D-F Block Elements Transition Elements MCQs – 5

1) The electronic configuration of actinides cannot be assigned with any degree of certainty because of the
a) Overlapping of inner orbitals
b) Free movement of electrons over all the orbitals
c) Small energy difference between 5f and 6d levels
d) None of the above

2) Which out of the following has the lowest melting point ?
a) Ga
b) Cs
c) Pb
d) Hg

3) The equilibrium
a) Exists in an acidic medium
b) Exists in a basic medium
c) Exists in a neutral medium
d) None of the above

4) The reaction + CI2 + 2 Cltakes place in
a) A basic medium
b) an acidic medium
c) a neutral medium
d) Both (a) and (b)

5) The adsorption of hydrogen on Pd metal is called
a) Hydrogenation
b) Occlusion
c) Reduction
d) Hydration

6) Transition metals form complexes in their zero oxidation state. The example of the above fact is
a)
b)
c)
d)

7) Boiling CuCI2 with Cu in conc. HCI gives
a) CuCI
b)
c)
d)

8) The oxidation state of Re in KReO4 is
a) +4
b) +6
c) +7
d) +3

9) Pick out the covalent halide from the following:
a)
b)
c)
d)

10) Which of the following metals is used in the manufacture of NH3 by Habers process ?
a) Cr
b) Fe
c) Ni
d) V

11) Which of the following transition metals can be used to reduce steam to hydrogen ?
a) Pt
b) Pb
c) Tl
d) Fe

12) Which of the following species is paramagnetic in nature ?
a) Cu crystals
b)
c)
d)

13) Permanent magnets are generally made of alloys of
a) Co
b) Zn
c) Mn
d) Pb

14) A chromium compound widely used in the tanning of leather is
a)
b)
c)
d)

15) The transition elements have the general electronic configuration
a)
b)
c)
d)

16) On adding Kl to a solution of CuSO4
a) Cupric oxide is precipitated
b) Metallic copper is precipitated
c) Cuprous iodide is precipitated with the liberation of iodine
d) No change takes place

17) @ What is the effect of shaking dil. H2SO4 with a small quantity of anhydrous CuSO4 ?
a) The white solid dissolves to form a colourless solution
b) The white solid dissolves to form a blue solution
c) The white solid dissolves to form a green solution
d) The white solid turns blue but does not dissolve

18) Which of the following properties would you not expect copper to exhibit ?
a) High thermal conductivity
b) Low electrical conductivity
c) Ductility
d) Malleability

19) Which of the following dissolves in hot conc. NaOH?
a) Fe
b) Zn
c) Cu
d) Ag

20) Galvanization is the
a) Deposition of Zn on Fe
b) Deposition of Al on Fe
c) Deposition of Sn on Fe
d) Deposition of Cu on Fe

21) Which forms interstitial compounds ?
a) Fe
b) Co
c) Ni
d) All

22) @ When ammonia is added to a cupric salt solution, the deep blue colour so observed is due to the formation of
a)
b)
c)
d)

23) Which forms coloured salts ?
a) Metals
b) Non-metals
c) p-Block elements
d) Transition elements

24) Which element belongs to the d-block ?
a) Na
b) Ca
c) Cu
d) Ar

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

26) Transition elements are coloured
a) Due to their small size
b) Due to their metallic nature
c) Due to their unpaired d-electrons
d) All the above

27) In solid CuSO4. 5 H2O, copper is coordinated to
a) Five water molecules
b) Four water molecules
c) One sulphate ion
d) One water molecule

28) The most important oxidation state of Cu is
a) +2
b) +1
c) + 3
d) +4

29) Verdigris is
a) Basic copper acetate
b) Basic lead acetate
c) Basic lead
d) None

30) A white powder soluble in NH4OH but insoluble in water
a)
b)
c)
d) AgCI

31) Which of the following is not a property of transition elements ?
a) Colour
b) Paramagnetic
c) Fixed valency
d) Catalytic

32) Which of the following statements concerning transition elements is false ?
a) They are all metals
b) They easily form complex coordination compounds
c) Compounds containing their ions are mostly coloured
d) They show multiple oxidation states always differing by units of two

33) Which one of the following ions has the highest magnetic moment ?
a)
b)
c)
d)

34) The chemical formula of basic copper acetate is
a)
b)
c)
d)

35) Which one of the following ions will have the maximum number of unpaired electrons ? (At. No. Fe = 26, Co = 27)
a)
b)
c)
d)

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

37) Transition elements exhibit variable valency because they release electrons from the following orbits:
a) ns
b) ns and np
c) (n – 1)d and ns
d) (n – 1)d

38) The oxidation state of Cr in K2Cr2O7 is
a) +5
b) +3
c) +6
d) +7

39) The correct formula of permaganic acid is
a)
b)
c)
d)

40) The equivalent weight of MnSO4 is half of its molecular weight when it is converted to
a)
b)
c)
d)

41) Among the following, the lowest degree of paramagnetism per mole of the compound at 298°K will be shown by
a)
b)
c)
d)

42) Galvanised iron sheets are coated with
a) Zn
b) Cu
c) Ni
d) Cd

43) the percentage of gold in 18 carat gold is
a) 18
b) 75
c) 83-6
d) 100

44) Which of the following statements is correct ?
a) Iron belongs to the third transition series of the periodic table
b) Iron belongs to the f-block of the table
c) Iron belongs to the first transition series
d) Iron belongs to group 7 of the periodic table

45) Which of the following transition metal cations has the maximum unpaired electrons?
a)
b)
c)
d)

46) Which of the following metals are displaced by copper from their salt solutions ?
a)
b)
c)
d) All of the above

47) Which does not form amalgam ?
a) Fe
b) Co
c) Ag
d) Zn

48) Rust is
a)
b)
c)
d)

49) The colour in transition metal compounds is attributed to the
a) Small sized metal ions
b) Absorption of light in UV region
c) Complete ns subshell
d) Incomplete (n – 1) d subshell

50) The correct ground state electronic configuration of the chromium atom is
a)
b)
c)
d)

51) In the first transition series, the highest oxidation state is exhibited by
a) Mn
b) Ni
c) Fe
d) Cr

52) Zinc does not show a variable valency like d-block elements because
a) It is a soft metal
b) It is low melting
c) Two electrons are present in the outermost orbit
d) the d-orbital is complete

53) Which of the following electronic configurations is that of a transition element ?
a)
b)
c)
d)

54) The electronic configurations of four elements are given below. Which element does not belong to the same family as others ?
a)
b)
c)
d)

55) An example of a double salt is
a) Bleaching powder
b)
c) Hypo
d) Potash alum

56) The brown colour ring obtained in the ring test for nitrates is due to the formation of
a)
b)
c)
d)

57) Which of the following compounds is used as the starting material for the preparation of potassium dichromate ?
a)
b)
c)
d)

58) The aqueous solution of the following salts will be coloured in the case of
a)
b)
c)
d) Potash alum

59) Which of the following transition metal ions will have a definite value of magnetic moment ?
a)
b)
c)
d)

60) Which of the following metals exhibits more than one oxidation state ?
a) Na
b) Mg
c) Fe
d) Al

61) Which of the following compounds is formed when a mixture of K2Cr2O7? and NaCI is heated
with conc. H2SO4 ?

a)
b)
c)
d)

62) The equilibrium Cr2O2-7 2 CrO2-4 is shifted to the right in
a) An acidic medium
b) A basic medium
c) A neutral medium
d) It does not exist

63) The first ionisation energies of the elements of the first transition series (Ti Cu)
a) Increase as the atomic number increases
b) Decrease as the atomic number increases
c) Do not show any change as the addition of electrons takes place in the inner (n – 1) d orbitals
d) Increase from Ti to Mn and then decrease from Mn to Cu

64) Of the following which has the highest magnetic moment ?
a)
b)
c)
d)

65) The process of heating of steel to a temperature much below redness and then slowly cooling is called
a) Annealing
b) Hardening
c) Tempering
d) Cast hardening

66) The rusting of iron is catalysed by
a) Fe
b)
c) Zn
d)

67) An acidified solution of potassium permanganate oxidizes
a) Sulphates
b) Sulphites
c) Nitrates
d) Ferric salts

68) The reaction MnO4 + e MnO2-4 takes place in
a) A basic medium
b) An acid medium
c) A neutral medium
d) Both acidic and basic media

69) The number of unpaired electrons in a ferrous ion is
a) 3
b) 2
c) 4
d) 5

70) An atom with atomic number 21 belongs to the category of
a) s-Block elements
b) p-Block elements
c) d-Block elements
d) f-Block elements

71) Cr has the electronic configuration
a)
b)
c)
d) None of these

72) Which is not amphoteric ?
a)
b)
c)
d)

73) The trace metal present in insulin is
a) Fe
b) Co
c) Zn
d) Mn

74) The electronic configuration of the element which is just above the element with atomic number 43 in the same periodic group is
a)
b)
c)
d)

75) Which of the following has the maximum number of unpaired d-electrons ?
a) Zn
b)
c)
d)

76) Transition metals are often paramagnetic owing to
a) their high m.p. and b.p.
b) The presence of vacant orbitals
c) The presence of unpaired electrons
d) their malleability and ductility

77) Which one of the following metal ions is colourless?
a)
b)
c)
d)

78) Identify the statement which is not correct regarding CuSO4:
a) It reacts with Kl to give iodine
b)
c)
d) It gives CuO on strong heating in air

79) Copper sulphate solution reacts with KCN to give
a)
b) CuCN
c)
d)

80) AgCI is soluble in
a) Aqua regia
b) Sulphuric acid
c) HCI
d) Ammonia

81) Which of the following statements is wrong about transition elements ?
a) All elements form complexes
b) All transition metal compounds are paramagnetic
c) All show variable valency
d) All are coloured ions

82) The first transition element is
a) Cr
b) Sc
c) Ni
d) Cu

83) The first man made atom is
a) Os
b) Na
c) Zr
d) Tc

84) The electronic configuration (outermost) of Mn2+ ion (At. No. of Mn = 25) in its ground state is
a)
b)
c)
d)

85) Manganese achieves its highest oxidation state in its compound
a)
b)
c)
d)

86) The highest magnetic moment is shown by the transition metal ion with the outer electronic configuration
a)
b)
c)
d)

87) Which one of the following has the least magnetic moment ?
a)
b)
c)
d)

88) AgCI precipitate dissolves in NH3 due to the formation of
a)
b)
c)
d)

89) The passivity of iron is due to the formation of
a)
b)
c)
d) None

90) Which of the following is a transition element ?
a) Al
b) As
c) Ni
d) Rb

91) The common oxidation states of Ti are
a) +2, +3
b) +3, +4
c) —3, —4
d) +2, +3, +4

92) Which of the following types of metals make the most efficient catalysts ?
a) Transition metals
b) Alkali metals
c) Alkaline earth metals
d) Coloured metals

93) Which one of the transition metal ions is coloured ?
a)
b)
c)
d)

94) Transition metals
a) Exhibit diamagnetism
b) Undergo inert pair effect
c) Do not form alloys
d) Show variable oxidation states

95) Which one of the following shows highest magnetic moment ?
a)
b)
c)
d)

96) Which one of the following transition metal ions has the lowest density ?
a) Copper
b) Nickel
c) Scandium
d) Zinc

97) When a mixture of K2Cr2O7, conc. H2SO4 and KCI is heated
a)
b)
c)
d)

98) When (NH4)2Cr2O7 is heated, the gas evolved is
a)
b)
c)
d)

99) When SO2 is passed through acidified K2Cr207 solution
a) The solution turns blue
b) The solution is decolourised
c)
d)

100) In the presence of dilute sulphuric acid, the equivalent weight of potassium permanganate is
a) 1/5 of its molecular weight
b) 1/6 of its molecular weight
c) 1/10 of its molecular weight
d) 1/12 of its molecular weight


Answer

Leave a Reply

Your email address will not be published. Required fields are marked *