P – BLOCK ELEMENTS – 7

1) The lone pair present on VA group elements in their hydrides more easily participates in bond formation in
a)
b)
c)
d) None

2) Which gives a mixture of SO2 and SO3 on heating?
a)
b)
c)
d)

3) The right sequence of acidic character is
a)
b)
c)
d)

4) The bonds present in pernitric acid are
a) Ionic bonds
b) Covalent bonds
c) Semi polar bond or dative bonds
d) Co-ordinate and covalent bonds

5) Red P is prepared from white P by heating it in vacuum to
a)
b)
c)
d)

6) Nitrous acid is slightly blue due to the presence of
a)
b)
c)
d) NO

7) The gas used in Holmes signals is
a)
b)
c)
d)

8) Grahams salt is
a) Sodium aluminosilicate
b) Sodium hexametaphosphate
c) Ferrous ammonium sulphate
d) Potassium chromium sulphate

9) On heating ammonium dichromate the gas evolved is
a)
b)
c)
d)

10) One mole of calcium phosphide on reaction with excess water gives
a) One mole of phosphide
b) Two moles of phosphoric acid
c) Two moles of phosphine
d) One mole of phosphorus pentoxide

11) In the compound of the type ECl3, where E = B, P, As or Bi, the angle Cl-E-Cl for the different E-atoms are in the order
a) B > P = As = Bi
b) B > P > As >Bi
c) B < P = As + Bi
d) B < P < As < Bi

12) Smelling salts are
a)
b)
c)
d)

13) PCl5 is prepared by the action of Cl2 on
a)
b)
c)
d)

14) Antimony burns in chlorine to form
a)
b)
c)
d)

15) PCl5 is kept in a well-stoppered bottle because
a) It is volatile
b) It reacts with oxygen
c) It readily reacts with moisture
d) It is explosive

16) The strongest acid is
a)
b)
c)
d)

17) The arrangement of oxygen atoms around P atoms in P4O10 is
a) Pyramidal
b) Octahedral
c) Tetrahedral
d) Square planar

18) Which is not an acid salt?
a)
b)
c)
d)

19) The gas which is a supporter of combustion is
a)
b)
c)
d)

20) Which of the following is a good conductor of electricity?
a) Yellow P
b) White P
c) Black P
d) Red P

21) Phosphine is not collected in air because
a) It is poisonous
b) It absorbs moisture
c) It catches fire spontaneously in air
d) It is combustible

22) Sulphuric acid reacts with PCI5 and yields
a) Thionyl chloride
b) Sulphuryl chloride
c) Phosphoric acid
d) Sulphur monochloride

23) The strongest oxidising agent is
a)
b)
c)
d)

24) Calcium amm. nitrate (CAN) pellets are coated with calcium silicate because
a) CAN is explosive
b) CAN is hygroscopic
c) CAN is water soluble
d) None

25) NaOH can absorb
a)
b) NO
c)
d) All

26) Which sulphide is insoluble in yellow ammonium sulphide?
a) SnS
b)
c)
d)

27) The catalyst used in the preparation of red P from yellow P is
a)
b) Ni
c) Fe
d) ZnO

28) Hydrolysis of Pl3 yields a
a) Monobasic acid and a salt
b) Monobasic acid and dibasic acid
c) Dibasic acid and tribasic acid
d) Monobasic acid and tribasic acid

29) The number of n bonds in NCl3 is
a) 1
b) 2
c) 3
d) None

30) NCl3 on hydrolysis yields
a)
b) NO, HCl
c)
d)

31) By warming a paste of bleaching powder with a solution of ammonia we get
a)
b)
c)
d)

32) The number of electrons present in the valence shell of P in PCl3 is
a) 8
b) 10
c) 18
d) 12

33) Calcium cyanamide on treatment with steam under pressure gives NH3 and
a)
b)
c)
d) CaO

34) When conc. H2SO4 is added to dry KNO3, brown fumes are evolved. These fumes are of
a)
b)
c)
d)

35) When conc. H2SO4 is distilled with P4O10, the product formed is
a)
b)
c)
d)

36) Nitrous acid reacts with H2SO4 to give
a)
b)
c)
d) None

37) Schweltzers reagent is
a)
b)
c)
d)

38) Conc HNO3 reacts with iodine to form
a) HI
b) HOI
c)
d)

39) Antimony dissolves in aqua regia to give
a)
b)
c)
d)

40) Nitric acid dissolves sulphur to give
a)
b)
c)
d)

41) Phosphoric acid on reaction with sufficient amount of NaOH gives
a)
b)
c)
d)

42) The N2O4 molecule is completely changed into 2 NO2 molecules at
a)
b)
c)
d)

43) P4O10 has short and long P-O bonds. The number of short P-O bonds is
a) 4
b) 3
c) 2
d) 1

44) Select the correct statement:
a) Sodium metal is stored under kerosene
b) One of the oxides of carbon is basic oxide
c) Metals can form only basic oxides
d) To prevent the combination of white P with oxygen, it is kept in kerosene

45) Among the phosphatic fertilizers, super phosphate of lime is a mixture of Ca(H2PO4)2 and
a)
b)
c)
d)

46) HNO3 has the following properties:
a) Oxidising and bleaching
b) Acidic and oxidising
c) Basic and reducing
d) Reducing and bleaching

47) Red and yellow phosphorus are
a) Allotropes
b) Isotopes
c) Isobars
d) Isomers

48) P2O5 is used extensively as a
a) Dehydrating agent
b) Catalytic agent
c) Reducing agent
d) Preservative

49) Which acid is not formed by the action of water on P2O5 ?
a)
b)
c)
d)

50) Which of the following is not a drying or dehydrating agent?
a) Silica gel
b)
c)
d)

51) NO and NO2 are
a) Even electron molecules
b) Odd electron molecules
c) Diamagnetic
d) None

52) Nitric acid oxidises phosphorus to
a)
b)
c)
d)

53) Conc. HNO3 is heated with P2O5 to form
a)
b) NO
c)
d)

54) The hydrolysis of PCl3 produces
a)
b)
c)
d)

55) Phosphorus pentoxide cannot be used to dry
a)
b)
c)
d)

56) NH4Cl is used to clean metal surfaces because
a)
b)
c) NH4Cl forms a volatile chloride
d) None

57) Calcium super phosphate is
a)
b)
c)
d)

58) Labourers working with phosphorus suffer from a disease in which bones decay. It is called
a) Arthritis
b) Phossy Jaw
c) Rickets
d) Cancer

59) NH3 and PH3 resemble each other in their
a) Solubility in water
b) Forming salt with acid
c) Stability
d) Reducing character

60) Which gas can be collected over water?
a)
b)
c)
d) HCl

61) NH3 can be collected by the displacement of
a) Hg
b)
c) NaCl
d)

62) Which halide does not exist?
a)
b)
c)
d)

63) Which halide does not hydrolyse?
a)
b)
c)
d)

64) Which halide of nitrogen is least basic?
a)
b)
c)
d)

65) Sodium nitrate on heating with Zn dust and caustic soda gives
a)
b)
c)
d)

66) The hydroxide of which metal is soluble in excess of ammonia?
a) Cr
b) Cu
c) Fe
d) Bi

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

68) An S-S bond is not present in
a)
b)
c)
d)

69) Over which of the following is oxygen collected?
a) Ethanol
b) Water
c) Mercury
d) Kerosene oil

70) Which of the following is octahedral?
a)
b)
c)
d)

71) Oxalic acid when heated with conc. H2SO4 gives
a)
b)
c)
d)

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

73) Which of the following hydrides has the lowest boiling point?

a)
b)
c)
d)

74) The dipole moments of BF3, H2S and H2O can be arranged as
a)
b)
c)
d)

75) In there are
a) Ionic bonds
b) Covalent bonds
c) Ionic and covalent bonds
d) Ionic, covalent and co-ordinate bonds

76) The molecular formula of sulphur is
a)
b)
c)
d)

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

78) H2S gas was passed through an acidic solution containing Pb2+, Zn2+, Cu2+ and Ni2+ ions. The precipitate will consist of
a) ZnS and PbS
b) PbS and NiS
c) NiS and CuS
d) CuS and PbS

79) Hydrogen bonding is not present in
a) Glycerine
b) Water
c) Hydrogen sulphide
d) Hydrogen fluoride

80) Directed bonds in water form an angle of
a)
b)
c)
d)

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

82) Which of the following ions does not have S-S linkage ?
a)
b)
c)
d)

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

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

85) 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

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

87) 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

88) Which element of the chalcogens has the highest catenation power?
a) S
b) Se
c) Po
d) Te

89) Which is false about oxygen and sulphur?
a) Both can form covalent bonds with metals
b) Both exist in the diatomic state
c) Both can exhibit O.N. of -2 as well as +2
d) Both can form covalent hydrides

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

91) Which of the following trioxides can exist as a monomeric molecule?
a)
b)
c)
d)

92) The electrical conductivity of Se is negligible in the dark but it increases on exposure to light. Because of this property it is used in
a) Photoelectric cells
b) Semiconductors
c) High voltage batteries
d) Lasers

93) Oxygen does not form OF6 because
a) It has a small size
b) There are no vacant d-orbitals available
c) It has a high ionisation energy
d) It has large size

94) The first ionisation energies of group 16 elements
a) Fall sharply from oxygen to sulphur and then fall regularly from sulphur to tellurium
b) Fall regularly from oxygen to tellurium
c) Rise regularly from oxygen to tellurium
d) Rise slightly from oxygen to sulphur and then fall regularly from sulphur to tellurium

95) Which of the following does not provide a reason for the anomalous behaviour of oxygen from other members of its family?
a) The atomic size of oxygen is the smallest among the chalcogens
b) Oxygen shows a maximum valency of two
c) Oxygen has no vacant d-orbitals
d) Oxygen exhibits allotropy

96) Ozone is formed by the interaction of water and
a) Potassium chloride
b) Chlorine
c) Potassium fluoride
d) Fluorine

97) A chalcogen combines directly with hydrogen with great difficulty to form a hydride. This chalcogen also burns in air to form a solid polymeric oxide and has the highest electrical resistance amongst metals. The chalcogen is
a) O
b) S
c) Te
d) Se

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

99) PCl5 exists but NCl5 does not because
a) The nitrogen has no vacant d-orbitals
b) The nitrogen atom is much smaller
c) Nitrogen is inert
d) None

100) 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 triangular pyramidal structure. X and Y are
a)
b)
c) NaF and NaCl
d)


Answer

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