D-F Block Elements Transition Elements MCQs – 6

1) Noble metals are soluble in
a)
b) Aqua Regia
c)
d) Water gas

2) The transition elements are more metallic than the representative elements because they have
a) electrons in the d-orbitals
b) Electron pairs in the d-orbitals
c) Availability of d-orbitals for bonding
d) Unpaired electrons in metallic orbitals

3) Variable valency is exhibited by
a) Normal elements
b) Transitional elements
c) Metallic elements
d) Non-metallic elements

4) Potassium manganate (K2MnO4) is formed when
a)
b) Manganese dioxide is fused with potassium hydroxide in air
c) Formaldehyde reacts with potassium permanganate in presence of a strong alkali
d) Potassium permanganate reacts with concentrated sulphuric acid

5) Which one of the following compounds does not decolourise an acidified aqueous solution of KMnO4 ?
a) Sulphur dioxide
b) Ferric chloride
c) Hydrogen peroxide
d) Ferrous sulphate

6) The total number of rare earth elements is
a) 8
b) 32
c) 14
d) 10

7) Actinides
a) Are all synthetic elements
b) Include element 104
c) Have only short lived isotopes
d) Have variable valency

8) Among the lanthanides the one obtained by the synthetic method is
a) Lu
b) Pm
c) Pr
d) Gd

9) One of the following is diamagnetic:
a) Cu
b)
c)
d) All the above

10) Coinage metals show the properties of
a) Typical elements
b) Normal elements
c) Transitional elements
d) Inert elements

11) A non-copper alloy is
a) Solder
b) Brass
c) Bronze
d) Bell metal

12) Finely divided iron combines with CO to give
a)
b)
c)
d)

13) The number of unpaired electrons in Ni2+ is
a) Zero
b) 2
c) 4
d) 8

14) Tempering steel makes it
a) Hard
b) Soft
c) Heavy
d) Brittle

15) Which of the following elements does not belong to the first transition series ?
a) Fe
b) V
c) Ag
d) Cu

16) MnO4 on reduction in an acidic medium forms
a)
b)
c)
d) Mn

17) The colour of CuCr2O7 solution in water is green because
a)
b)
c) Both ions are green
d)

18) Choose the correct statement about transition elements.
a) Transition elements have low melting points
b) Transition elements do not have catalytic activity
c) Transition elements exhibit variable oxidation states
d) Transition elements exhibit the inert pair effect

19) The transition metals have less tendency to form ions due to their
a) High ionisation energy
b) Low heat of hydration of ions
c) High heat of sublimation
d) All of the above

20) Mercury is the only metal which is liquid at 0°C. This is due to its
a) Very high ionisation energy and weak metallic bond
b) Low ionisation potential
c) High atomic weight
d) High vapour pressure

21) Which of the oxides of manganese is amphoteric ?
a)
b)
c)
d) MnO

22) Amongst TiF2-6, CoF3-6, Cu2CI2 and NiCI2-4 (At. Nos. Ti = 22, Co = 27, Cu = 29, Ni = 28). The colourless species are
a)
b)
c)
d)

23) Which of the following compounds gives a red precipitate with AgNO3 ?
a) Kl
b)
c) NaBr
d)

24) The number of unpaired electrons in Fe2+ (Z = 26) is
a) 4
b) 5
c) 6
d) 3

25) The most common lanthanide is
a) Lanthanum
b) Cerium
c) Samarium
d) Plutonium

26) Of the ions Zn2+, Ni2+andCr3+ [At. Nos. —Zn = 30, Ni = 28, Cr = 24]
a)
b) All three are colourless
c) All three are coloured
d)

27) The common oxidation state of scandium, a transition element, is/are [At. No. of Sc = 21]
a) +4
b) +1
c) +2 and +3
d) +4 and +1

28) Which of the following is not correct about transition metals ?
a) Their melting and boiling points are high
b) Their compounds are generally coloured
c) They can form ionic or covalent compounds
d) They do not exhibit variable valency

29) Zn does not show variable valency because of the
a)
b) Inert pair effect
c)
d) Variable valency

30) Which of the following contains the maximum number of unpaired electrons ?
a)
b)
c)
d)

31) The number of moles of K2Cr2O7 reduced by one mole of Sn2+ ions is
a)
b) 3
c)
d) 6

32) The equivalent weight of KMnO4 (formula weight = M) when it is used as an oxidant in a neutral medium is
a) M
b)
c)
d)

33) Horn silver ore dissolves in an excess of sodium cyanide solution forming
a) AgCN
b)
c)
d)

34) A hard and resistant alloy generally used in the tips of the nibs of pens is
a) Os, Ir
b) Pt, Cr
c) V, Fe
d) Fe, Cr

35) The total number of inner transition elements in the periodic table is
a) 10
b) 14
c) 28
d) 30

36) Which of the following has the maximum number of unpaired electrons ?
a)
b)
c)
d)

37) (n – 1)d10ns2 is the general electronic configuration of
a) Fe, Co, Ni
b) Cu, Ag, Au
c) Zn, Cd, Hg
d) Se, Y, La

38) Which of the following does not react with AgCI ?
a)
b)
c)
d)

39) Prussian blue is
a)
b)
c)
d)

40) Which of the following compounds is not coloured ?
a)
b)
c)
d)

41) Which lanthanide is most commonly used ?
a) Lanthanum
b) Nobilum
c) Thorium
d) Cerium

42) Sodium nitroprusside is
a)
b)
c)
d)

43) A compound that is both paramagnetic and coloured is
a)
b)
c)
d)

44) Which of the following compounds is expected to be coloured ?
a)
b)
c)
d) CuCI

45) The metal which does not form coloured compounds is
a) Cr
b) Fe
c) Zn
d) Mn

46) Automobile engine blocks are made up of
a) Stainless steel
b) Ni – Cr steel.
c) Cast iron
d) Wrought iron

47) The number of moles of KMnO4 that will be needed to react with one mole of sulphite ion in acidic medium is
a)
b)
c)
d) 1

48) @ Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is
a)
b)
c) Cr
d)

49) Which of the following elements is responsible for the oxidation of water to O2 in biological processes ?
a) Fe
b) Mg
c) Cu
d) MO

50) The number of moles of KMnO4 that will be needed to react completely with one mole of ferrous oxalate in acidic solution is
a)
b)
c)
d) 1

51) @ The only cations present in a slightly acidic solution are Fe3+, Zn2+ and Cu2+. The reagent that when added in excess to this solution would identify and separate Fe3+ in one step is
a) 2 M HCI
b)
c) 6 M NaOH
d)

52) CrO3 dissolves in aqueous NaOH to give
a)
b)
c)
d)

53) The electronic configuration of gadolinium (At. No. 64) is
a)
b)
c)
d)

54) Which of the following ions is coloured ?
a)
b)
c)
d)

55) The oxidation state of Mo in Mo2Cl is
a) +4
b) -4
c) +l
d) +2

56) The addition of high proportions of manganese makes steel useful in making rails of rail roads because manganese
a) Gives hardness to steel
b) Helps the formation of oxides of iron
c) Can remove oxygen and sulphur
d) Can show the highest oxidation state of +7

57) The maximum value of magnetic moment is found associated with the configuration
a)
b)
c)
d)

58) Steel that resists acids is
a) Carbon steel
b) Molybdenum steel
c) Stainless steel
d) Nickel alloy steel

59) The first element in the 3d-transition series is
a) Sc
b) Ti
c) V
d) Ca

60) Which of the following oxides of Cr is amphoteric ?
a) CrO
b)
c)
d)

61) In the dichromate dianion
a) 4 Cr—O bonds are equivalent
b) 6 Cr—O bonds are equivalent
c) All Cr—O bonds are equivalent
d) All Cr—O bonds are non-equivalent

62) On heating ammonium dichromate, the gas evolved is
a) Oxygen
b) Ammonia
c) Nitrous oxide
d) Nitrogen

63) Which of the following configurations is correct for iron ?
a)
b)
c)
d)

64) Which of the following is used in the preparation of chlorine ?
a)
b)
c)
d)

65) Which of the following has more unpaired d- electrons ?
a)
b)
c)
d)

66) The configuration of a Cr atom in the ground state is
a)
b)
c)
d)

67) Which of the following is not a property of the transition elements ?
a) Colour
b) Paramagnetism
c) Fixed valency
d) None of these

68) Which of the following ions is colourless ?
a)
b)
c)
d)

69) One of the products formed due to the reaction between KMnO4 and HCI is
a) a red liquid
b)
c) a greenish yellow gas
d)

70) An acidified solution of chromic acid on treatment with H2O2 gives a blue colour which is due to
a)
b)
c)
d)

71) The formation of an interstitial compound makes the transition metal
a) More soft
b) More ductile
c) More metallic
d) More hard

72) The elements which exhibit both vertical and horizontal similarities are
a) Inert gas elements
b) Representative elements
c) Rare elements
d) Transition elements

73) Which of the following is ionic in nature ?
a) CuF2
b)
c)
d) None of these

74) The oxidation state of osmium (Os) in OsC4 is
a) + 4
b) +6
c) + 7
d) +8

75) CuSO4 reacts with KCN solution and forms
a) Cu(CN)
b)
c)
d)

76) Which of the following transition elements shows the highest oxidation state ?
a) Mn
b) Fe
c) V
d) Cr

77) Which oxide of manganese is amphoteric ?
a) MnO
b)
c)
d)

78) The number of unpaired electrons in Mn2+ is
a) 5
b) 4
c) 3
d) 2

79) When Kl and CuSO4 solutions are mixed, they give
a)
b)
c)
d)

80) If KMnO4 is reduced by oxalic acid in an acidic medium, the oxidation number of Mn changes from
a) 4 to 2
b) 6 to 4
c) + 7 to + 2
d) 7 to 4

81) Stainless steel contains iron and
a) Cr
b) Cr + Zn
c) Zn + Pb
d) Cr + Ni

82) The purp|e colour of [Ti(H2O)6]3+ ion is due to the
a) Unpaired d-electron
b) Transfer of an electron
c) Intermolecular vibrations
d) Presence of water molecules

83) Amongst the following, identify the species with an atom in the + 6 oxidation state:
a)
b)
c)
d)

84) The number of unpaired electrons in Fe3+ (Z = 26) is
a) 5
b) 6
c) 3
d) 4

85) In Nesslers reagent, the ion present is
a)
b)
c)
d)

86) A cuprous ion is colourless while a cupric ion is coloured because
a) Both have half filled p- and d-orbitals
b) The cuprous ion has an incomplete d-orbital and the cupric ion has a complete d-orbital
c) Both have unpaired electrons in the d-orbitals
d) The cuprous ion has a complete d-orbital and the cupric ion has an incomplete d-orbital

87) Which of the following is paramagnetic ?
a)
b)
c)
d)

88) The number of moles of K2Cr2O7 reduced by one mole of Sn2+ is
a) 1/6
b) 1/3
c) 2/3
d) 1

89) In Cu (Z = 29)
a) 13 Electrons have spin in one direction and 16 electrons in the other direction
b) 14 Electrons have spin in one direction and 15 electrons in the other direction
c) All the electrons have spin in one direction
d) None of these

90) The oxidation number of iron in Fe3O4 is
a) +2
b) + 3
c) 8/3
d) 2/3

91) Soft and pliable steel is obtained by
a) Tempering
b) Nitriding
c) Annealing
d) None

92) What is the shape of Fe(CO)5 molecule ?
a) Tetrahedral
b) Octahedral
c) Trigonal bipyramidal
d) Square pyramidal

93) Which of the following exhibits the highest oxidation state ?
a) Sc
b) Fe
c) Zn
d) Mn

94) Which of the following gives a blood red colour with KCNS ?
a)
b)
c)
d)

95) In the Ziegler-Natta polymerisation of ethylene, the active species is
a)
b)
c)
d)

96) The valence shell of transition elements consists of
a) nd orbitals
b) (n—1) d orbitals
c) ns, np and nd orbitals
d) (n—1)d and ns Orbitals

97) The mercurous ion is represented as
a)
b)
c)
d)

98) The number of equivalents of Na2S2O3 required for the volumetric estimation of one equivalent of Cu2+is
a) 1
b) 2
c) 3/2
d) 3

99) The number of unpaired electrons in a nickel atom (ground state) are (At. No. of Ni = 28)
a) 2
b) 5
c) 3
d) 7

100) Which form of iron is least ductile ?
a) Hard steel
b) Cast iron
c) Mild steel
d) Wrought iron


Answer

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