P – BLOCK ELEMENTS – 17

1) Which variety of glass is heat resistant?
a) Bottle glass
b) Pyrex glass
c) Flint glass
d) All

2) Borosilicate glass has the special property of being
a) Resistant to heat
b) Tough
c) Transparent
d) Uncrackable

3) A purple colour is imparted to glass by
a) CoO
b)
c)
d)

4) Which variety of glass is used for making optical glass?
a) Sodium glass
b) Flint glass
c) Ground glass
d) Quartz

5) The composition of glass is
a) Silica, lime, NaCl
b)
c) Silica, NaCl
d)

6) The calorific value of water gas is
a)
b)
c)
d) None

7) The calorific value of coal gas is
a)
b)
c)
d)

8) The purest form of carbon is
a) Animal charcoal
b) Sugar charcoal
c) Petroleum coke
d) Lamb black

9) The soot formed by the burning of vegetables rich in carbon is called
a) Carbon black
b) Gas carbon
c) Lamp black
d) Coke

10) Which of the following is not an alternative source of fuel like oil and coal?
a) Solar energy
b) Nuclear fusion
c) Nuclear fission
d) Tidal power

11) The components present in producer gas are
a)
b)
c)
d)

12) the addition of excess NaOH solution to stannous chloride solution gives
a)
b) Graphite and diamond have different configuration
c)
d)

13) The hottest part of the Bunsen flame is
a) Top of the outer zone
b) A little below the tip of the flame
c) Above the inner zone
d) Blue zone

14) The variety of glass used for the preservation of eggs is
a) Safety glass
b) Water glass
c) Bottle glass
d) Jena glass

15) The most reactive form of carbon is
a) Diamond
b) Graphite
c) Coal
d) Charcoal

16) Butter of tin is
a)
b)
c)
d)

17) RRR The incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of
a)
b) CO
c)
d)

18) Animal charcoal is used for the decolourisation of sugar because
a) It oxidises coloured material
b) It reduces coloured material
c) It converts coloured material into colourless material
d) It absorbs coloured material

19) Wood charcoal is used in gas masks because it
a) Is poisonous
b) Is porous
c) Adsorbs gases
d) Liquefies gases

20) CO2 is used for extinguishing fire because
a) It has a relatively high critical temperature
b) In the solid state it is called dry ice
c) It is neither combustible nor a supporter of combustion
d) It is a colourless gas

21) Which of the following forms of carbon is used in the sugar industry?
a) Animal charcoal
b) Sugar charcoal
c) Lamp black
d) Wood charcoal

22) Newly shaped glass articles became brittle when cooled suddenly; therefore, these are cooled slowly. This process is called
a) Temporing
b) Annealing
c) Quenching
d) Galvanising

23) Graphite conducts electricity because of
a) Weak van der Waals forces between layers
b) Covalent bonding between carbon atoms of layers
c) Delocalised electrons in each layer
d)

24) When SnCl2 reacts with HgCl2, the following is formed:
a)
b)
c)
d) None

25) A substance used to impart green colour to glass is
a)
b) CdS
c)
d)

26) Which property is common to diamond and graphite?
a) Electrical conductivity
b) Relative atomic weight
c) Crystal structure
d) Density

27) In graphite, electrons are
a) Localised on each carbon atom
b) Spread out between the sheets
c) Localised on every third carbon atom
d) Present in the anti-bonding orbital

28) On doping Ge with a little In, we get a/an
a) p-type semiconductor
b) n-type semiconductor
c) Insulator
d) Rectifier

29) The hardest substance among the following is
a) Peat
b) Lignite
c) Graphite
d) Anthracite

30) Which of the following is more stable?
a)
b)
c)
d)

31) Which form of carbon is used in making boot polish, printing ink, paint and black varnish?
a) Bone black
b) Gas carbon
c) Lamp black
d) Graphite

32) Which of the following is similar to graphite?
a) BN
b) B
c)
d)

33) The glass having the smallest coefficient of thermal expansion is
a) Sodalime glass
b) Pyrex glass
c) Safety glass
d) Soft glass

34) Which oxide has a three dimensional structure?
a) CO
b)
c)
d)

35) The sesquie oxide of lead is
a) PbO
b)
c)
d)

36) Annealing of glass is done to
a) Make it more brittle
b) Make it opaque
c) prevent it from becoming brittle
d) make it transparent

37) When Sn (IV) chloride is treated with an excess of conc. HCl, the complex [SnCl6]2- is formed. The oxidation state of Sn in the complex is
a) +4
b) +6
c) +2
d) -2

38) Which element does not show a valency of +2?
a) Si
b) Ge
c) Pb
d) Sn

39) Tin reacts with conc. H2SO4 to form
a)
b) Stannous sulphate
c)
d) Stannic sulphate

40) Carbon is soluble in
a) Conc. HCl
b)
c)
d) Dilute HCl

41) When chlorine is passed through molten tin, the product formed is
a)
b)
c)
d)

42) Cane sugar reacts with conc. HNO3 to give
a)
b) Oxalic acid
c)
d)

43) Tin reacts with
a) Hot conc. HCl
b)
c)
d) All

44) Newtons alloy contains
a) Bi, Sn, Pb
b) Bi, Fe, Cr
c) Bi, Sn, Cd
d) Pb, Sn, Cd

45) Which is not correct?
a)
b)
c) GeO2 is weakly acidic
d)

46) Bucky ball or buckminster fullerene is
a) An allotrope of carbon
b) also called C-60
c) a molecule with sp2 hybridisation , resembling a soccer ball
d) All

47) Which of the following is obtained on heating K4[Fe(CN)6] with H2SO4?
a)
b) CO
c)
d)

48) Which of the following is isoelectronic as well as having the same structure as that of N2O ?
a)
b)
c)
d)

49) The molecule which has a pyramidal shape is
a)
b)
c)
d)

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

51) Orthophosphoric acid is
a) Monobasic
b) Dibasic
c) Tribasic
d) Tetrabasic

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

53) The hybridisation of the atomic orbitals of nitrogen in are :
a)
b)
c)
d)

54) Which of the following forms of phosphorus is the most reactive ?
a) Red phosphorus
b) Yellow or white phosphorus
c) Scarlet phosphorus
d) Violet phosphorus

55) Which of the following substances is preserved in water ?
a) Phosphorus
b) Sodium
c) Zinc
d) Iron

56) Nitrogen can be obtained from air by removing
a) Oxygen
b) Hydrogen
c) Carbon dioxide
d) Both (a) and (c)

57) Which of the following combines with Fe(II) ions to form a brown complex ?
a)
b) NO
c)
d)

58) RRR Repeated use of which of the following fertilizers would increase the acidity of the soil ?
a) Urea
b) Potassium nitrate
c) Ammonium sulphate
d) Super phosphate of lime

59) RRR An element (X) forms compounds of the formula XCl3, X2O5 and Ca3X2, but does not form XCl3. Which of the following is the element ?
a) B
b) Al
c) N
d) P

60) There is very little difference in acid strengths in the series H3PO4, H3PO3 and H3PO2 because
a) Phosphorus is not a highly electronegative element
b) The hydrogens in these acids are not all bonded to phosphorus
c) Phosphorus in these acids exists in different oxidation states
d) Phosphorus oxides are less basic

61) PCl3 reacts with water to form
a)
b)
c)
d)

62) Catalytic oxidation of NH3 gives
a) Nitrogen oxide
b) Nitric oxide
c) Dinitrogen pentoxide
d) Nitrogen

63) Sodium pyrophosphate is
a)
b)
c)
d)

64) In the nitrogen family the H-M-H bond angle in the hydrides MH3 gradually becomes closer to 90° on going from N to Sb. This shows that gradually.
a) The basic strength of hydrides increases
b) Almost pure p-orbitals are used for M-H bonding
c) The bond energies of M-H bond increases
d) The bond pairs of electrons comes nearer to the central atom

65) Which oxide of nitrogen is a coloured gas?
a)
b) NO
c)
d)

66) Which of the following is a tetrabasic acid ?
a) Orthophosphoric acid
b) Hydrophosphoric acid
c) Metaphosphoric acid
d) Pyrophosphoric acid

67) The basic character of the hydrides of VA (15) group elements decreases in the order
a)
b)
c)
d)

68) Among the trihalides of nitrogen which one is the most basic?
a)
b)
c)
d)

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

70) Group 15 of the periodic table consists of the N, P, As, Sb and Bi. On passing from N to Bi, the oxides of the elements of general formula M2O3 become
a) Stronger reducing agents
b) More ionic
c) More basic
d) More volatile

71) Which one of the following penta fluorides cannot be formed?
a)
b)
c)
d)

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

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

74) The acid which forms two series of salts is
a)
b)
c)
d)

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

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

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

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

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

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

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

82) A compound of nitrogen which is explosive is
a)
b)
c)
d)

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

84) What is formed when HNO3 is heated ?
a)
b)
c)
d) NO

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

86) The electronic configuration is that of
a) Oxygen
b) Nitrogen
c) Hydrogen
d) Fluorine

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

88) Which one has the maximum basicity ?
a)
b)
c)
d)

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

90) 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

91) 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

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

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

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

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

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

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

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

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

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


Answer

Leave a Reply

Your email address will not be published. Required fields are marked *