HYDROGEN MCQs – 3

1) Hydrogen combines with other elements by
a) Losing an electron
b) Gaining an electron
c) Sharing an electron
d) All are correct

2) The decomposition of hydrogen peroxide 2H2O2 ® 2H2O + O2 is a
a) Zero order reaction
b) First order reaction
c) Second order reaction
d) Third order reaction

3) Hydrogen will not reduce
a) Heated cupric oxide
b) Heated ferric oxide
c) Heated stannic oxide
d) Heated aluminium oxide

4) One of the most important uses of H2O2 is
a) In dyes
b) In creams
c) In plant nutrition
d) in rocket fuels

5) If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be
a) 2 and 1
b) 3 and 1
c) 1 and 1
d) 1 and 3

6) Decomposition of H2O2 is accompanied by
a) Decrease in free energy
b) Increase in free energy
c) No change in free energy
d) Evolution of heat

7) H2O2 restores the colour of old lead paints, blackened by the action of H2S gas, by
a)
b)
c)
d)

8) Which of the following statements is most appropriate in the case of hydrogen?
a) It can act as a reducing agent only
b) It can act as an oxidising agent only
c) It can act as both oxidising and reducing agent
d) It can neither act as an oxidising nor as a reducing agent

9) Strength of 2N H2O2 solution is approximately
a) 10 volumes
b) 11.2 volumes
c) 22.4 volumes
d) 1.12 Volumes

10) The action of steam on heated iron is represented as
a)
b)
c)
d)

11) Industrial hydrogen is prepared by passing an electric current through a solution of
a) NaOH
b)
c)
d)

12) Which of the following statements is wrong?
a) Ordinary hydrogen is an equilibrium mixture of ortho and para hydrogen
b) In ortho hydrogen, the spin of the two nuclei is in the same direction
c) Ortho and para forms do not resemble each other in their chemical properties
d) In para hydrogen, the spin of the two nuclei is in opposite directions

13) The ionisation energy of hydrogen is
a) Equal to that of chlorine
b) Smaller than that of chlorine
c) Slightly higher than that of chlorine
d) Much higher than that of chlorine

14) The number of moles of H2 in 0.224 litre of Hydrogen gas at STP (273K 1 atm.) is
a) 1
b) 0.1
c) 0.01
d) 0.001

15) H2O has a higher boiling point than H2S because
a)
b)
c)
d)

16) Hydrogen cannot be obtained by
a)
b)
c)
d)

17) Pure nascent hydrogen is best obtained by
a)
b)
c) Al and NaOH
d) All of these

18) Which of the following halogens has maximum affinity for hydrogen?
a)
b)
c)
d)

19) Hydrogen acts as an oxidising agent in
a)
b)
c)
d)

20) A 10 volume solution of H2O2 means
a)
b)
c)
d)

21) An oxide that gives H2O2 on treatment with dilute H2SO4 is
a)
b)
c)
d)

22) The radius of a hydrogen atom in the ground state is . The radius of a Li2+ ion (atomic number = 3) in a similar state is
a)
b)
c)
d)

23) Decomposition of H2O2 is accelerated by
a) Traces of acids
b) Finely divided metals
c) Acetanilide
d) Alcohol

24) Calculate the normality of 10 volume H2O2
a) 0.178 (N)
b) 12 (N)
c) 30.3 (N)
d) 0.0303 (N)

25) The last molecule of H2O is evolved from H2O2 by
a) Crystallisation
b) Evaporation
c) Distillation under reduced pressure
d) Electrolysis

26) Which of the following statements is not correct for hydrogen?
a) Its molecule is diatomic
b)
c) It resembles alkali metals and halogens in its properties
d) Heavy water is unstable because hydrogen is substituted by its isotope deuterium

27) Hard water does not give good lather with soap, because soap is precipitated as
a) Magnesium and calcium stearates
b) Calcium and magnesium carbonates
c) Hydroxides of calcium and magnesium
d) None is correct

28) Crystals of washing soda lose nine molecules of water when exposed to dry air. This phenomenon is known as
a) Dehydration
b) Deliquescence
c) Efflorescence
d) Evaporation

29) On an industrial scale, hydrogen peroxide is now generally prepared by
a)
b)
c)
d) Burning hydrogen in excess of oxygen

30) Hydrogen peroxide cannot be concentrated easily because
a) It is highly volatile in nature
b) It is not miscible with water
c) It decomposes at its boiling point
d) It has a very high boiling point

31) The H— O— O bond angle in H2O2 is
a)
b)
c)
d)

32) The correct increasing order of acidity of CO2, H2O and H2O2 is
a)
b)
c)
d)

33) In which of the following equations does H2O2 act as a reducing agent in acidic medium?
a)
b)
c)
d)

34) In acidic medium, H2O2 acts as a reducing agent in its reaction with
a)
b)
c)
d)

35) In basic medium, H2O2 acts as an oxidising agent in its reactions with
a)
b)
c)
d)

36) The decomposition of H202 can be checked by the addition of
a) Akali metal oxides
b) Benzene
c) Acetanilide
d)

37) Which of the following reactions depicts the reducing action of H2O2?
a)
b)
c)
d)

38) Which one of the following reactions demonstrates that H2O2 acts as an oxidising agent in the basic medium?
a)
b)
c)
d)

39) When hydrogen peroxide is treated with a cold acidified K2Cr2O7 solution containing ether, a blue colour is obtained. This is due to
a) Chromium sulphate
b) Potassium chromate
c) Perchromic acid
d) Chromium trioxide

40) What would happen when a small quantity of H2O2 is added to a solution of FeSO4?
a)
b)
c)
d)

41) 100 cm3 of a given sample of H2O2 gives 1000 cm3 of O2 at S.T. P. The given sample is
a)
b)
c)
d)

42) A dilute solution of H2O2 is labelled as 20 volume. Its percentage strength is
a)
b)
c)
d)

43) The normality of 30 volume H2O2 solution is
a) 3.57
b) 7. 53
c) 5.36
d) 5. 73

44) A sample of H2O2 is labelled as 10 volume. Its strength in gram/litre is
a) 30.35
b) 60.7
c) 15.17
d) 45.42

45) Which of the following compounds turns white on treatment with H2O2?
a) HgS
b) PbS
c) NiS
d) CuS

46) The reaction Ag2O + H2O2 ® 2 Ag + H20 + O2 takes place in
a) Basic medium
b) Acidic medium
c) Neutral medium
d) Both acidic and basic medium

47) H2O2 is used as
a) Antiseptic
b) Bleaching agent
c) Propellent
d) All

48) One of the following is an incorrect statement, point it out.
a) Permanent hardness can be removed by boiling water
b) Hardness of water affects soap consumption
c) Temporary hardness is due to bicarbonates of Ca and Mg
d)

49) Heavy water is called heavy because it
a) Is denser than common water
b) Is an oxide of deuterium
c) Has a heavy or bad taste
d) Has a heavier isotope of oxygen

50) The melting point of most solid substances increases with an increase of pressure acting on them. However, ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because
a) Pressure generates heat
b) The chemical bonds break under pressure
c) Ice is less denser than water
d) Ice is not a true solid

51) Water boils and freezes exactly at 100°C and 0°C respectively; find the reason for it from the following
a) Water dissolves anything however sparingly the dissolution may be
b) Water is a polar molecule
c) The boiling and freezing temperatures of water were used to define temperature scales
d) Liquid water is denser than ice

52) A variety of water which contains soluble salts of Ca and Mg is known as
a) Heavy water
b) Soft water
c) Hard water
d) Conductivity water

53) To test whether a given clear liquid is water; of the following methods, the best one could be
a) Smell the liquids
b) Add anhydrous copper sulphate and look for a colour change
c) Taste the liquid
d) Moisten litmus paper with the solution

54) The oxide that gives H2O2 on treatment with dilute acid is
a)
b)
c)
d)

55) Hydrogen peroxide is used as
a) A bleaching agent
b) An oxidising agent
c) An oxidant in rocket fuel
d) All of the above

56) RRR On an industrial scale, H2O2 is now generally prepared by
a)
b)
c)
d)

57) Heavy water is
a)
b) Water obtained by repeated distillation
c)
d)

58) The reaction H2S +H2O2 S+2H2O manifests the
a)
b)
c)
d)

59) The reaction of H2O2 with sulphur is an example of a/an ….. reaction
a) Addition
b) Oxidation
c) Reduction
d) Acidic

60) H2O2 acts as an oxidising agent in
a) Neutral medium
b) Acidic medium
c) Alkaline medium
d) Acidic as well as alkaline medium

61) Which of the following statements is incorrect ?
a)
b)
c)
d)

62) H2O22H++O2 + 2e- ; E° =-0.68 V. The above equation represents which of the following properties of H2O2 ?
a) Reducing
b) Oxidising
c) Acidic
d) Cataiytic

63) Which one of the following removes temporary hardness of water?
a) Slaked lime
b) Plaster of Paris
c) Epsom
d) Hydrolith

64) Heavy water is used in nuclear reactors for
a) being the
b) Slowing down the speed of high energy neutrons
c) Transporting heat from the reactor
d) Heating purposes

65) When sulphur trioxide is heated with heavy water the products are
a) Deutero-sulphuric acid
b) Deuterium sulphuric acid
c) Deuterium and sulphuric acid
d) None of the above

66) Of the following which one is a true peroxide?
a) PbO
b)
c)
d) CaO

67) A dilute solution of H2O2 cannot be concentrated by
a) Vacuum distillation
b)
c) Fractional crystallization at lower temperature
d) Careful and slow evaporation in a shallow dish

68) D2O will have maximum density at
a) 9 degree Celsius
b) 11.5 degree Celsius
c) 15.9 degree Celsius
d) 20 degree Celsius

69) The hair dyes available in the market generally contain two bottles, one containing dye and the other hydrogen peroxide. Before applying the dye, the two solutions are mixed. The hydrogen peroxide
a) Is added to dilute the solution of the dye
b) Oxidises the dye to give the desired colour
c) Reduces the dye to give the desired colour
d) Acidifies the solution of the dye

70) Which of the following statements is not correct?
a)
b)
c)
d)

71) Moist hydrogen peroxide cannot be dried over conc. H2SO4 because
a) It can catch fire
b)
c)
d)

72) Decomposition of H2O2 is favoured by
a) Traces of acids
b) Alcohol
c) Acetanilide
d) MnO

73) The maximum possible number of hydrogen bonds a water molecule can form in ice is
a) 1
b) 2
c) 3
d) 4

74) Which pair of ions causes hardness of water?
a)
b)
c)
d)

75) An inorganic substance liberates O2 when heated, turns an acid solution of Kl brown and reduces acidified KMnO4. The substance is
a)
b)
c)
d)

76) 30 volumes of H2O2 means
a)
b)
c)
d)

77) 11.2 volumes of H2O2 is about
a) 3.4%
b) 0.34%
c) 34%
d) 0-34%

78) One of the following is an incorrect statement. Point out the incorrect one
a) Hardness of water depends upon its soap consuming power
b) Temporary hardness is due to the presence of bicarbonates of calcium and magnesium
c) Permanent hardness is caused by soluble sulphates and chlorides of Ca and Mg
d) Permanent hardness can be removed by boiling water

79) In aqueous solution hydrogen peroxide oxidises H2S to
a) Sulphur
b) Sulphuric acid
c)
d)

80) Which of the following groups of ions makes water hard?
a) Sodium and bicarbonate
b) Magnesium and chloride
c) Potassium and sulphate
d) Ammonium and chloride

81) The correct order of the O—O bond length in O2, H2O2 and O3 is
a)
b)
c)
d)

82) Commercial 10 volume H2 O2 is a solution with a strength of approximately
a) 30%
b) 3%
c) 1%
d) 10%

83) The hydride ion H is a stronger base than its hydroxide ion OH. Which of the following reactions will occur if sodium hydride (NaH) is dissolved in water?
a)
b)
c)
d) None of these

84) What is heavy water?
a)
b)
c)
d)

85) The low density of ice compared to water is due to
a) Hydrogen bonding interactions
b) Dipole—dipole interactions
c) Dipole—induced dipole interactions
d) Induced dipole—induced dipole interactions

86) Which among the following has the largest dipole moment?
a) HI
b)
c)
d)

87) The alum used for purifying water is
a) Ferric alum
b) Chrome alum
c) Potash alum
d) Ammonium alum

88) Which of the following metals will not reduce H2O?
a) Ca
b) Fe
c) Cu
d) Li

89) The reaction of potassium with water is
a) Exothermic
b) Endothermic
c) Hydrolysis
d) Absorption

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

91) A metal X on heating in nitrogen gas gives Y. Y on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour. Y is
a)
b)
c)
d) MgO

92) The volume strength of perhydrol is
a) 20
b) 30
c) 100
d) 10

93) Water shows which type of properties?
a) Acidic
b) Basic
c) Oxidising
d) All the above

94) Organic ion exchangers can produce
a) Soft water
b) Deionised water
c) Demineralised water
d) Both (b) and (c)

95) H202 can be prepared by
a)
b)
c)
d) All the above

96) In an aqueous solution hydrogen will not reduce
a) Fe3+

b) Cu2+

c) Zn2+

d) Ag+

97) H2O2 restores the colour of old lead paintings by

a) Oxidizing PbS to PbSO4

b) Reducing PbS to Pb

c) Forming a complex

d) None of these

98) Hydrazoic acid is
a) H2 N2

b) HNO4

c) NH3

d) N3 H

99) The normal pH in the stomach is about
a) 7
b) 5
c) 2
d) -2


Answer

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