P – BLOCK ELEMENTS – 8

1) Compounds A and B are treated with dilute HCl separately. The gases liberated are Y and Z respectively. Y turns acidified dichromate paper green, while Z turns lead acetate paper black. So A and B are respectively
a)
b)
c)
d)

2) Which of the following is a liquid?
a)
b)
c)
d)

3) Which of the following undergoes hydrolysis easily?
a)
b)
c)
d) None

4) A diamagnetic element burns in air to form a dioxide. This dioxide can reduce iodine to HI. When H2 gas is bubbled through this element, it forms a hydride. It was found that the reaction of the dioxide and hydride of this element produces the same metal again. The element is
a) S
b) Si
c) Te
d) PO

5) The tendency to form divalent anions decreases from oxygen to Po as the
a) Size of atom increases
b) E.N. decreases
c) I.E. decreases
d) All the above

6) That sulphur has the greatest capacity for catenation is evident from the formation of
a)
b)
c) Poly sulphonic acids
d) All the above

7) The reducing power of hydrides decreases from H2O to H2Te as the
a)
b) Stability of the hydrides decreases
c) bond angle decreases
d) All the above

8) The element which liberates oxygen gas from water is
a) P
b) Na
c) F
d) I

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

10) An element used in xerography, in photo electric cells and as a rectifier in semiconductor devices is
a) Se
b) Po
c) Ge
d) S

11) Which of the following turns lead acetate paper black?
a)
b)
c)
d)

12) O2 gas is chemically inert at room temperature, because
a)
b) O = O bonds are strong
c) O2 molecules do not collide with suficient force to break their bonds at ordinary temperatures
d) All the above

13) Water is liquid because of
a) Covalent bonding involving H atoms
b) Odd electron bond involving H atom
c) Ionic bonding involving H atom
d) Weak dipole dipole interaction involving hydrogen atoms

14) Which is not correct in the case of H2SO4?
a) Reducing agent
b) Oxidising agent
c) Sulphonating agent
d) Highly viscous

15) The low volatility of H2SO4 is due to
a) Hydrogen bonding
b) van der Waals forces
c) Strong bonds
d) None

16) Which dissolves in H2SO4 to give oleum?
a)
b)
c)
d)

17) Oil of vitriol is
a)
b)
c)
d)

18) When sugar is treated with conc. H2SO4 the sugar becomes black due to
a) Hydrolysis
b) Hydration
c) Decolourisation
d) Dehydration

19) Concentrated sulphuric acid is not
a) Efflorescent
b) Hygroscopic
c) Oxidising agent
d) Sulphonating agent

20) The molecule having the smallest bond angle is
a)
b)
c)
d)

21) Which of the following acids is used for making explosives, pigments,

dyes and detergents etc.?
a) HCl
b)
c)
d)

22) The catalyst used in the contact process for H2SO4 is
a) Nitric oxide
b)
c)
d) Finely divided Ni

23) The binary compounds of oxygen and fluorine are known as fluorides (not oxides) because
a)
b) The size of O is greater than F
c) F is more electronegative than O
d) O is a better oxidising agent than F

24) The compound displaying the greatest acid strength in aqueous solutions is
a)
b)
c)
d)

25) A solution of SO2 in water reacts with H2S to precipitate sulphur. Here SO2 acts as
a) An oxidising agent
b) A reducing agent
c) A catalyst
d) An acid

26) The acid having peroxy linkage is
a)
b) Pyrosulphuric acid
c) Sulphurous acid
d) Dithionic acid

27) H2S differs from water in all the following except
a) It is a stronger acid
b) It has a lower boiling point
c) It is a stronger reducing agent
d) It is more resistant to thermal decomposition

28) The hybridisation of S in SO3 is
a) sp
b)
c)
d)

29) SO3 exists as a
a) Triangular planar molecule in gaseous phase & cyclic trimer in the solid state
b) Cyclic tetramer in the solid state
c) Net-work solid
d) All of these

30) H2SO4 acts as a dehydrating agent in reaction with
a)
b) Zn
c) KOH
d)

31) Which of the following would quickly absorb oxygen?
a) Alkaline solution of pyrogallic acid
b)
c) Lime water
d)

32) SO2 can act as a strong oxidising agent in a/an
a) Acidic medium
b) Basic medium
c) Neutral medium
d) None

33) SO3 is obtained by heating
a)
b) Sulphur in air
c)
d)

34) The reaction between copper and hot conc. H2SO4 produces
a)
b)
c)
d)

35) When SO2 gas is passed through an acidified K2Cr2O7 solution
a) The solution becomes blue
b)
c)
d) The solution becomes colourless

36) Ozone gives a brown colour with
a) Benzidine
b) Starch iodine
c) Lead acetate
d) Tetra methyl base

37) In the atmosphere N2 is present as an element with O2 because
a)
b)
c)
d)

38) The high viscosity and B.P. of H2SO4 is
a) Reflected in its structure
b) Due to its capacity to form H – bonds
c)
d) None of these

39) H2S is more acidic than H2O because
a) Oxygen is more electronegative than sulphur
b) the atomic number of sulphur is greater than that of oxygen
c) the H-S bond is weaker than the H-O bond
d) the H-O bond is weaker than the H-S bond

40) H2SO4 is used to displace strong acids such as HClO4 , HNO3, HCl from their salts because of its
a) High viscosity
b) High dielectric constant
c) High B.P
d) High solubility in water

41) An element forms a gaseous oxide which on dissolving in water gives an acid solution. The element is
a) S
b) Na
c) Ca
d) H

42) O3 reacts with KI solution to produce
a)
b)
c)
d) HI

43) In the preparation of H2S2O7
a)
b)
c)
d)

44) Caros acid is
a)
b)
c)
d)

45) Hypo is used in photography to
a) Reduce AgBr grains to metallic Ag
b) Convert metallic Ag to sliver salt
c) Remove undecomposed AgBr as a soluble complex
d) Remove reduced Ag

46) When different metals, like Zn, Sn, Fe are added to dilute H2SO4 , some gas, which burns explosively in air is evolved. The gas is
a)
b)
c)
d)

47) The bond angle is maximum in which of the following hydrides?
a)
b)
c)
d)

48) Which one of the following multiple bond formation with C is more stable?
a) S = C = S
b) Se = C = Se
c) Te = C = Te
d) Po = C = Po

49) Which of the following does not give oxygen on heating?
a) HgO
b)
c)
d)

50) Which of the following possesses the highest ionisation energy?
a) Oxygen
b) Sulphur
c) Tellurium
d) Selenium

51) Ozone is obtained from oxygen
a) By oxidation at high temperature
b) By oxidation using a catalyst
c) By conversion at high pressure
d) By silent electric discharge

52) SO2 reacts with Cl2 to yield
a) Thionyl chloride
b) Carbonyl chloride
c) Sulphuryl chloride
d) Sulphur mono chloride

53) A gas that cannot be collected over water is
a)
b)
c)
d)

54) Which of the following is not correct in the case of ozone?
a) It oxidises lead sulphide
b) It oxidises KI
c) It oxidises Hg
d) It cannot act as a bleaching agent

55) H2SO4 can be distinguished from H2SO3 by the addition of
a) Litmus solution
b)
c)
d) Magnesium powder

56) A sulphite ion has a/an
a) Square planar structure
b) Angular structure
c) Pyramidal structure
d) Tetrahedral structure

57) The anhydride of pyrosulphuric acid is
a)
b)
c)
d)

58) The O-O bond length in ozone is
a)
b)
c)
d)

59) The boiling points of the hydrides of VI A group elements decrease in the order
a)
b)
c)
d)

60) Which of the following ions in acidic solution is not precipitated by H2S?
a)
b)
c)
d)

61) Which of the following can act as both oxidising and reducing agent?
a)
b)
c)
d) SO

62) An oxy-acid of S not having a +6 oxidation state is
a)
b)
c)
d)

63) In which of the following reactions does SO2 act as an oxidising agent?
a)
b)
c)
d)

64) Ozone is soluble in
a) Kerosene oil
b) Water
c)
d) Turpentine oil

65) The commercial name for per-oxydisulphuric acid is
a)
b)
c) Sulphuric acid crystals
d) Sulphurous acid

66) All the three atoms of ozone are used up when it reacts with
a) PbS
b)
c) KI
d)

67) In which of the following molecules and ions does sulphur not exhibit its maximum oxidation state?
a)
b)
c)
d)

68) Oxygen is divalent, whereas sulphur exhibits valencies of 2, 4 and 6 due to
a) S being a bigger atom
b) the higher Ionisation potential of sulphur
c) S being less electronegative than O
d) the presence of d-orbitals in S

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

70) Sulphur forms the chlorides S2Cl2 and SCl2. The equivalent mass of sulphur in SCl2 is 16 gm/mole. Therefore the equivalent mass of sulphur in is.
a) 32 gm/mole
b) 16 gm/mole
c) 64 gm/mole
d) 8 gm/mole

71) A certain compound when burned gave three oxides. The first turned lime water milky, the second turned cobalt chloride paper pink and the third formed an aqueous solution of pH 3 nearly. The elements present in the compound are
a) C, S, O
b) C, H, Na
c) C, H, S
d) C, H, Ca

72) Sulphuric acid when heated with sulphur powder gives
a)
b)
c)
d)

73) Which one of the following chars when warmed with conc. H2SO4?
a) Protein
b) Fat
c) Hydrocarbon
d) Carbohydrate

74) Which of these solutions turns green when SO2 is passed over it?
a)
b)
c)
d)

75) Which of the following is incorrect about H2SO4?
a) It can act as an oxidizing agent with copper
b) It acts as a dehydrating agent with sugar
c)
d)

76) Oxygen is paramagnetic. The lone pair of electrons is present in the
a) Antibonding orbitals
b) Bonding orbitals
c) p-orbitals
d) f-orbitals

77) The elements S, Se, Te can have two positive oxidation states. Which one of the following is correct?
a) + 4 and + 6
b) +2 and +4
c) +4 and + 8
d) + 2 and + 6

78) The anhydride of H2SO4 is
a)
b)
c)
d)

79) Conc. H2SO4 is always added to water and never the reverse, because
a) The mixture decreases the volume
b) There is less heat evolved per gm mole of the acid
c) They mix more thoroughly the first way
d) The acid splashes out in the second case

80) The number of hydroxy groups present in pyrosulphuric acid is
a) 3
b) 4
c) 2
d) 1

81) Carbon is formed when conc. H2SO4 is added to
a) Formic acid
b) Sugar
c) Oxalic acid
d) Ethyl alcohol

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

83) Oxygen is not evolved when ozone reacts with
a) KI
b) Hg
c)
d)

84) SO2 is dehydrated by
a) CaO
b)
c)
d)

85) The increasing order of acidic strength of given oxides is
a)
b)
c)
d)

86) Platinised asbestos is used as a catalyst in the manufacture of H2SO4. It is an example of a/ an
a) Heterogenous catalyst
b) Auto catalyst
c) Homogeneous catalyst
d) Induced catalyst

87) Ozone can be detected using
a) Ag
b) Hg
c) AgCl
d) NaCl

88) Dry bleach is done by
a)
b)
c)
d)

89) SO3 is not directly absorbed in water because
a) It is soluble in water
b)
c)
d) It forms a stable mist with water

90) Which of the following gases has a slight blue colour in purest form?
a)
b) CO
c)
d)

91) H2SO4 reacts with PCl5 giving SO2Cl2 because H2SO4 is
a) Dibasic
b) Contains 2OH groups
c)
d) Hygroscopic

92) In photography Na2S2O3 is used for
a) Making the latent image visible
b) Intensifying the faint image
c) Dissolving residual AgBr
d) Softening very dark http://www.hourlybook.com/wp-content/uploads/engg-chemistry/Images

93) When H2SO4 is added to charcoal
a) There is no reaction
b) Water gas is formed
c)
d)

94) In the contact process for the manufacture of H2SO4 arsenic impurities are removed by
a)
b) Pb
c)
d)

95) Oxygen and sulphur are alike in that they can
a) Exist in the diatomic state
b) Have atoms of the same size
c) Form covalent hydrides
d) Form covalent compounds with metals

96) When the thiosulphate ion is oxidised by iodine, the ion formed is
a)
b)
c)
d)

97) Which of the following non-metals does not combine with sulphur?
a) Fluorine
b) Hydrogen
c) Phosphorus
d) Iodine

98) Which of the following has the largest radius?
a)
b)
c)
d)

99) Which of the following oxides is most acidic?
a)
b)
c)
d)

100) The weak acid is
a)
b)
c)
d)


Answer

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