P – BLOCK ELEMENTS – 16

1) The melting point is highest in the case of.
a) Pb
b) Si
c) Sn
d) C

2) Thermodynamically the most stable form of carbon is
a) Diamond
b) Charcoal
c) Graphite
d) All are correct

3) Lead is most readily soluble in.
a) Acetic acid
b) Sulphuric acid
c) Carbonic acid
d) Hydrochloric acid

4) The chemical name of phosgene is
a) Phosphine
b) Carbonyl chloride
c) Phosphorus oxychloride
d) Phosphorus trichloride

5) Which is the correct order of decreasing ionic character?
a)
b)
c)
d)

6) Which of the following oxidation states is not shown by carbon in its compounds?
a) +4
b) -4
c) +1
d) 0

7) Which has the highest boiling point?
a) Diamond
b) Graphite
c) Charcoal
d) Lamp black

8) In silicates, silicon is
a) sp-hybridised
b)
c)
d)

9) Which of the following types of forces bind together the carbon atoms in diamond?
a) Ionic
b) Covalent
c) Dipolar
d) Vander Waals

10) In H2SiF6 the covalency of Si is
a) 2
b) 4
c) 6
d) 8

11) The elements of IV group have 4 electrons in their outermost orbit (covalency shell). They
a)
b)
c) Exhibit oxidation states of +4 and +2
d) Exhibit oxidation state of +4

12) Which of the following has the largest atomic radius?
a) Pb
b) Ge
c) Sn
d) Si

13) Which of the following is not an acid anhydride?
a) CO
b)
c)
d)

14) Pb shows the oxidation states
a) +3, +4
b) +1, +2
c) +2, +4
d) +4

15) The unique ability of carbon to form C = C, C º C, C=S, C º N bonds is due to its ability to form
a)
b)
c)
d) None of these

16) PbO2 is
a) Acidic
b) Basic
c) Neutral
d) Amphoteric

17) the density of … is highest:
a) Pb
b) C
c) Si
d) Ge

18) The ability of a substance to assume two or more crystalline structures is called
a) Isomerism
b) Polymorphism
c) Isomorphism
d) Amorphism

19) The gas which shows the maximum deviation from ideal behaviour is
a)
b)
c) He
d)

20) The number of electrons in the nucleus of C12 is
a) 6
b) 12
c) 0
d) 3

21) The property of catenation is strongest in
a) C
b) Si
c) Sn
d) Pb

22) Which is not the property of diamond?
a) It is insoluble in all solvents
b) It is an isomer of graphite
c) It is purest form of carbon
d)

23) Plumbo-solvency means the dissolution of lead in
a) Hot water
b) Acids
c) Ordinary water
d) Alkalies

24) Carbon reacts with conc. H2SO4 to give
a)
b)
c)
d)

25) The material used in solar cells is
a) Cs
b) Si
c) Sn
d) Ti

26) When CO is heated with NaOH under pressure, we get
a) Sodium benzoate
b) Sodium acetate
c) Sodium formate
d) Sodium oxalate

27) The most ionic among the following is
a)
b)
c)
d)

28) CO is poisonous because of its ability to form
a)
b)
c) Carboxy haemoglobin with the iron present in haemoglobin of the blood
d) None of these

29) Artificial carborundum is
a) Silicon carbide
b) Boron nitride
c) Quartz
d) Calcium carbide

30) Tungsten carbide is
a) One of the hardest substances known
b) An interstitial compound
c) A Bertholloid compound
d) All the above

31) The compound of lead used in the match industry is
a) PbO
b)
c)
d) None

32) Lead is not affected by dilute HCl in cold, because
a) Pb is less electronegative than H
b) PbO film is formed which resists chemical attack by acid
c)
d)

33) When sugar is treated with conc. H2SO4, we get a pure form of
a) Carbon
b) Hydrogen
c) Oxygen
d) None

34) Tin cry refers to
a) the conversion of white to grey tin
b) Tin plating
c) the conversion of white tetrahedral tin to white rhombohedral tin
d) the emission of sound while bending a tin rod

35) The carbon atoms in diamond are bonded to each other in a configuration which is
a) Planar
b) Linear
c) Tetrahedral
d) Octahedral

36) Which of the following is not correct?
a)
b) Silanes are good reducing agents
c) Metal fires are put off either by sand or pyrene extinguishers
d) All are correct

37) The name aquadag is associated with
a) Some kind of polymer
b) A colloidal solution of graphite in water
c) A colloidal solution of graphite in oil
d) None of these

38) Semiwater gas is a mixture of
a)
b)
c)
d)

39) Red lead is
a) Minium
b) Sindoor
c)
d) All are correct

40) RRR Lithopone is a mixture of
a)
b)
c)
d)

41) Of the following which metal is used for making bullets?
a) Pb
b) Fe
c) Zn
d) Cu

42) Graphite is made by heating coke with silica for many hours in
a) a blast furnace
b) a blast of steam under pressure
c) presence of air
d) a high electric arc furnace

43) Which of the following is formed when SiCl4 vapour is passed over hot Mg?
a)
b)
c)
d)

44) For extinguishing fire we use
a) CO
b)
c)
d)

45) White lead is
a)
b)
c)
d)

46) Coal gas is a mixture of
a)
b)
c)
d)

47) The gas evolved when Pb(NO3)2 is heated is
a)
b) NO
c)
d)

48) Water gas is prepared by passing
a) Steam over HCl
b) Air over red hot coke
c) Steam over red hot coke
d) None

49) CO2 is obtained by heating
a)
b)
c)
d) None

50) Catenation is the ability of
a) Atoms to form strong bonds with similar atoms
b) Elements to form giant molecules
c) An element to form multiple bonds
d) An element to form long chains of identical atoms

51) An effective reducing agent and industrial fuel is.
a)
b) CO
c)
d)

52) The composition of golden spangles is
a)
b)
c)
d)

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

54) Which of the following is not an allotrope of carbon?
a) Graphite
b) Diamond
c) Soot
d) Carborundum

55) Lead pipes are not safe for drinking water because
a) Lead forms lead oxide with water
b) Water containing dissolved air attacks lead
c) They are corroded by air
d) They are slowly covered by lead carbonate

56) Which of the following is a good reducing agent?
a) SnO
b)
c)
d) None

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

58) The chloride which is not hydrolysed by water
a)
b)
c)
d)

59) When tin reacts with conc HNO3
a) It is converted into stannous nitrate
b) It is converted into stannic nitrate
c) It is converted into metastannic acid
d) It becomes passive

60) Which oxide is used in Crookes glass to cut off UV rays?
a) BaO
b) BeO
c)
d)

61) RRR In the sale of diamonds the unit of weight is carat. One carat is equal to
a) 100 mg
b) 300 mg
c) 400 mg
d) 200 mg

62) Synthesis gas is a mixture of.
a) Steam + CO
b)
c)
d)

63) Black tin is not purified by
a) Fractional distillation
b) Electro refining
c) Poling
d) Liquation

64) Diamond and graphite are two different forms of the same substance. This is because
a) Diamond is harder than graphite
b)
c) Diamond is precious whereas graphite is not
d) They have different crystal structures

65) Two elements frequently used for making transistors are
a) C and Si
b) Ga and In
c) P and As
d) Si and Ge

66) Which of the following statements is correct?
a)
b)
c)
d)

67) Tin plague is
a) Conversion of stannous salt into stannic salt
b) Conversion of white tin into grey tin
c) Tin plating
d) Emission of sound while bending a tin plate

68) The component present in greater proportion in water gas is
a)
b) CO
c)
d)

69) The refractive index of diamond is highest among solids. Its value is
a) 2.225
b) 3.235
c) 2.15
d) 2.417

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

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

72) Ordinary glass is a mixture of
a)
b)
c)
d)

73) Diamond is hard because
a) It is made up of carbon atoms
b) All the valency electrons of each carbon atom are involved in bonding
c) It is a giant molecule
d) It is colourless

74) RRR The purest form of coal is
a) Anthracite
b) Lignite
c) Peat
d) Bituminous

75) Glass reacts with HF giving
a)
b)
c)
d) NaF

76) Solid CO2 is used as a/ an
a) Poison
b) Fire extinguisher
c) Refrigerant
d) Artificial respirant

77) Which of the following contains lead?
a) Soda glass
b) Potash glass
c) Flint glass
d) Bottle glass

78) The carbon content in lamp black is about
a)
b)
c)
d)

79) A substance has a very large fuel value. 1 g. of its complete combustion will therefore give more
a)
b) Water vapour
c) Calories
d) Ash

80) Which of the following is the raw material in making glass?
a)
b)
c)
d)

81) In graphite two layers of carbon atoms are held together by
a) Covalent bonds
b) van der Waals forces
c) Hydrogen bonds
d) Ionic bonds

82) The softest form of carbon is
a) Graphite
b) Diamond
c) Lampblack
d) Charcoal

83) Which of the following substances is used for making a blue glass?
a) CuO
b)
c)
d) CoO

84) The metallic character of the elements of IV group
a) Decreases from top to bottom
b) Has no significance
c) Does not change
d) Increases from top to bottom

85) Which of the following fuel gases has volume composition 34% CH4 + 48% H2 + 15% O2 + 3% CO?
a) Oil gas
b) Water gas
c) Coal gas
d) Petrol gas

86) Graphite is soft because
a) It has a three dimensional structure
b) It has a layered structure
c) It is black
d) It has low density

87) Glass is dissolved in
a) Aqua regia
b) HF
c)
d)

88) The calorific value of producer gas is low because of a
a)
b) Low percentage of CO
c) High percentage of CO
d)

89) Among the various allotropes of carbon,
a) Diamond is the hardest and graphite is the softest
b) Diamond is the hardest and coke is the softest
c) Diamond is the hardest and lamp black is the softest
d) Coke is the hardest and diamond is the softest

90) The least stable hydride is
a) Methane
b) Plumbane
c) Silane
d) Stannate

91) The total number of electrons in one molecule of CO2 is
a) 22
b) 44
c) 66
d) 88

92) Gobar gas contains
a)
b)
c)
d) All are correct

93) Which of the following is not used as a refrigerant?
a)
b)
c)
d) CO

94) Which of the following is a luminous paint?
a) Barium sulphide
b) Zinc sulphide
c) Silver plated metal
d) Nickel chrome alloy

95) Gaseous fuels are better than liquid and solid fuels because
a) Their calorific value is high
b) They leave no solid residue
c) They can be easily handled
d) All are correct

96) Prussian blue is due to the formation of
a)
b)
c)
d)

97) Paris green is
a) Double salt of copper acetate and copper arsenate
b) Double salt of copper carbonate and copper nitrate
c) Double salt of copper acetate and copper sulphate
d) Double salt of copper nitrate and silver nitrate

98) Which of the following contains cerium oxide?
a) Ground glass
b) Crookes glass
c) Jena glass
d) Pyrex glass

99) Pyrex glass is similar to
a) Jena glass
b) Soda glass
c) Water glass
d) Hard glass

100) Which glass cuts off UV rays?
a) Pyrex glass
b) Crookes glass
c) Jena glass
d) Soda glass


Answer

 

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