P – BLOCK ELEMENTS – 4

1) Which of the following is cyclic phosphate?
a)
b)
c)
d)

2) Which of the following halides is the most acidic?
a)
b)
c)
d)

3) The acid which forms two and only two series of salts is
a)
b)
c)
d)

4) Which of the following has the least covalent P-H bond?
a)
b)
c)
d)

5) Which among the following is the least acidic?
a)
b)
c)
d)

6) The element with the highest ionisation potential is
a) B
b) C
c) N
d) O

7) Which of the following is used as a semiconductor?
a) Cr
b) As
c) Al
d) Bi

8) Which of the following oxyacids of phosphorus is a reducing agent and monobasic?
a)
b)
c)
d)

9) In P4O6 the number of oxygen atoms bonded to each P atom is
a) 1.5
b) 2
c) 3
d) 4

10) Moist ammonia gas is dried over
a)
b)
c) Quick lime
d)

11) A nitrogenous fertilizer having a high nitrogen content is
a)
b)
c)
d)

12) The brown ring test is for
a) Sulphate
b) Halide
c) Sulphide
d) Nitrate

13) The electronic configuration 1s22s22p is of
a) Oxygen
b) Nitrogen
c) Hydrogen
d) Fluorine

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

15) Which one has maximum basicity?
a)
b)
c)
d)

16) When lead nitrate is heated it gives off
a)
b) NO
c)
d)

17) Which of the following tendencies remain unchanged on going down in the nitrogen family (group VA)?
a) Highest oxidation state
b) Non-metallic character
c) Stability of hydrides
d) Physical state

18) The yellow colour often shown by nitric acid can be removed by
a) Boiling the acid
b) Passing ammonia through acid
c) Bubbling air through the warm acid
d) Adding a little Mg powder

19) The correct order for the increasing acidic strength of oxides of nitrogen is
a)
b)
c)
d)

20) The correct order of decreasing acidic strength of the oxyacids of VA group elements is
a)
b)
c)
d)

21) Which of the following has the maximum P-H bonds?
a)
b)
c)
d)

22) Which of the following oxyacid is dibasic and acts as a reducing agent ?
a)
b)
c)
d)

23) Which among the following hydrides is most volatile?
a)
b)
c)
d)

24) Which among the following is most unstable?
a)
b)
c)
d)

25) Which among the following is most poisonous?
a)
b)
c)
d)

26) In compounds of the type POX3, the P atom multiple bond is of the type
a)
b)
c)
d) None of these

27) The change in oxidation state when NH2OH is oxidised to N2O is
a) -l to +1
b) -2to+2
c) +1 to -1
d) -3to+l

28) Which of the following does not show allotropy?
a) N
b) P
c) Bi
d) As

29) Which of the following statements about NO is not correct ?
a) Odd-electron molecule
b) Paramagnetic
c) Very reactive
d) None of the above

30) NO2 is a/an
a)
b)
c)
d)

31) In the reduction of HNO3 to N2O, the number of moles of electrons involved per mole of HNO3 is
a) 8
b) 4
c) 3
d) 6

32) The non combustible hydride among the following is
a)
b)
c)
d)

33) Which of the following does not undergo hydrolysis?
a)
b)
c)
d)

34) Which of the following oxides is neutral?
a)
b)
c)
d)

35) Which of the following hydrides of nitrogen is acidic?
a)
b)
c)
d)

36) Which of the following oxides may form a dimer?
a)
b)
c)
d)

37) Laughing gas is
a) Nitrous oxide
b) Nitric oxide
c) Nitrogen trioxide
d) Nitrogen pentoxide

38) The most basic and most stable hydride is
a)
b)
c)
d)

39) NH3 gas gives a brown precipitate with
a)
b)
c)
d)

40) Which hydride of group VA elements has the smallest bond angle?
a)
b)
c)
d)

41) Laughing gas is prepared by heating
a)
b)
c)
d)

42) Which of the following has the lowest boiling point?
a) Nitrogen
b) Phosphorus
c) Antimony
d) Arsenic

43) The density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen because aerial nitrogen contains
a)
b) Argon
c)
d)

44) Which of the following molecules shows p-p bonding?
a)
b)
c)
d)

45) Which is the anhydride of HNO2?
a) NO
b)
c)
d)

46) Which is not correct for N2O?
a) It is laughing gas
b) It is nitrous oxide
c) It is not a linear molecule
d) It is least reactive of all the oxides of nitrogen

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

48) The chemical used for cooling in refrigeration is
a)
b)
c)
d)

49) In the manufacture of safety matches, we use
a) White P
b) Black P
c) Violet P
d) Red P

50) White phosphorus when boiled with a strong solution of NaOH produces
a) Phosphine
b) Posh acid
c) Phosphorus acid
d) No reaction

51) Which of the following statements are not true for phosphorus?
a) It is non-metal
b) It exists as a tetrahedral molecular solid
c) It is less reactive than nitrogen
d) None

52) Which of the following statement regarding hydrides of V A group elements is not correct?
a) The thermal stability of the hydrides decreases down the group
b) The basic character of the hydrides decreases down the group
c) They are ionic and have planar structure
d) The reducing nature increases down the group

53) Which of the following is basic in nature?
a)
b)
c)
d)

54) White phosphorus contains
a)
b)
c)
d)

55) Which one of the following statements is not correct for nitrogen?
a) It has a small size
b) It is a typical non metal
c) It does not readily react with oxygen
d) d-orbitals are available for bonding

56) The bond angle in the ammonium ion is equal to
a)
b)
c)
d)

57) Rain water sometimes contains NH4NO3 because lightening in the sky causes the air to react and produce oxides of nitrogen and
a)
b)
c)
d) Noble gases

58) The dipole moment is highest for
a)
b)
c)
d)

59) Oxidation of metals by HNO3 does not depend on the
a) Nature of metal
b)
c) Temperature
d) Catalyst

60) Colloidal sulphur is obtained by the action of HNO3 on
a)
b) HgS
c)
d)

61) NH3 has a much higher boiling point than PH3 because
a)
b)
c)
d)

62) In the group NO2+, NO+, NO, NO, which species has the strongest bond and shortest bond distance?
a)
b)
c) NO
d)

63) Bismuth does not form a stable pentahalide due to the
a) High electronegativity
b) Inert pair effect
c) Small size
d) Absence of d-orbitals

64) The oxidation state of +1 for phosphorus is found in
a)
b)
c)
d)

65) Which oxide of nitrogen is used as a catalyst in the lead chamber process for the manufacture of H2SO4?
a) NO
b)
c)
d)

66) Which of the following is not correct about hydrazoic acid ? It
a) Forms salts with bases
b) Is a reducing agent
c)
d) Is NH2 COOH

67) Which of the following gives the M3- ion most readily?
a) P
b) N
c) Sn
d) As

68) Ammonia bottles should be opened after cooling in ice for some time. This is because
a) It brings tears
b) It has a high vapour pressure
c) It is an explosive liquid
d) None

69) The anomalous behaviour of nitrogen is due to its
a) Small size and high electronegativity only
b) Non-availability of d-orbitals in valency shell only
c) Ease of multiple bond formation only
d) All are correct

70) When heated to 800°C, N2O gives
a)
b)
c)
d) None

71) Which of the following is not in the correct order?
a)
b)
c)
d) All are correct

72) Metallic nitrides on hydrolysis with water give
a)
b)
c)
d)

73) Which of the nitrogen oxides is a white solid?
a) NO
b)
c)
d)

74) Which of the following is false?
a)
b)
c)
d)

75) Pearl white is
a) BiOCl
b) SbOCl
c) NOCl
d) AsOCl

76) Aqua fortis is
a)
b)
c)
d)

77) Which of the following is most stable?
a)
b)
c)
d)

78) With excess of Cl2, ammonia gives
a)
b) HCl
c)
d)

79) One of the effects of N2O in humans is:
a) It acts as a stimulant
b) It causes laughing hysteria
c) It deactivates haemoglobin
d) None

80) The yellow colour of HNO3 is due to the presence of
a)
b)
c)
d)

81) In the catalytic oxidation of NH3 an oxide is formed which is used in the manufacture of HNO3. The oxide is
a) NO
b)
c)
d)

82) A substance that has a low kindling point and is stored under water is
a) P
b) S
c) Na
d) C

83) Which of the following shows chemiluminescence?
a) White P
b) Black P
c) Red P
d) None

84) Which statement is false for ozone?
a) It is obtained by silent electric discharge on oxygen
b) It is an endothermic compound
c) It can be obtained by the action of UV rays on oxygen
d) It cannot be regarded as an allotrope of oxygen

85) The composition of a safety match head is
a)
b)
c)
d) None of these

86) Which of the following has maximum complex forming ability with a given metal ion?
a)
b)
c)
d)

87) Hyponitrous acid is
a)
b)
c)
d) None

88) Which of the following forms of phosphorus is most stable?
a) Red P
b) White P
c) Black P
d) All are stable

89) The oxyacid of phosphorus that can reduce AgNO3 to Ag is
a)
b)
c)
d)

90) HPO3 + H2O
a)
b)
c)
d)

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

92) Which of the following is the least malleable and ductile?
a) Au
b) Ag
c) Ni
d) Bi

93) p– p multiple bonds are readily formed in
a) Oxides of nitrogen
b) Oxides of P
c) Oxides of Ag
d) Oxides of Bi

94) The strongest acidic oxide is
a)
b)
c)
d)

95) Nitric acid on standing develops a brownish colour, which may be due to the presence of
a)
b)
c)
d)

96) The molecule with a three electron bond is
a)
b) NO
c)
d)

97) Which of the following is used in smokescreens?
a)
b) HCl
c)
d)

98) Some reasons why NH3 reacts with hydrogen chloride are given below. Pick out the incorrect one.
a)
b)
c)
d)

99) In the Birkland and Eyde process, the temperature of the electric arc is about
a)
b)
c)
d)

100) In H3PO3
a) Each hydrogen atom is attached to oxygen
b) Two hydrogen atoms are attached to oxygen atoms
c) One atom of H is attached to oxygen
d) None is attached


Answer :

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