D-F Block Elements Transition Elements MCQs – 9

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

2) The uncommon oxidation states of Mn are
a) +2, +4, +6
b) +4, +6, +7
c) +1, +3, +5
d) +3, +4, +5

3) Which of the following divalent cations has the largest number of unpaired electrons ?

4) Which of the ions having the following electronic structure would have the maximum magnetic moment?

5) Which is used in filling cavities in teeth ?
a) Cu(Hg)
b) Ag(Hg)
c) Zn (Hg)
d) Ni (Hg)

6) Choose the correct answer:
a) Transition elements have low m.p.
b) Transition elements do not have catalytic activity
c) Transition elements exhibit variable oxidation states
d) Transition elements show the inert pair effect

7) The transition metals have less tendency to form ions due to their
a) High I.E
b) Low heat of hydration of ion
c) High heat of sublimation
d) All of these

8) Two stable ions of the first transition series which have the largest number of unpaired electrons and have the highest magnetic moment are

9) Two stable ions of the 1st transition series which are diamagnetic are

10) Stainless steel contains
a) 50% Cr
b) 2.5% Cr
c) 14% Cr
d) 2% Cr

11) Vitamin BI2 contains cobalt in the state
a) +2
b) +3
c) +1
d) 0

12) The electronic configuration 1s22s22p63s2 3p63d6 corresponds to
c) Co
d) Ge

13) Which of the following has the lowest melting point ?
a) Ti
b) Zn
c) Fe
d) V

14) In K4Fe(CN)6, Fe is present
a) As a cation
b) As an anion
c) As a free ion
d) In a neutral complex

15) In the periodic table, transition elements are present
a) Towards the left
b) Towards the right
c) In the middle
d) Under the table

16) The magnetic moment of a transition metal ion is 2.83 BM. The number of unpaired electrons present in this ion is
a) 1
b) 2
c) 3
d) 4

17) A paramagnetic substance in a magnetic field experiences
a) a loss in weight
b) an increase in weight
c) No change in weight
d) None

18) In the metal carbonyls of the general formula M(CO)x, where M= metal and x= 4, the metal is bonded to
a) Oxygen
b) Carbon
c) Oxygen
d) C = O bond

19) The effective atomic number of Cr (Z = 24) in [Cr(NH3)6]Cl3 is
a) 35
b) 27
c) 33
d) 36

20) Which of these elements have almost the same atomic radius ?
a) Fe, Co, Ni
b) Na, K, Rb
c) Li, Be, B
d) F, Cl, Br

21) In lanthanides, the ionic radius of M3+ from La to Lu
a) Increases
b) Decreases
c) Remains almost constant
d) First increases and then decreases

22) Which of the following ions has the minimum ionic radius ?

23) In the 3d-series, the atomic radii of elements
a) Decrease from Sc to Zn
b) Increase from Sc to Zn
c) Decrease from Sc to Ni and then increase
d) Increase from Sc to Ni and then decrease

24) In the 3d-series, the ionisation energy is minimum in the case of
a) Zn
b) Ni
c) Sc
d) V

25) The number of transition elements known is
a) 20
b) 42
c) 61
d) 35

26) Transition elements are hard, because of their
a) Covalent bonds
b) Ionic bonds
c) Hydrogen bonds
d) Co-ordinate bond

27) The second ionisation energy of Cr is greater than the neighbouring elements because of
a) More paired electrons
b) Half filled d-orbitals
c) Half filled s-orbitals
d) Unpaired s-electron

28) The passivity of iron in conc. HNO3 is due to the
a) Ferric nitrate coating of the metal
b) Ammonium nitrate coating on the metal
c) thin oxide layer on the metal
d) hydride coating on the metal

29) The transition element which exhibits the highest oxidation state has the electronic configuration

30) Which of the following is colourless in solution ?

31) In lanthanides the differentiaing electron enters the
a) d-sublevel
b) f-sublevel
c) s-sublevel
d) p-sublevel

32) Fe and Zn are distinguished using
a) Dil. Cl
b) NaOH
c) NaCN

33) d-block elements consist mostly of
a) Monovalent metals
b) All non- metals
c) Elements which generally form stoichiometric metal oxide
d) Many metals with catalytic properties

34) Steel contains
a) 2.5 – 4.5%C
b) 0.5 – 1.5%C
c) 0.12 – 0.25%C
d) 1 – 2%C

35) TlCl has NaCl structure, the coordination number of Tl+ in TlCl is
a) 6
b) 5
c) 4
d) 2

36) An example of a Ferromagnetic oxide is
a) Cr O2
b) Ti O2
c) Fe3 O4
d) Mn2 O7

37) Fool’s gold is related with
a) Ferric sulphide
b) Ferrous sulphide
c) Iron pyrites
d) Iron oxide

38) AgNO3 gives a red ppt with
a) Nal
b) KCl
c) Na2CrO4
d) NaNO3

39) Pig iron usually contains about 4%
a) Fe
b) S
c) C
d) Ca

40) The oxidation of Fe2+ in acid solution produces
a) Fe ( OH )2
b) Fe3+
c) Fe ( OH )3
d) Fe ( OH ) 2 +

41) Ag Cl on fusion with Na2CO3 gives
a) Ag
b) Ag2 CO3
c) Ag2 O
d) Silver carbide

42) The element, which is essential for nitrogen fixation is
a) Zinc
b) Copper
c) Molybdenum
d) Boron

43) Nessler’s reagent contains
a) HgCl2
b) HgO
c) HgSO4
d) HgI4 2-

44) Zinc blende has the formula
a) ZnO
b) ZnCO3
c) ZnS
d) Zn ( OH )2

45) Iron obtained from the blast furnace is known as
a) Pig iron
b) Cast iron
c) Wrought iron
d) Steel

46) Which variety of iron has the lowest carbon content ?
a) Pig iron
b) Cast iron
c) Wrought iron
d) Steel

47) Cobalt is present in
a) Smaltite
b) Cobaltite
c) Cobalt glance
d) All of these

48) Zincite is
a) ZnS
b) ZnO
c) ZnCO3
d) ZnSO4

49) The compound which gives off oxygen on moderate heating is
a) Cupric oxide
b) Mercuric oxide
c) Zinc oxide
d) Aluminium oxide

50) The aqueous solution of the following salt will be coloured in the case of
a) Zn ( NO3 )2
b) Li NO3
c) Co ( NO3 )2
d) Zn SO4

51) Cupellation process is used in the metallurgy of
a) Cu
b) Ag
c) Zn
d) Al

52) When silver chloride is dissolved in ammonia the principal cation present in the solution is
a) [Ag ( NH3 )]2+
b) [Ag ( NH3 )2]+
c) Ag+
d) NH4 +

53) The oxidation state of mercury in Nessler’s reagent is
a) +5
b) +3
c) +6
d) +7

54) Fe3+ ion forms a prussian blue coloured precipitate with potassium ferro cyanide due to the formation of
a) K2 Fe [ Fe ( CN )6 ]3
b) Fe4 [ Fe ( CN )6 ]3
c) K3 [ Fe2 ( CN )6 ]3
d) Fe [ Fe ( CN )6 ]

55) Fusion of AgCl with Na2CO3 gives

a) Ag2CO3
b) Silver carbide
c) Ag
d) Ag2O

56) The formation of interstitial compounds makes a transition metal
a) More soft
b) More ductile
c) More metallic
d) More brittle

57) Treatment of ammonical silver nitrate with glucose gives
a) AgO
b) Ag
c) Ag2O

d) AgOH

58) Basic copper carbonate on heating gives
a) CuO,  CO2
b) CuO, NO2
c) Cu2O, CuO, CO2
d) Cu2O, CO2

59) The metal present in insulin is
a) Copper
b) Iron
c) Zinc
d) Magnesium

60) The substance which sublimes on heating is
a) MgCl2
b) AgCl
c) HgCl2
d) NaCl

61) Photographic plates are coated with a thin film of
a) AgCl
b) AgBr
c) Ag
d) AgNO3

62) The transition element not resistant to corrosion is
a) Fe
b) Ni
c) Co
d) All of these

63) The E . A . N of iron in Fe(Co) 5 is
a) 36
b) 56
c) 35
d) 54

64) Gold can show oxidation states
a) +1, +3
b) +1, +2
c) +1, +2, +3
d) +2, +3

65) The maximum density of lanthanides (in g cm -3 ) is
a) 6.77
b) 4.72
c) 9.74
d) None of these

66) In the preparation of chlorine from HCl MnO2 acts as
a) Oxidising agent
b) Reducing agent
c) Catalytic agent
d) Dehydrating agent

67) Purple of cassius is
a) AuCl3
b) AuCl4
c) Colloidal gold
d) None of these

68) Chloroauric acid is chemically
a) H2 [ AuCl4 ]
b) H [ AuCl4 ]
c) H3 [ AuCl4 ]
d) None of these

69) Calamine is chemically
a) ZnS
b) ZnCO3
c) ZnO. Fe2O3
d) ZnO

70) Red coloured chelates with demethyl glyoxine are formed by the transition metal ion
a) Cu2+
b) Ni2+
c) Cr3+
d) All of these

71) The oxidation state of mercury in Nessler’s reagent is
a) +2
b) +1
c) Zero
d) -1

72) Kepp’s waste mainly contains
a) FeS
b) FeCO3
c) FeSO4
d) None of these

73) The structure of chromyl chloride is
a) Angular
b) Planar
c) Tetrahedral
d) None of these

74) Chrome yellow is chemically
a) PbCrO4
b) Na2CrO4    
c) Na2Cr2O7
d) All of these

75) Magnetite is
a) Fe2O3
b) Fe2O3 3H2O
c) FeS2
d) Fe3O4

76) FeSO4 forms a brown ring with
a) NO2
b) NO
c) N2O
d) (NO)2

77) Mohr’s salt is a
a) Nomal salt
b) Basic salt
c) Microcosmic salt
d) Double salt

78) The most acidic oxide of chromium is
a) CrO
b) Cr2O3
c) CrO3
d) None of these

79) Adam’s calatyst is
a) Pt – PtO
b) Pt
c) Pt and PtO2
d) Pt2O and  PtO

80) Transition elements are good conductors because
a) They are all metals
b) They are all solids
c) They have free electrons in their outermost energy levels
d) All of these

81) Malachite is a mineral of
a) Mg
b) Al
c) Cu
d) Sn

82) The main ore of ion is its
a) Chloride
b) Sulphate
c) Nitrate
d) Oxide

83) The process in which an ore is heated in air below its melting point is known as
a) Romting
b) Calunation
c) Reduction
d) Distillation

84) Clock pendulums are made from
a) Brass
b) Invar
c) Solder
d) German silver

85) Ferrocene is regarded as a … derivative of the C5H5 anion.
a) Fe +
b) Fe3+
c) Fe2+
d) FeO

86) In silvery paints the main constituent is
a) Aluminium powder
b) Silver powder
c) Lead powder
d) White lead


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