysis
d) Its acidic nature

36) In presence of water, SO2 acts as a
a) Reducing agent
b) Oxidising agent
c) Dehydrating agent
d) None of the above

37) Amongst the following the compound which is moderately basic is
a)
b)
c)
d)

38) Which of the following is used as an oxidising agent in Organic Chemistry ?
a)
b)
c)
d)

39) Which of the following is a non-linear molecule?
a)
b)
c)
d)

40) The shape of the sulphate ion is
a) Tetrahedral
b) Square planar
c) Trigonal bipyramid
d) Hexagonal

41) A pale yellow precipitate and a gas with a pungent odour are formed on warming dilute hydrochloric acid with an aqueous solution containing
a) Sulphate ion
b) Sulphideion
c) Thiosulphate ion
d) Sulphiteion

42) When a dilute solution of hypo is treated with AgNO3 solution, a black precipitate is finally formed which is due to
a)
b)
c)
d)

43) The S— S— S bond angle in S8 molecule is
a)
b)
c)
d)

44) In S8 molecule, each S atom is associated with how many single covalent bonds ?
a) 3
b) 4
c) 2
d) 1

45) The number of lone pairs of electrons present on each S atom in S8 molecule are
a) 2
b) 4
c) 1
d) None

46) The increasing order of volatility of hydrides of group 16 elements is
a)
b)
c)
d)

47) The total number of single covalent bonds present in one S8 molecule are
a) 4
b) 6
c) 8
d) 10

48) The total number of lone pairs of electrons present in a S8 molecule is
a) 8
b) 16
c) 12
d) 4

49) The hydride of group 16 elements showing maximum tendency for complex formation is
a)
b)
c)
d)

50) The hydride of group 16 elements which shows greater Lewis base character is
a)
b)
c)
d)

51) The least covalent hydride out of the following is
a)
b)
c)
d)

52) The correct increasing order of dipole moments of the following is
a)
b)
c)
d)

53) Which of the following is not hydrolysed ?
a)
b)
c)
d) None

54) The halogen showing the maximum coordination number of sulphur in SXn halides is
a) F
b) Br
c) I
d) Cl

55) The correct order of the X—O—X bond angles are
a)
b)
c)
d)

56) The correct order of decreasing stability of hexa fluorides of group 16 members is
a)
b)
c)
d)

57) The hexa fluoride which is easily hydrolysed is
a)
b)
c)
d) None

58) The type of hybridization and possible geometry of tetrafluorides of members of oxygen family are
a)
b)
c)
d)

59) The most stable tetrachloride formed by group 16 elements is
a)
b)
c)
d)

60) The acidic character of the dioxides of the members of the oxygen family decreases in the order
a)
b)
c)
d)

61) The least stable dioxide of group 16 elements is
a)
b)
c)
d)

62) The oxide which acts as a reducing, oxidising, bleaching agent and a Lewis base is
a)
b)
c)
d) NO

63) The molecule having one p – p and two p-d bonds is
a)
b)
c)
d)

64) The acid containing a S—O—O—S bond is
a)
b)
c)
d)

65) The oxidation state of S in H2SO5 is
a) + 4
b) +6
c) +7
d) + 5

66) If X is a member of the chalcogen family, the highest stability of X2- is exhibited by
a) Oxygen
b) Selenium
c) Tellurium
d) Sulphur

67) In SCI2 the central atom involves hybridization of
a)
b)
c)
d)

68) In the reaction 2 H2S + SO2 3 S + 2 H2O, SO2 behaves as an
a) Reductant
b) Oxidant
c) Acid
d) Base

69) Which of the following is a monobasic acid ?
a)
b)
c)
d)

70) Yellow ammonium sulphide is
a)
b)
c)
d)

71) Oxygen is denser than air, so it is collected over
a)
b) Spirit
c) Mercury
d) Kerosene oil.

72) @ Which of the following is used to absorb sulphur dioxide?
a)
b) KOH solution
c) Water
d)

73) The oxygen molecule exhibits
a) Paramagnetism
b) Diamagnetism
c) Ferromagnetism
d) Ferrimagnetism.

74) In the reaction 2 Ag + H2SO4 Ag2SO4 + 2H2O + SO2, H2SO4 acts as a/an
a) Reducing agent
b) Oxidising agent
c) Catalytic agent
d) Dehydrating agent

75) RRR Heavy water is
a)
b) Water obtained by repeated distillation
c)
d)

76) A gas which cannot be collected over water is
a)
b)
c)
d)

77) What is formed when CI2 is bubbled through molten sulphur ?
a)
b)
c)
d)

78) The hybridization of sulphur in SO2 is
a) sp
b)
c)
d)

79) The compound which gives off oxygen on moderate heating is
a) Cupric oxide
b) Mercuric oxide
c) Zinc oxide
d) Aluminium oxide

80) Which of the following is oxidised by SO2 ?
a) Mg
b)
c)
d) All

81) The bleaching action of SO2 is due to
a) Reduction
b) Oxidation
c) Hydrolysis
d) Its acidic nature

82) Which is incorrect about H2SO4? It is a
a) Reducing agent
b) Dehydrating agent
c) Sulphonating agent
d) Highly viscous

83) The first ionization potentials in electron volts of the nitrogen and oxygen atoms are given by respectively
a) 14.6, 13.6
b) 13.6, 14.6
c) 13 6, 13.6
d) 14.6, 14.6.

84) When a lead storage battery is discharged, what happens?
a) Sulphur dioxide is evolved
b) Lead sulphate is consumed
c) Lead is formed
d) Sulphuric acid is consumed

85) Hypo is used in photography to
a) Reduce AgBr grains to metallic silver
b) Convert metallic silver to silver salt
c) Remove undecomposed silver bromide as a soluble complex
d) Remove reduced silver

86) The most abundant element on earth is
a) O
b) S
c) Se
d) Te

87) Hypo is used in photography because of its
a) Reducing behaviour
b) Oxidising behaviour
c) Complex forming behaviour
d) Reaction with light

88) Oxygen will directly react with each of the following elements except
a) P
b) Cl
c) Na
d) S

89) As a fixing agent in photography, sodium thiosulphate is used for
a) Dissolving out the unreacted silver bromide
b) Converting silver halides to metallic silver
c) Reducing solubility of AgBr
d) Preventing overdeveloping and fogging

90) The formula of ozone is O3, and it is
a) An allotrope of oxygen
b) a compound of oxygen
c) an isotope of oxygen
d) None of the above

91) When SO2 is passed through acidified K2Cr2O7 solution
a) The solution turns blue
b) The solution is decolourised
c)
d)

92) @ When conc. H2SO4 comes in contact with sugar, it becomes black due to
a) Hydrolysis
b) Hydration
c) Decolourisation
d) Dehydration

93) The acid used in lead storage cells is
a) Phosphoric acid
b) Nitric acid
c) Sulphuric acid
d) Hydrochloric acid

94) The products of the chemical reaction between Na2,S2O3, CI2 and H2O are
a)
b)
c)
d)

95) The bond angle is minimum for
a)
b)
c)
d)

96) Which of the following oxides is a peroxide ?
a)
b)
c) BaO
d)

97) @ Iodine oxidises the ion to
a)
b)
c)
d)

98) Ozone is not
a) An allotrope
b) A powerful oxidising agent
c) Paramagnetic
d) A bent molecule

99) Which liberates SO2 with dil. H2SO4 ?
a)
b)
c)
d)

100) There is no S—S bond in
a)
b)
c)
d)


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