HYDROGEN MCQs – Part1

1) The maximum number of hydrogen bonds that are formed by a molecule of H2O is
a) 1
b) 2
c) 3
d) 4

2) Which of the following elements can form interstitial hydrides?
a) Pt
b) Pd
c) Ni
d) all these metals

3) The ratio by mass of deuterium and oxygen in heavy water(D2O) is
a) 2:1
b) 1:4
c) 1:8
d) 4:1

4) In salt-like hydrides the oxidation number of hydrogen is
a) 1
b) 0
c) -1
d) -(1/2)

5) The use of H2 as a fuel is limited due to
a) the lack of availability of free H2 in nature
b) difficulty in safe storage and transport
c) its high flammability
d) both (a) and (b)

6) 100- Volume H2O2 means that
a) 1L of H2O2 gives 100mL of O2 at STP
b) 1 mL of H2O2 gives 1 mL of O2 at STP
c) 1 mL of H2O2 gives 10mL of O2 at STP
d) 1mL of H2O2 gives 100mL of O2 at STP

7) The normality of 100- Volume H2O2 is
a) 5.6
b) 11.2
c) 17.8
d) 23.3

8) In the industrial production of Hydrogen, steam reacts with hydrocarbons according to the equation
CnH2n+2 + nH2O ® nCO + H2. The number of moles of hydrogen produced will be

a) n
b) n+1
c) 2n+1
d) 2n+2

9) evolved at STP on complete reaction of 27 g of Aluminium (at.wt 27) with excess of aqueous NaOH would be (in litres)
a) 22.4
b) 44.8
c) 67.2
d) 33.6

10) A colourless gas with a smell of rotten fish is
a)
b)
c)
d)

11) Hydrogen is not obtained when zinc reacts with
a) Cold water
b) Dil. HCI
c)
d) Hot NaOH (20%)

12) The oxidation states exhibited by hydrogen in its various compounds are
a) -1 only
b) Zero only
c) + 1, -1 and zero
d) + 1 only

13) Which of the following terms is not correct for hydrogen?
a) Its molecule is diatomic
b)
c) It is the only species which has no neutrons in the nucleus
d) Heavy water is unstable because hydrogen is substituted by its isotope deuterium

14) The most stable hydride is
a)
b)
c)
d)

15) In aqueous solution, H2 will not reduce
a)
b)
c)
d)

16) Which of the following is a nitric acid anhydride?
a) NO
b)
c)
d)

17) The element whose hydride contains the maximum number of hydrogen atoms is
a) Se
b) O
c) B
d) Si

18) The structure of H2O2 is
a) Planar
b) Non-planar
c) Spherical
d) Linear

19) Hydrogen has a tendency to gain one electron in order to acquire a stable helium configuration. It thus resembles the
a) Alkali metals
b) Noble gases
c) Halogens
d) Alkaline earth metals

20) Water contracts on heating
a)
b)
c) To 273 K
d)

21) H2O2 is concentrated by
a) Steam distillation
b) Fractional distillation
c) Freezing in freezing mixture
d) Distillation under reduced pressure

22) Hydrogen molecules are
a)
b)
c)
d)

23) Nascent hydrogen consists of
a) Hydrogen atoms with excess energy
b) Hydrogen molecules with excess energy
c) Hydrogen ions in excited state
d) Solvated protons

24) In an aqueous solution H2 does not reduce
a)
b)
c)
d)

25) Which does not react with cold water?
a)
b)
c)
d) SiC

26) The best explanation for not placing hydrogen with the group of alkali metals or halogens is that
a) Hydrogen can form compounds with all other elements
b) Hydrogen is a much lighter element than the alkali metals or the halogens
c) The IE of hydrogen is too high for the group of alkali metals but too low for the halogen group
d) None of these

27) The n/p ratio for H is
a) 1
b) 2
c) 3
d) 0

28) Which of the following pairs of molecules have practically the same mass?
a)
b)
c)
d)

29) Temporary hardness of water is due to the presence of
a)
b)
c)
d)

30) Temporary hardness may be removed from water by adding
a)
b)
c)
d) HCI

31) Permanent hardness of water can be removed by adding
a)
b)
c)
d) K

32) Heavy water is made up of
a) Hydrogen and a heavier isotope of oxygen
b) Heavier isotopes of both hydrogen and oxygen
c) Oxygen and a heavier isotope of hydrogen
d) Ordinary hydrogen and oxygen

33) Which of the following is used as a moderator in nuclear reactors ?
a) Ordinary water
b) Heavy water
c) Hard water
d) Hydrogen peroxide

34) Heavy water is manufactured
a) By combination of hydrogen and heavier isotope of oxygen
b) By electrolysis of water containing heavy hydrogen dissolved in it
c) By repeated electrolysis of 3% aqueous solution of NaOH
d) None of the above

35) Deuterium or heavy hydrogen is prepared
a) From ordinary hydrogen in a nuclear reactor
b) From ordinary hydrogen by fractionation
c) By electrolysis of acidulated water
d) By reaction of electropositive elements with ordinary water

36) Deuteroammonia (ND3) can be prepared
a)
b) By the action of heavy water on magnesium nitride
c) By the fractionation of ordinary ammonia
d) None of the above

37) Deionized water is obtained by passing hard water through
a) Zeolite
b) A cation exchanger
c) An anion exchanger
d) Both cation and anion exchangers one after the other

38) When hard water is passed through an ion exchange resin containing RCOOH groups, it becomes free from
a)
b)
c)
d)

39) When H202 is oxidised by a suitable oxidant, one of the products is
a)
b)
c)
d)

40) On an industrial scale, H2O2 is prepared by the auto-oxidation of
a) 2-Ethyl anthroquinol
b) 2-Ethyl anthroquinone
c) 1-Ethyl anthroquinol
d) 1-Ethyl anthroquinone

41) The dihedral angle in gaseous H2O2 is
a)
b)
c) 111.5°.
d)

42) To prepare H2O2 in the laboratory
a)
b)
c)
d)

43) Which among the following compounds has the smallest atomic radius?
a) HF
b) HCl
c) HI
d) HBr

44) Which of the following is true with regard to atomic size?
a) H<f<cl<br<i< font=””>
b) H>F>Cl>Br>I
c) F<br<h<cl<i< font=””>
d) Br<cl<h<f<i< font=””>

45) Of the following hydrides which one has the lowest boiling point?
a)
b)
c)
d)

46) Nuclear isomerism is exhibited by
a) Molecular hydrogen only
b) All diatomic molecules
c) All diatomic molecules having even Z values
d) All diatomic molecules having odd Z values

47) Dihydrogen has
a) Two isotopes and no isomers
b) Three isotopes and two nuclear isomers
c) Three isotopes and two optical isomers
d) Two isotopes and two geometrical isomers

48) The ratio of ortho to para hydrogen in ordinary hydrogen at 300 K is
a) 1 : 3
b) 2 : 3
c) 3 : 3
d) 3 : 1

49) Which of the following statements is not correct?
a) The ratio of ortho to para hydrogen varies with temperature
b) The ratio of ortho and para hydrogen at 300 K and above is 3 :1
c) Pure para hydrogen can be obtained by cooling ordinary hydrogen to about 20 K
d) Pure ortho hydrogen can be obtained by heating ordinary hydrogen above 300 K

50) A deuterium atom
a) Has the same atomic mass as the hydrogen atom
b) Has the same electronic configuration as the hydrogen atom
c) Has the same composition of the nucleus as the hydrogen atom
d) Contains one proton more than a hydrogen atom

51) Which of the following statements concerning protium, deuterium and tritium is not true?
a) They are isotopes of each other
b) They have similar electronic configurations
c) They exist in the nature in the ratio 1:2:3
d) Their atomic masses are in the ratio 1 :2:3

52) The isotope of hydrogen which is radioactive is
a) Tritium
b) Deuterium
c) Para hydrogen
d) Nascent hydrogen

53) In all its properties, hydrogen resembles
a) Alkali metals only
b) Halogens only
c) Both alkali metals and halogens
d) Neither alkali metals nor halogens

54) Hydrogen has three isotopes, the number of possible diatomic molecules will be
a) 3
b) 6
c) 9
d) 12

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

56) When electric current is passed through an ionic hydride in the molten state
a) Hydrogen is liberated at the anode
b) Hydrogen is liberated at the cathode
c) No reaction takes place
d) Hydride ion migrates towards cathode

57) The first ionization energy (KJ mol-1) for H, Li, F, Na has one of the following values 1681,520, 1312,495. Which of these values corresponds to that of hydrogen?
a) 1681
b) 1312
c) 520
d) 495

58) Hydrogen is
a) Electropositive
b) Electronegative
c) Both electropositive as well as electronegative
d) Neither electropositive nor electronegative

59) ln which of the following compounds does hydrogen have an oxidation state of — 1?
a)
b)
c) HCI
d)

60) Hydrogen acts as an oxidising agent in the reaction with
a) Bromine
b) Calcium
c) Nitrogen
d) Sulphur

61) The molecule of ortho hydrogen is distinguished from para hydrogen by
a) Two electrons moving in opposite directions
b) Two electrons moving in the same direction
c) Two protons revolving in opposite directions
d) Two protons revolving in the same direction

62) Acidified KMnO4 solution is discharged when
a)
b) Zn is added to it
c)
d) None of the above

63) Metals like Pt and Pd take up large volumes of hydrogen under special conditions. Hydrogen thus retained by the metal is called
a) Absorbed hydrogen
b) Atomic hydrogen
c) Occluded hydrogen
d) Nascent hydrogen

64) Hydrogen is evolved by the action of dil. HNO3 on
a) Cu
b) Al
c) Mn
d) Fe

65) The number of neutrons in the nucleus of a tritium (,H3) atom is
a) 1
b) 2
c) 3
d) 4

66) Which is the lightest gas?
a) Nitrogen
b) Helium
c) Oxygen
d) Hydrogen

67) The reaction between the following pairs will all produce hydrogen except
a) Cu + HCI
b)
c) Mg + Steam
d) Na + Alcohol

68) The absorption of hydrogen by platinum is known as
a) Hydrogenation
b) Reduction
c) Dehydrogenation
d) Occlusion

69) Water can be tested by
a) Smell
b) Taste
c)
d)

70) Tritium is a radioactive isotope of hydrogen. It emits
a) Neutrons
b)
c)
d)

71) Metals like platinum and palladium can adsorb large volumes of hydrogen under special conditions. Such hydrogen adsorbed by the metal is known as
a) Absorbed hydrogen
b) Occluded hydrogen
c) Reactive hydrogen
d) Atomic hydrogen

72) Hydrogen from HCI can be prepared by
a) Cu
b) P
c) Mg
d) Hg

73) The composition of the nucleus of deuterium is
a) One electron, one proton
b) One proton, one neutron
c) One neutron, one electron
d) Two protons, one electron

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

75) The sum of the number of neutrons and protons in the tritium isotope of hydrogen is
a) 6
b) 5
c) 4
d) 3

76) Hydrogen combines with other elements by
a) Losing an electron
b) Gaining an electron
c) Sharing an electron
d) Losing, gaining or sharing of an electron

77) Which one is not an isotope of hydrogen?
a) Tritium
b) Deuterium
c) Ortho hydrogen
d) None of the above

78) Under what conditions of temperature and pressure will the formation of atomic hydrogen from molecular hydrogen be favoured most ?
a) High temperature and high pressure
b) Low temperature and low pressure
c) High temperature and low pressure
d) Low temperature and high pressure

79) At its melting point ice is lighter than water because
a) Water molecules are more closely packed in the solid state
b) Ice crystals have a hollow hexagonal arrangement of water molecules
c) On melting of ice the water molecule shrinks in size
d) Ice forms mostly heavy water on first melting

80) Which of the following will liberate hydrogen by its reaction with hydrochloric acid?
a) Copper
b) Phosphorus
c) Mercury
d) Magnesium

81) Hydrogen canÂ’t be produced by the action of dil. H2SO4 on
a) Cu
b) Zn
c) Fe
d) Al

82) The metal which gives hydrogen on treatment with acid as well as sodium hydroxide is
a) Fe
b) Zn
c) Cu
d) None of these

83) The property of hydrogen which distinguishes it from alkali metals is
a) Its electropositive character
b) Its affinity for non-metals
c) Its reducing character
d) Its non-metallic character

84) Which cannot displace hydrogen from the compounds?
a) Hg
b) Zn
c) Fe
d) None of these

85) 2 g of aluminium is treated separately with excess of dilute H2SO4 and excess of NaOH. The ratio of the volumes of hydrogen evolved is
a) 2 : 3
b) 1 : 1
c) 2 : 1
d) 1 : 2

86) Which of the following statements is correct?
a) Hydrogen has the same IP as alkali metals
b) Hydrogen has the same electronegativity as halogens
c) It has oxidation number of — 1 and + 1
d) It will not be liberated at the anode

87) The absorption of hydrogen by palladium is called
a) Hydration
b) Reduction
c) Occlusion
d) Hydrogenation

88) When H2O2 is oxidised the product is
a)
b)
c)
d)

89) Acidified solution of K2Cr2O7 on treatment with H2O2 gives
a)
b)
c)
d)

90) Which of the following will not displace hydrogen ?
a) Ba
b) Pb
c) Hg
d) Sn

91) Q@ When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with the solution C, it also produces the same gas B on warming but D can produce B on reaction with dilute H2SO4 at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C, D and are respectively.
a)
b)
c)
d)

92) How many molecules are present in 3.6 g. of water ?
a)
b)
c)
d)

93) Which of the following metals absorb H2?
a) K
b) Al
c) Zn
d) Pd

94) The adsorption of hydrogen by platinum black is called
a) Hydrogenation
b) Reduction
c) Occlusion
d) Hydration

95) Heavy water is used as a
a) Control rod
b) Moderator
c) Fuel
d) Coolant

96) The boiling point of water is exceptionally high, because
a) It has a bent structure
b) It has a high dielectric constant
c) There is association of molecules due to hydrogen bonding
d) It is a covalent molecule

97) Identify the correct statement about H2O2.
a) It acts as reducing agent only
b) It acts both as oxidising and reducing agent
c) It is neither an oxidant not a reductant
d) It acts as oxidising agent only

98) In the ionisation of hydrogen, the energy required is
a) 13.6 eV
b) > 13.6 eV
c) < 13.6 eV
d) 1.5 eV

99) The property of hydrogen which distinguishes it from other alkali metals is
a) Its electropositive character
b) Its affinity for non-metals
c) Its reducing character
d) Its non-metallic character

100) Which of the following statements is correct ?
a) Hydrogen has the same IP as alkali metals
b) H has the same electronegativity as halogens
c) H has the oxidation numbers -1 and +1
d) It will not be liberated at the anode


Answers

 

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