D-F Block Elements Transition Elements MCQs – 8

1) Transition elements are frequently used as catalysts, because of their
a) Large ionic charge
b) Large surface area for the reactants to be adsorbed
c) Unpaired d-electrons
d) Both (b) and (c) are correct

2) The element present in the red blood cells of man is
a) Fe
b) Ra
c) Co
d) All

3) Rusting of iron in moist air involves
a) Loss of electrons by Fe
b) Gain of electrons by Fe
c) Neither gain nor loss of electrons
d) Hydration of Fe

4) Paramagnetic compounds are
a) Non-metals
b) Strongly magnetic
c) Weakly magnetic
d) Non-magnetic

5) Which of the following is a ferrous alloy?
a) Solder
b) Invar
c) Type metal
d) Magnalium

6) d-Block elements are arranged in
a) Three series
b) Six series
c) Two series
d) Four series

7) Ferrocene is
a) A cobalt complex
b) A magnesium complex
c) A nickel complex
d) An iron complex

8) Which metal is used generally for the filaments of electric bulbs ?
a) Pt
b) Fe
c) Cu
d) W

9) The second series of transition elements starts with
a) Yttrium
b) Chromium
c) Zinc
d) Scandium

10) d-block elements generally form
a) Covalent hydrides
b) Metallic hydride
c) Interstitial hydrides
d) Salt like hydrides

11) The magnetic property of transition metals is due to the
a) Spin of electrons
b) Orbital moment
c) Both
d) Neither of the two

12) A chromium compound widely used in the tanning of leather is

13) The EAN of nickel in Ni(CO)4 is
a) 36
b) 38
c) 28
d) 54

14) The EAN of nickel in K2[Ni(CN)4] is
a) 35
b) 34
c) 36
d) 38

15) Which of the following oxides of chromium is amphoteric in nature ?
a) CrO
d) None

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

17) The colour of Fe2+ ions is
a) Blue
b) Light green
c) Very dark green
d) Yellow

18) The most stable oxidation state of chromium is
a) +5
b) +3
c) +2
d) +4

19) When an acidified solution of ferrous ammonium sulphate is treated with KMnO4 solution, the ion which is oxidised is

20) @ ALL answers need change The electronic configuration of the fourth transition element is

21) The stability of the ferric ion is due to
a) Completely filled d-orbitals
b) Half filled d-orbitals
c) Half filled f-orbitals
d) Completely filled f-orbitals

22) Which of the following has the highest percentage of carbon ?
a) Stainless steel
b) Pig iron
c) Wrought iron
d) None

23) Metals which are hard and lustrous substances with high melting points, and which form highly coloured compounds, are known as
a) Alkali metals
b) Alkaline earth metals
c) Transition metals
d) None of these

24) Heteropoly acids are formed by
a) Be
b) Fe
c) Mo
d) Cr

25) Negative oxidation states of transition elements are only shown in
a) Halides
b) Sulphides
c) Sulphates
d) Complexes

26) Transition metals in their compounds show
a) Ionic bonds
b) Covalent bonds
c) Ionic and covalent bonds
d) Ionic and co-ordinate bonds

27) Which of the following statements is incorrect about transition element ?
a) All elements form complexes
b) All are paramagnetic
c) All show variable valency
d) All are not coloured ions

28) Which is not amphoteric ?

29) The element with atomic number 23 is placed in the periodic table in the
a) s-block
b) p-block
c) d-block
d) f-block

30) In the first transition series, the incoming electron enters the
a) 5 d-orbital
b) 4 d-orbital
c) 3 d-orbital
d) 2 d-orbital

31) Which is not true in case of transition metals ?
a) They are malleable and ductile
b) They have high melting and boiling points
c) They crystallise with body centered cubic and hexagonal close packed structure only
d) They show variable oxidation states although not always

32) Which of the following is not correct in the case of transition elements ?
a) They have high m.p. and b.p
b) Their compounds are generally coloured
c) They form ionic and covalent compounds
d) They do not show variable valency

33) The 3d transition series contains elements having atomic numbers from
a) 22 to 30
b) 21 to 30
c) 21 to 31
d) 21 to 29

34) Adam’s catalyst is
a) Pt/PtO
b) Pt

35) Transition elements form alloys easily because they have the
a) Same atomic number
b) Same electronic configuration
c) Nearly same atomic size
d) None

36) Transition elements that show an anomalous electronic configuration in the first series are
a) Cr and Ni
b) Cu and Co
c) Fe and Ni
d) Cr and Cu

37) The tendency of the transition metals to form complexes is not explained by the
a) Small size of the metal ion
b) Large ionic or nuclear charge
c) Low basicity of metal ions
d) Non availability of d-orbitals

38) Which is the oxidation state common to the first transition series of elements ?
a) +2
b) +6
c) +8
d) +4

39) Which of the following electronic configurations belong to those of transition elements ?

40) Transition metals are less reactive because of their
a) High ionisation potential and low melting point
b) High ionisation potential and high melting point
c) Low ionisation potential and low melting point
d) Low ionisation potential and high melting point

41) The common oxidation state of scandium (Z =21) is
a) +4
b) +l
c) +2,+3
d) +4,+1

42) Non stoichiometric compounds are formed by
a) Alkali metals only
b) Transition elements only
c) Noble gases only
d) More than one of the above said elements

43) Transition metals fit in the periodic table between the
a) III and IV group
b) I and III group
c) II and III group
d) I and II group

44) All ferromagnetic substances
a) Can be magnetised
b) Can be electrolysed
c) Have completely filled f-orbitals
d) None

45) Which of the following has the largest size ?

46) The standard reduction potential of transition elements is generally
a) Negative
b) Positive
c) Zero
d) May be positive or negative

47) Which of the following has the highest melting point ?
a) Cr
b) Ti
c) Fe
d) Co

48) All d-block elements have a
a) +1 Oxidation state
b) +2 Oxidation state
c) +3 oxidation state
d) Zero oxidation state

49) Like d-block elements, Zn and Cd do not exhibit variable valency, because
a) the d-orbitals are completely filled
b) Thier outer shells contain two electrons each
c) They have low m. p.
d) All are correct

50) An alloy of Co, Ni and Fe used in permanent magnets is
a) Inconel
b) Nichrome
c) Alnico
d) Vaitallium

51) The lightest transition element is
a) Fe
b) Sc
c) Os
d) None

52) Which of the following metals adsorbs hydrogen ?
a) Pd
b) K
c) Al
d) Zn

53) In the reduction of dichromate by Fe (II), the number of electrons involved per chromium atom is
a) 1
b) 4
c) 5
d) 3

54) Which of the following metals has been used in the making of boats because it has resistance to corrosion by sea water?
a) W
b) Cu
c) Ni
d) Ti

55) The densest transition element is
a) Fe
b) Sc
c) Os
d) Mn

56) Aqua regia reacts with Pt to yield

57) The metallic bond is stronger in transition metals than in alkali and alkaline earth metals because of
a) the larger number of electrons including d-electrons
b) Large size of the atoms
c) Paramagnetism
d) Diamagnetism

58) Which of the following series of elements have nearly the same atomic radii?
a) F, Cl, Br, I
b) Na, K, Rb, Cs
c) Li, Be B, C
d) Fe, Co, Ni, Cu

59) The total number of rare earth elements is
a) 32
b) 14
c) 16
d) 8

60) Which of the following is not an interstitial compound ?
a) TiN

61) The most stable ion is

62) The maximum paramagnetism in the 3d series is shown by
a) Mn
b) Co
c) Ni
d) Fe

63) The variable valencies of transition elements are due to the
a) Different energies of (n-1)d electrons
b) Different energies of ns electrons
c) Similar energies of (n-1)d electron
d) Similar energies of (n-1)d and ns electrons

64) The stable oxidation states of Mn are
a) +2, +3
b) +2, +7
c) +3, +7
d) +3 +5

65) Transition elements exhibit positive oxidation states only. This is because of
a) The large size of the atoms
b) Their electropositive nature
c) Their electronegative nature
d) Their paramagnetic nature

66) What is the oxidation state of Fe in sodium nitroprusside ?
a) 0
b) +1
c) +2
d) +3

67) Which of the following has the minimum magnetic moment ?

68) Which of the following elements forms the highest valent oxide ?
a) V
b) Cr
c) Mn
d) Fe

69) The 5f level is successfully filled up in
a) Lanthanides
b) Actinides
c) Rare gases
d) Transition elements

70) The most common oxidation state of lanthanides is
a) +5
b) +3
c) +2
d) +1

71) The number of unpaired electrons in haemoglobin is
a) 0
b) 1
c) 4
d) 5

72) Paramagnetism in the substance increases as
a) The number of paired electrons increases
b) The number of paired electrons increases
c) The number of unpaired electrons decreases
d) The number of paired electrons decreases

73) If the orange colour is absorbed from white light, the observed colour is
a) Yellow
b) Orange
c) Blue
d) Violet

74) The electronic configuration of a transition element is 4s23d3. The possible oxidation states are
a) +1, +2, +3, +4
b) +2, +3
c) +1,+2,+3
d) +2,+3,+4,+5

75) Which of the following transition elements exhibit a +8 oxidation state ?
a) Cu, Zn
b) Ru, Os
c) Ag, Au
d) Cu, Cr

76) If a compound absorbs the violet colour from the light, then the observed colour is
a) Yellow green
b) Orange
c) Blue
d) Green

77) Colour in transition metal compounds is attributed to the
a) Small sized metal ions
b) Absorption of light in the UV region
c) Complete ns subshell
d) Incomplete (n-l)d subshell

78) The oxidation state of Fe in haemoglobin is
a) 0
b) +1
c) +2
d) +3

79) Which of the following is a diamagnetic ion ?

80) The number of unpaired electrons present in a Cr3+ ion is
a) 1
b) 2
c) 3
d) 4

81) The reaction of Cr2O2-7 with alkali produces

82) The principal oxidation states shown by Cr are
a) +2, +3, +4
b) +2, +4, +6
c) +2, +3, +5
d) +2, +3, +6

83) A metal that can form a complex with insulin is
a) Cu
b) Fe
c) Co
d) Zn

84) In a +3 state, the electronic configuration of a transition metal is [Ar]3d4. Its actual electronic configuration is
a) [Ar]3d54s2

85) Cobalt chloride paper provides a test for the presence of
b) CO
c) HCN

86) Ink stains can be removed using
a) Oxalic acid
b) Citric acid
c) Lemon juice
d) All the above

87) The highest oxidation state of a transition element is
a) +8
b) +7
c) +5
d) +1

88) The most abundant transition element is
a) Cr
b) Fe
c) W
d) Mn

89) Pt – Ir alloys are used in making
a) Fountain pen points
b) Chemical laboratory wares
c) Standard weights
d) All the above

90) A clock spring is heated to redness and then plunged into cold water. This treatment will cause it to become
a) Soft and ductile
b) More spongy
c) Strongly magnetic
d) Hard and brittle

91) The correct electronic configuration of Cr (Z =24) is

92) Transition metals, despite a high E°oxidation, are poor reducing agents due to their
a) High heat of vapourization
b) High ionization energies
c) Low heats of hydration
d) All of these

93) The existence of the Cu+ ion in aqueous solution is very rare owing to its
a) Oxidation
b) Reduction
c) Disproportionation
d) Instability

94) An ion of a transition metal has a magnetic moment of 1.73 B.M. It could be

95) The +4 oxidation state is stable for
a) Ni
b) Pt
c) V
d) Cr

96) [email protected] Which element of the 1st transition series has the lowest oxidation potential value M (s) ® M2+ (aq) + 2e ?
a) Mn
b) Fe
c) Ni
d) Co

97) Manganese steel contains
a) Fe + C + Mn
b) Fe + C + Al
c) Fe + Mn
d) Fe + Mn + Cr

98) Wilsons disease
a) Is a hereditary storage of ceruloplasmin
b) Causes Cu accumulation in the liver, brain
c) Is cured by treating the patient with EDTA
d) All of these are correct

99) Which of the following ions forms the most stable complex compound ?

100) d-block elements show variable oxidation states because the difference in energy between
a) ns and nd orbitals is very slight
b) ns and (n – 1) d orbitals is very slight
c) ns and np orbitals is large
d) np and (n – 1) d orbitals is small


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