D-F Block Elements Transition Elements MCQs – 1

1) The metallic core of the earth is known as
a) siderophil
b) lithophil
c) atomophil
d) chalcophil

2) Iron reacts with CO to give
a) tetra carbonyl iron(o)
b) penta carbonyl iron(o)
c) penta carbonyl iron(II)
d) tricarbonyl iron(II)

3) A red solid, which on heating gives oxygen
a) HgO
b) KMnO4
c) K2Cr2O7
d) KCIO3

4) The blue peroxide of chromium is
a) CrO2
b) CrO3
c) CrO4
d) CrO5

5) In [Ni(dmg)2] the oxidation number and co-ordination number of the metal are respectively
a) 0,2
b) 2,4
c) 2,2
d) 4,2

6) German Silver is an alloy of
a) Ag,Pb,Ca
b) Ag,Zn,Pt
c) Zn,Cu,Ni
d) Zn,Ag

7) The gas evolved when copper sulphate is heated is
a) SO2
b) SO3
c) SO2 and O2
d) SO3 and SO2

8) Purple of Cassius is a colloidal solution of gold obtained by reducing AuCI3 with
a) Zn
b) FeSO4
c) SnCI2
d) SnCI4

9) The compound used in vulcanisation of paper, fibre etc
a) sulphur
b) ZnCI2
c) Na2SO4
d) BaSO4

10) The number of transition series of metals is
a) 1
b) 2
c) 3
d) 4

11) Which triad of elements has the configuration (n-1)d10ns2?
a) Cu, Ag, Au
b) Pt, Pd, Ir
c) Hg, Cd, Zn
d) Ag, Au, Hg

12) The oxidising agent which converts MnO42- to MnO4 is
a) Mn++
b) PbO2
c) Mn+7
d) CI2

13) The common oxidising agent in Etard’s reaction is
a) CrO3
b) Cr2O72
c) CrO5
d) CrO2CI2

14) The radioactive element among lanthanides is
a) Ce
b) Pr
c) Nd
d) Pm

15) The common oxidation state of lanthanides is +3. The element which exhibits +2 oxidation state among lanthanides is
a) Eu
b) Gd
c) Ce
d) Ho

16) Among the first row transition metals, the highest oxidation state is exhibited by
a) Ti
b) V
c) Mn
d) Sc

17) Chromium is used as a protective and noncorrosive plating on other metals. Which of the following statements is not a correct interpretation of the properties of chromium?
a) Most transition metals are inert towards acids
b) a protective oxide layer is formed on the surface of Cr
c) It has a +ve value for its standard reduction potential
d) a protective oxide formed is Cr2O3

18) A pair of transition metals which can exhibit zero oxidation state in their compounds is
a) Cu, Ag
b) Co, Ni
c) Fe, Ni
d) Mu, Fe

19) Copper pyrites on roasting gives
a) Cu2O, FeO and SO2
b) Cu2S, FeO and SO2
c) CuO, Fe2 and SO2
d) Cu2O, Fe23 and SO3

20) Which of the following is not true of the NiCI42- ion?
a) Nickel is in the sp3 hybridized state
b) the complex ion is colourless
c) It is para magnetic
d) the oxidation number of Nickel is +2

21) A corrosive sublimate is
a) Hg2CI2
b) HgCI2
c) Hg (NH2)CI
d) Hg2S

22) A chemical used for preservation of timber is
a) ZnCI2
b) Hg2CI2
c) HgCI2
d) CuSO4

23) The most suitable method for the separation of lanthanides is
a) chromatography
b) distillation
c) solvent extraction
d) the ion-exchange method

24) The “Memory metal” is an alloy of
a) Ni, Ti
b) Ti, Cu
c) Ce, AI
d) Fe, Co, Ni

25) Which of the following statements is wrong about d-block elements?
a) The electronic configuration of these elements have two incomplete shells
b) The last electron enters into the d-orbital of the ante-penultimate shell
c) The last electron enters into the d-orbital of the penultimate shell
d) They are all metals

26) In transition elements, the incoming electron occupies the (n-1) d sub shell in preference to the
a) np-subshell
b) ns-subshell
c) (n-1) p-subshell
d) (n+1) s-subshell

27) The chemical formula of bauxite is

28) Anhydrous is prepared from
a) Conc. HCL and aluminum
c) Dry HCl gas and heated aluminium metal
d) Diluted HCl and aluminium metal

29) formation involves the evolution of a large quantity of heat which makes it useful in
a) Deoxidiser
b) Confectionery
c) Indoor photography
d) Thermite welding

30) Alum is

31) Elements of group 13 not reacting with water are
a) B
b) Ga
c) In
d) All the above

32) The ionic radius of Cr is minimum in which of the following compounds?

33) Which of the following cations has the least ionic radius?

34) With an increase in temperature, the conductivity of metals
a) increases
b) decreases
c) remains unaffected
d) may increase or decrease

35) The conductivity of the metal decreases with an increase in temperature because
a) the kinetic energy of the electrons increases
b) the movement of electron becomes haphazard
c) the kernels start vibrating
d) the metal becomes hot and starts emitting radiations

36) Metals possess lustre when freshly cut across because
a) They have a hard surface and light is reflected back
b) Their crystal structure contains ordered arrangement of their constituent atoms
c) They contain loosely bound electrons which absorb the photons and re-emit them
d) They are obtained from the minerals on which light has been falling for years

37) Metals are malleable and ductile because of
a) the presence of mobile electrons
b) the slipping of kernels over each other
c) The non-directional nature of their bonds
d) Their high density and melting point

38) Which of the following is a non-directional bond?
a) Metallic bond
b) Covalent bond
c) Co-ordinate bond
d) All are directional

39) The phosphate of a metal has the formula . The formula of its chloride would be

40) What is the oxidation number of chromium in potassium dichromate ?
a) + 2
b) + 3
c) + 6
d) – 4

41) Which of the following has the highest electrical conductivity ?
a) Zn
b) Fe
c) Ag
d) Cu

42) The leaching process is used to refine
a) Ag alone
b) Au alone
c) Both
d) None

43) Which of the following is most abundant in the earth crust ?
a) Boron
b) Aluminium
c) Gallium
d) Thallium

44) Which is most amphoteric ?
b) MgO
d) CaO

45) The chief ore of aluminium is
a) Cryolite
b) Feldspar
c) Kaolin
d) Bauxite

46) Duraluminium is an alloy of
a) Al and Mg
b) Al,Mg and Ni
c) Al,Mg,Mn and Cu
d) Al and Ni

47) An ore of iron is

48) The most abundant ore of iron is
a) Haematite
b) Limonite
c) Magnetite
d) Siderite

49) A blast furnace is used in the metallurgy of
a) Aluminium

b) Iron
c) Gold
d) Silver

50) Near the top of the blast furnace, iron oxides are reduced to spongy iron by
a) C
b) CO

51) The molten iron withdrawn from the blast furnace is
a) Wrought iron

b) Pig iron
c) Bessemer iron
d) Stainless steel

52) The brown ring formed in the ring test of nitrates is due to

53) Which of the following is not correct ?
b) Rusting of iron is electrochemical in nature
c) Rusting of iron takes place in moist air
d) Rusting of iron produces hydrated iron (III) oxide.

54) If a red hot steel rod is suddenly immersed in water, the steel becomes
a) Soft and malleable
b) Hard and brittle
c) Tough and ductile
d) Fibrous.

55) and exist as
a) Monomers
b) Polymers
c) Dimers
d) Trimers

56) Pig iron is also called
a) Cast iron
b) Steel
c) Wrought iron
d) Stainless steel

57) Which of the following is the impurest form of iron?
a) Bessemer iron
b) Steel
c) Pig iron
d) Wrought iron

58) Railway wagon axles are made by heating rods of iron embedded in charcoal powder. This process is known as
a) Case hardening

b) Annealing
c) Tempering
d) Quenching

59) The alloy steel used for making automobile parts and utensils is called
a) Nickel steel
b) Stainless steel
c) Tungsten steel
d) Chromium steel

60) Wrought iron is manufactured from cast iron by heating it with
a) C

61) The carbon content of
a) Steel is in between that of cast iron and wrought iron
b) Cast iron is in between that of steel and wrought iron
c) Wrought iron is in between that of steel and cast iron
d) Steel is higher than that of pig iron

62) Wrought iron is resistant to rusting and corrosion due to the presence of
b) Low percentage of carbon

63) The cores of electromagnets are prepared from
a) Pig iron

b) Steel
c) Stainless steel
d) Wrought iron

64) Steel is manufactured from cast iron by the
a) Bessemer Process alone
b) Open Hearth Process alone
c) Electric Furnace Process alone
d) All the three.

65) If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called
a) Annealing
b) Quenching
c) Tempering
d) Nitriding.

66) Nitriding of steel involves
a) Heating steel to 825-875 K in the presence of ammonia
b) Heating steel to 825-875 K in a current of nitrogen
c) Heating steel to red heat and then plunging it suddenly in ice- cold water
d) Heating steel to red heat and then cooling it slowly.

67) Stainless steel contains

68) Carbon in wrought iron is present as
a) Silicon carbide
b) Iron carbide
c) Graphite
d) Partly as iron carbide and partly as graphite.

69) The alloy steel invar contains
a) Fe = 80%, Mn = 14%

b) Fe = 74%, Cr = 18%, Ni = 8%
c) Fe = 64%, Ni = 36%
d) Fe = 98-96%, Ni = 2-4%.

70) The alloy steel having the smallest coefficient of expansion is called
a) Nickel steel
b) Tungsten steel
c) Manganese steel
d) Invar

71) Green vitriol is

72) Which of the following is a primary standard in volumetric analysis ?
d) HCl

73) Chemically, rust of iron is
a) Hydrated ferrous oxide

b) Hydrated ferric oxide
c) Only ferric oxide

74) Ferrous and ferric ions in solution may be distinguished by a/an
a) Silver nitrate solution

b) Lead acetate solution
d) Sodium chloride solution

75) Which of the following iron salts exists as a dimer ?
a) Ferric chloride
b) Ferrous chloride
c) Ferrous sulphate

76) Copper is mainly extracted from
a) Copper pyrites
b) Cuprite
c) Copper glance
d) Malachite

77) During roasting, copper pyrites are converted into a mixture of

78) Identify the metal M in the following reactions (Equations are unbalanced) .

The metal M is
a) Iron
b) Copper
c) Zinc
d) Mercury

79) Matte, the material obtained from the blast furnace during the metallurgy of copper, is a mixture of


80) The impure copper obtained from Bessemerization of molten matte is called
a) Blister copper
b) Bronze
c) Brass
d) None of the above

81) The most suitable method for extraction of copper from a low grade sulphide ore is the
a) Smelting process
b) Leaching process
c) Electrolytic process
d) Hydrometallurgical process

82) In electrolytic refining of copper, which of the following metals present as impurity pass into solution ?
a) Ag
b) Au
c) Zn only
d) Ni, Zn and Fe

83) The final step in the production of highly refined copper metal is
a) Smelting
b) Complexing
c) Roasting
d) Electrolytic refining

84) The anode sludge or anode mud obtained during electrolytic refining of copper consists of
a) Zn, Fe
b) Zn, Ni
c) Ag, Au
d) Ag, Zn

85) The coinage metals are
a) Fe, Co and Ni
b) Cu and Zn
c) Cu, Ag and Au
d) Au and Pt

86) Which of the following metals (among Cu, Ag and Au) react with chlorine to form their respective chlorides?
a) Cu alone
b) Ag alone
c) Au alone
d) All three

87) The reaction, is called
a) Reduction
b) Oxidation
c) Displacement
d) Disproportionation

88) The most convenient method for the extraction of silver from silver glance is
a) Leaching
b) Hydrometallurgy
c) Smelting
d) Roasting

89) Silver is precipitated from an aqueous solution of sodium argentocyanide by adding
a) Zinc dust
b) Copper powder
c) Sodium amalgam
d) Sodium thiosulphate

90) Which of the following statements about electrolytic refining of silver is not true ?
a) Anode consists of impure silver
b) Cathode consists of pure silver

91) The process used for the extraction of gold is
a) Mac Arthur-Forest Cyanide Process
d) Liquation process

92) Gold dissolves in a solution of alkali cyanide in the presence of oxygen forming


93) Impurities of Cu and Ag from gold are removed by
c) Electrolytically
d) Both (b) and (c)

94) Pure gold is
a) 18 Carat
b) 22 Carat
c) 14 Carat
d) 24 Carat

95) Gold jewellery is made from
a) 22 Carat gold
b) 24 Carat gold
c) 10 Carat gold
d) 14 Carat gold

96) In Plattners chlorine process for the extraction of gold, the reducing agent used is
b) Zn dust
c) Al powder
d) Cu metal

97) Which of the following is not an ore of copper?
a) Copper glance
b) Azurite
c) Malachite
d) Corundum

98) The malachite ore of copper is

99) Constantan is an alloy of
a) Cu and Ni
b) Fe and Ni
c) Cu and Sn
d) Cu and Zn

100) An alloy which does not contain copper is
a) Solder
b) Bronze
c) Brass
d) Bell metal


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