d-BLOCK ELEMENTS
Select one or more than one correct options.
Q.1 (T) imparts violet colour 






 

 4
2SO
H
.
conc
)
U
(
.
compd (V)Red gas 



 

 3
AgNO
NaOH (W)Red ppt.


 

.
ln
so
NH3 (X)
(W) Red ppt. 

 

HCl
.
dil (Y) white ppt.
(U)


 
NaOH
(Z) gas (gives white fumes with HCl)
sublimes on
heating
Identify (T)to (Z).
(A) T = KMnO4, U = HCl, V = Cl2, W = HgI2, X = Hg(NH2)NO3, Y = Hg2Cl2, Z = N2
(B) T=K2Cr2O7, U=NH4Cl, V=CrO2Cl2, W=Ag2CrO4, X=[Ag(NH3)2]+, Y=AgCl,Z = NH3
(C) T = K2CrO4, U = KCl, V = CrO2Cl2, W = HgI2, X = Na2CrO4, Y = BaCO3, Z = NH4Cl
(D) T = K2MnO4, U = NaCl, V = CrO3, W = AgNO2, X = (NH4)2CrO4, Y = CaCO3, Z = SO2
Q.2 The number ofmoles ofacidified KMnO4 required to convert sulphite ioninto sulphate ion is
(A) 2/5 (B) 3/5 (C) 4/5 (D) 1
Q.3 N2(g) + 3H2(g) 2NH3(g); Haber’s process, Mo is used as
(A) a catalyst (B) acatalytic promoter
(C) anoxidising agent (D) as a catalytic poison
Q.4 Potashalumis a double salt, its aqueous solution shows the characteristics of
(A)Al3+ ions (B) K+ ions (C) SO4
2– ions (D)Al3+ ions but not K+ ions
Q.5 
2
7
2O
Cr 
2
4
CrO
2 , X andYare respectively
(A) X = OH–, Y = H+ (B) X = H+, Y = OH–
(C) X = OH–, Y = H2O2 (D) X = H2O2, Y = OH–
Q.6 Additionofnon-metals like B and C to the interstitialsites ofa transition metalresults the metal
(A) ofmore ductability (B) ofless ductability (C) less malleable (D) ofmore hardness
Q.7 Mercury is a liquid at 0°C because of
(A) veryhighionisationenergy (B) weakmetallic bonds
(C) highheat ofhydration (D) highheat ofsublimation
Q.8 Q.7 CrO3 dissolves inaqueous NaOH to give
(A) Cr2O7
2– (B) CrO4
2– (C) Cr(OH)3 (D) Cr(OH)2
Q.9 The correct statement(s)about transitionelements is/are
(A) the most stable oxidation state is +3 and its stabilitydecreases across the period
(B) transition elementsof3d-series have almost same atomic sizes fromCr to Cu
(C) the stabilityof+2 oxidationstate increases across the period
(D) some transitionelements like Ni, Fe, Cr mayshow zero oxidation state insome oftheir compounds

Q.22 Transition elements are usually characterised by variable oxidation states but Zn does not show this
propertybecause of
(A) completionofnp-orbitals (B) completionof(n–1)d orbitals
(C) completionofns-orbitals (D) inert pair effect
Q.23 (NH4)2Cr2O7 (Ammoniumdichromate) isused infire works. The greencoloured powder blowninair is
(A) Cr2O3 (B) CrO2 (C) Cr2O4 (D) CrO3
Q.24 The transitionelement whichisaliquidat roomtemperature,havinghighspecific heat,lessreactivitythan
hydrogenand its chloride (MX2) isvolatile onheating is
(A) Cu (B)Hg (C) Ce (D) Pm
Q.25 Coinage metals show the properties of
(A) typicalelements (B) normalelements
(C) inner-transitionelements (D) transitionelement
Q.26 Iron becomes passive by..................... due to formation of .....................
(A) dil. HCl, Fe2O3 (B) 80% conc. HNO3, Fe3O4
(C) conc. H2SO4, Fe3O4 (D) conc. HCl, Fe3O4
Q.27 Bayer’s reagent used to detect olifinic double bond is
(A) acidified KMnO4 (B) aqueous KMnO4
(C) 1% alkaline KMnO4 solution (D) KMnO4 in benzene
Q.28 Amphoteric oxide(s) is/are
(A)Al2O3 (B) SnO (C) ZnO (D) Fe2O3
Q.29 Interstitialcompoundsare formed by
(A) Co (B) Ni (C) Fe (D) Ca
Q.30 The transitionmetalused in X-raystube is
(A) Mo (B) Ta (C) Tc (D) Pm
Q.31 The catalytic activityoftransitionelements isrelated to their
(A) variableoxidationstates (B) surface area
(C) complexformationability (D) magnetic moment
Q.32
x, yand z are respectively
(A) 1, 2, 3 (B) 1, 5, 3 (C) 1, 3, 5 (D) 5, 3, 1
Q.32 Cu + conc. HNO3  Cu(NO3)2 + X (oxide of nitrogen); then X is
(hot)
(A) N2O (B) NO2 (C) NO (D) N2O3
Q.33 WhenKMnO4 solutionis added to hot oxalic acid solution, the decolourisationis slow inthe beginning
but becomesinstantaneous after some time. This is because
(A) Mn2+ acts as auto catalyst (B) CO2 is formed
(C) Reactionis exothermic (D) MnO4
– catalyses the reaction.
Q.34 CuSO4 solutionreacts with excess KCN to give
(A) Cu(CN)2 (B) CuCN (C) K2[Cu(CN)2] (D) K3[Cu(CN)4]

Q.50 Amongst the followingspecies, maximumcovalent character is exhibited by
(A) FeCl2 (B) ZnCl2 (C) HgCl2 (D) CdCl2
Q.51 Number ofmoles of SnCl2 required for the reduction ofK2Cr2O7 into Cr2O3 is (in acidic medium)
(A) 3 (B) 2 (C) 1 (D) 1/3
Q.52 Amphoteric oxide(s)ofMn is/are
(A) MnO2 (B) Mn3O4 (C) Mn2O7 (D) MnO
Q.53 Identifythe species oftransition metalion of+6 oxidationstate
(A) MnO2 (B) CrO2Cl2 (C) KMnO4 (D) K2Cr2O7
Q.54 The aqueous solution ofCuCr2O7 is green because it contains
(A) green Cu2+ ions (B) green Cr2O7
2– ions
(C) blue Cu2+ ions and green Cr2O7
2– ions (D) blue Cu2+ ions and yellow Cr2O7
2– ions
Q.55 Manganese steelis used for making railways because
(A) it is hard withhighpercentage ofMn
(B) it is soft withhighpercentage ofMn
(C) it ishard withsmallconcentrationofmanganese withimpurities
(D) it issoft withsmallconcentrationofmanganese withimpurities
Q.56 In nitroprusside ion, the iron exists as Fe2+ and NO as NO+ rather than Fe3+ and NO respectively.
These forms ofions are established withthe help of
(A) magnetic moment insolid state (B) thermaldecompositionmethod
(C) byreaction with KCN (D) byaction with K2SO4
Q.57 Acidified KMnO4 can be decolourised by
(A) SO2 (B) H2O2 (C) FeSO4 (D) FeCl3
Q.58 Transitionelements inlower oxidation states act as Lewis acid because
(A) theyformcomplexes (B) theyare oxidising agents
(C) theydonate electrons (D) theydo not show catalytic properties
Q.59 The lanthanide contraction is responsible forthe fact that
(A) Zr and Hf have same atomic sizes (B) Zr and Hf have same properties
(C) Zr and Hf have different atomic sizes (D) Zr and Hf havedifferent properties
Q.60 The Ziegler-Natta catalyst used for polymerisation of ethene and styrene is TiCl4 + (C2H5)3Al, the
catalysing species (active species) involved inthe polymerisation is
(A)TiCl4 (B)TiCl3 (C)TiCl2 (D)TiCl
Q.61 Anionofdefinite magnetic moment (spinonly) is
(A) Sc3+ (B)Ti3+ (C) Cu2+ (D) Zn2+
Q.62 The electronswhichtake part inorder to exhibit variableoxidation states bytransitionmetals are
(A) ns only (B) (n–1)d only
(C) ns and (n–1)d onlybut not np (D) (n–1)d and np onlybut not ns
Q.63 ‘Bordeauxmixture’is used as afungicide. It is a mixture of
(A) CaSO4 + Cu(OH)2 (B) CuSO4 + Ca(OH)2
(C) CuSO4 + CaO (D) CuO + CaO
Q.64 Which ofthe following reactionispossible at anode?
(A) 2Cr3+ + 7H2O  
2
7
2O
Cr + 14 H+ (B) F2  2 F–
(C) 2
O
2
1
+ 2H+  H2O (D) None ofthese

ANSWER KEY
Q.1 B Q.2 A Q.3 B Q.4 A,B,C Q.5 A
Q.6 B,C,D Q.7 A,B Q.8 B Q.9 A,B,C,D Q.10 A
Q.11 B Q.12 A,B Q.13 A Q.14 A Q.15 A,B
Q.16 A,B,D Q.17 A,B,C Q.18 B,C Q.19 B Q.20 A
Q.21 B Q.22 B Q.23 A Q.24 B Q.25 D
Q.26 B Q.27 C Q.28 A,B,C Q.29 A,B,C Q.30 A
Q.31 A,B,C Q.32 B Q.32 B Q.33 A Q.34 D
Q.35 A Q.36 A,B Q.37 B,C Q.38 A Q.39 A
Q.40 B Q.41 A,C Q.42 D Q.43 A Q.44 A,B
Q.45 C Q.46 D Q.47 A,B,C,D Q.48 C Q.49 D
Q.50 C Q.51 A Q.52 A Q.53 B,D Q.54 D
Q.55 A Q.56 A Q.57 A,B,C Q.58 A Q.59 A,B
Q.60 B Q.61 B,C Q.62 C Q.63 B Q.64 A
Q.65 B Q.66 A Q.67 B Q.68 A Q.69 B
Q.70 C Q.71 C Q.72 B Q.73 A Q.74 A
Q.75 C