D-F Block Elements Transition Elements MCQs – 7

1) Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are
a) Metalloids
b) Non-metals
c) Transition elements
d) Gases

2) Transuranic elements begin with
a) Np
b) Cm
c) Pu
d) U

3) Stainless steel does not rust because
a) Nickel present in it does not rust
b) Iron forms a hard chemical compound with chromium present in it
c) Chromium forms an oxide layer that protects iron from rusting
d) Chromium and nickel combine with iron

4) Among Sc (III), Ti (IV), Pd (II) and Cu (II) ions
a) All are paramagnetic
b) All are diamagnetic
c) Sc (III), Ti (IV) are paramagnetic and Pd (II), Cu (II) are diamagnetic
d) Sc (III), Ti (IV) are diamagnetic and Pd (II), I Cu (III) are paramagnetic

5) “925 fine silver” means an alloy of
a) 7.5% Ag and 92.5% Cu
b) 92 . 5% Ag and 7 . 5% Cu
c) 80% Ag and 20% Cu
d) 90% Ag and 10% Cu

6) Which of the following statement(s) is (are) correct when a mixture of NaCI and K2Cr2O7 is gently warmed with conc. H2SO4 ?
a) A deep red vapour is evolved
b) The vapour when passed into NaOH solution gives a yellow soln. of sodium chromate
c) Chromyl chloride is formed
d) All the above

7) Which of the following are coloured ?
a)
b)
c)
d) All the above

8) Which of the following compounds give colour due to charge transfer ?
a)
b)
c)
d) All the above

9) The correct statement(s) about transition metals is/are that they
a) Form complexes
b) Show variable oxidation states
c) Show magnetic properties
d) All the above

10) Select the compounds/atoms where the oxidation number of the metals is zero:
a)
b)
c)
d) All the above

11) Which of the following compounds have the oxidation number of the metals as +1 ?
a) CuSCN
b)
c)
d) All are correct

12) Which of the following are ionic compounds ?
a)
b) AgCI
c)
d) Both a and b

13) Which of the following are not soluble in excess of NaOH ?
a)
b)
c)
d) Both b and c

14) Which of the following pairs of ions can be separated by H2S in dilute HCI ?
a)
b)
c)
d) Both b and c

15) Transition elements have a greater tendency to form complexes because they have
a) Vacant d-orbita!s
b) Small sizes
c) Higher nuclear charge
d) All the above

16) Potassium ferrocyanide is used to detect
a)
b)
c)
d) All the above

17) Select diamagnetic ions from the following.
a)
b)
c)
d) All the above

18) The colour of transition metal ions is due to
a) d— d Transition
b) Charge transfer
c) Incompletely filled d-orbitals
d) All the above

19) Iron sheets are galvanised to
a) Prevent rusting
b)
c) Prevent oxidation of Fe
d) All the above

20) (NH4)2Cr2O7 on heating gives
a)
b)
c)
d) Both a and b

21) The metals which are much more noble than Au and Pt and are insoluble in aqua regia are
a) Ir
b) Rh
c) Os
d) Both a and b

22) The catalyst used in the manufacture of H2SO4 by contact process is
a)
b)
c) Platinised asbestos
d) All the above

23) Which of the following gives a black precipitate when H2S gas is passed through an ammonical solution?
a) Copper acetate
b) Cobalt sulphate
c) Nickel chloride
d) Both (b) and (c)

24) The impurity of sulphur makes the iron
a) Fibrous
b) Red short
c) Cold short
d) Malleable

25) FeSO4 on heating gives
a)
b)
c)
d) All the above

26) The transition metals which do not form amalgams are
a) Zn
b) Fe
c) Pt
d) Both b and c

27) Substances which do not react with cold water, but react with steam are
a)
b)
c)
d) C, Fe, Mg

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

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

30) The correct formula of permanganic acid is
a)
b)
c)
d)

31) The configuration of a chromium atom in the ground state is
a)
b)
c)
d)

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

33) Which of the following configurations is correct for iron?

a)
b)
c)
d)

34) The correct electronic configuration of Ti (Z= 22) atom is
a)
b)
c)
d)

35) The chloride of which of the following elements will be coloured?
a) Silver
b) Mercury
c) Zinc
d) Cobalt

36) Which of the following properties is not that of a transition element ?
a) Colour
b) Paramagnetism
c) Fixed valency
d) None of these

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

38) Which of the following has a magnetic moment value of 5.9 ?
a)
b)
c)
d)

39) Which of the following sets of metallic ions has equal magnetic moment?
a)
b)
c)
d)

40) Which of the following species will impart colour to an aqueous solution?
a)
b)
c)
d)

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

42) The formation of interstitial compounds makes the transition metal
a) More soft
b) More ductile
c) More metallic
d) More hard

43) Which one of the following is paramagnetic?
a)
b)
c)
d) None of these

44) An explosion takes place when conc. H2SO4 is added to KMnO4. Which of the following is formed?
a)
b)
c)
d)

45) The lanthanide contraction is responsible for the fact that
a) Zr and Y have the same radius
b) Zr and Nb have similar oxidation state
c) Zr and Hf have almost the same radius
d) Zr and Zn have same oxidation state

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

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

48) Which is not correct about the transition elements ?
a) Diamagnetism
b) Paramagnetism
c) Form complexes
d) Show variable oxidation states

49) The elements of the d-group are called
a) Transition elements
b) Transuranic elements
c) Metals
d) Metalloids

50) Coloured salts are formed by
a) Alkali metals
b) Alkaline earth metals
c) Actinides
d) Transition elements

51) The electronic configuration of the transition elements is represented by
a)
b)
c)
d)

52) A transition element X has a configuration [Ar]3d4 in its +3 oxidation state. Its atomic number is
a) 25
b) 26
c) 22
d) 19

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

54) Of the ions, Zn2+ , Ni2+, and Cr3+ (atomic number of Zn = 30, Ni = 28 and Cr = 24)
a)
b) All these are colourless
c) All these are coloured
d)

55) Which of the following is not correct about transition elements?
a) Their melting and boiling points are high
b) Their compounds are generally coloured
c) Their compounds are generally coloured
d) They do not exhibit variable valency

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

57) Which of the following cannot give iodometric titration?
a)
b)
c)
d)

58) RRR Which lanthanide is commonly used?
a) Lanthanum
b) Niobium
c) Thorium
d) Cerium

59) Among KO2 , NO , BaO2 and NO, unpaired electrons are present in
a)
b)
c)
d)

60) A characteristic feature of transition elements is
a) They show variable oxidation states
b) They do not form complex ions
c) They all exhibit diamagnetism
d) They show inert pair effect

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

62) The formula of green vitriol is
a)
b)
c)
d)

63) The electronic configuration of scandium (Z = 21) is
a)
b)
c)
d)

64) The number of electrons in the outermost shell of the 3d-transition elements generally remains
a)
b)
c)
d)

65) The tendency of 3d-metal ions to form stable complexes is due to their
a) Variable oxidation states
b) Strong electronegative nature
c) High charge/size ratio and vacant d-orbitals
d) Very low ionisation energies

66) The 3d-metal ions are paramagnetic in nature because
a) They are reducing agents
b) They have one or more paired electrons
c) They have one or more unpaired d-electrons
d) They form coloured salt

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

68) The atomic number of an element is 26. The element shows
a) Ferromagnetism
b) Diamagnetism
c) Same valence
d) None of these

69) The general electronic configuration of transition elements is
a)
b)
c)
d) None

70) Transition elements are good conductors because
a) They are metals
b) They are all solids
c) They have free electrons in outer energy orbits
d) All of these

71) Which of the following is the stable electronic configuration of the Fe3+ ion ?
a)
b)
c)
d)

72) The most characteristic oxidation state of the lanthanides is
a) +1
b) +2
c) +3
d) +4

73) Which of the following has the highest magnetic moment ?
a)
b)
c)
d)

74) Which of the following ion cannot exhibit magnetic properties ?
a)
b)
c)
d)

75) The purest form of iron is
a) White cast iron
b) Grey cast iron
c) Wrought iron
d) Steel

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

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

78) The element which follows the lanthanides in the 6th period is
a) Hf
b) Zr
c) Nb
d) Mn

79) The oxides, CrO3, MoO3, and WO3 are strongly
a) Acidic
b) Basic
c) Neutral
d) None of these

80) Transition elements are
a) All metals
b) All non metals
c) Metals and non metals
d) Gases

81) In which of the following does the metal atom have an effective atomic number of 36 ?
a)
b)
c)
d)

82) In which of the following compounds does iron have the lowest oxidation state ? Â
a)
b)
c)
d)

83) What factors make the separation of lanthanides a formidable task ?
a) The similarity in ionic size
b) the constant charge of +3
c) the same charge-to-radius ratio
d) All the above

84) Which of the following pairs of elements attain identical ionic radii as a consequence of lanthanide contraction?
a)
b)
c)
d)

85) Misch metals are
a) Alloys of rare earth metals
b) Alloys of d-block elements
c) Special steels
d) Alloy of Al, Mg, Gd

86) The ionic radii of zirconium and hafnium become almost identical because
a) They are d-block elements
b) They belong to the same group
c) Of increased nuclear charge
d) Of lanthanide contraction

87) Lanthanides are separated best by
a) Fractional crystallization
b) Solvent extraction
c) Complex formation using EDTA
d) Ion exchange resins

88) Which of the following are stable +2 ions of lanthanides in aqueous solution?
a)
b)
c) Both
d) None

89) The highest magnetic moment is exhibited by the transition metal ion bearing the outer configuration
a)
b)
c)
d)

90) Platinum, Palladium and Iridium are called noble metals, because
a) Alfred Nobel discovered them
b) They are inert towards many common reagents
c) They are shining, lustrous and pleasing to look at
d) They are found in active state

91) Which of the following is chromic anhydride ?
a)
b)
c)
d) None

92) The chemical formula for the acidic oxide of Cr is
a)
b)
c)
d)

93) Transition elements form complexes very readily because of their
a) Small cation size
b) Vacant d-orbitals
c) Large ionic charge
d) All are correct

94) Which of the following forms interstitial compounds ?
a) Fe
b) Co
c) Ni
d) All

95) Rust is
a)
b)
c)
d)

96) Platinum metal can be dissolved in
a)
b) Hot conc. HCl
c)
d) A mixture of conc.HCl and conc.HNO3

97) Which has maximum ferro-magnetic character ?
a) Co
b) Ni
c) Pt
d) Fe

98) Which is soluble in aqua regia ?
a) Co
b) Fe
c) Ni
d) All

99) The transition metal present in vitamin B12 is
a) Fe
b) Co
c) Ni
d) Na

100) When steam is passed over heated iron, one of the products formed is
a) FeO
b)
c)
d)


Answer

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