Class 12 Chemistry Chapter 8 The d and f Block Elements MCQ Questions with answer

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The d and f Block Elements Class 12 MCQ Questions with Answers

Class 12 Chemistry MCQ with answers are given here to chapter The d and f Block Elements . These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Chemistry syllabus. By Solving these Class 12 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

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Question 1. The transition element which shows the highest oxidation state is: 
(a) Iron
(b) Vanadium
(c) Manganese
(d) Chromium

Question 2. Malachite is an ore of: 
(a) Silver
(b) Mercury
(c) Magnesium
(d) Copper

Question 3. The chief ore of Hg is: 
(a) Pyrolusite
(b) Bauxite
(c) Galena
(d) Cinnabar

Question 4. Transition elements form coloured ions due to :
(a) d-d transition 
(b) fully filled d-orbitals
(c) smaller atomic radii
(d) availability of s-electrons

5. CuSO₄ and KCN react to produce : 
(a) CuCN₂
(b) CuCN
(c) K₃[Cu(CN)₄]
(d) K₄[Cu(CN)₆ ]

Question 6. Gun metal is: 
(a) Cu + Zn
(b) Cu + Sn + Zn
(c) Cu + Sn
(d) Zn + Sn

Question 7. German silver is an alloy of: 
(a) Fe, Cr, Ni
(b) Ag, Cu Au
(c) Cu, Zn, Ni
(d) Cu, Zn, Sn

Question 8. Which of the following is greatest paramagnetic?
(a) Cu+
(b) Fe2+ 
(c) Fe3+
(d) Cu2+

Question 9. The Mohr’s salt is shown by: 
(a) FeSO₄ (NH₄)₂SO₄.6H₂O
(b) FeSO₄ (NH₃)2SO4.6H₂O
(c) K2SO₄Al₂ (SO₄ )3.24H₂O
(d) FeSO₃(NH₂ )4SO₄.6H₂O

Question 10. The number of water molecules in Mohr’s salt is :
(a) 2
(b) 4
(c) 6
(d) 8

Question 11. Philosopher’s wool on heating with BaO at 1100°C produces : 
(a) Ba + ZnCl₂
(b) BaCdO₂
(c) BaZnO₂
(d) BaO2 + Zn

Question 12. The composition of duralumin is :
(a) Al 94%, Mg 6%
(b) Cu 56%, Zn 24%, Ni 20%
(c) Cu 95%, Al 5%
(d) Al 95%, Cu 4%, Mn 0.5%, Mg 0.5%

Question 13. Lanthanide for which +II and +III oxidation states are common is : 
(a) La
(b) Pr
(c) Ce
(d) Eu

Question 14. Which of the following is not an ore of iron?
(a) limonite
(b) casiterite 
(c) magnetite
(d) none of these

Question 15. The colourless species is : 
(a) VCl₃
(b) VOSO₄
(c) Na₃VO₄
(d) [V(H₂O)₆]SO₄. H₂O

Question 16. F₂ is formed by reacting K₂MnF₆ with : 
(a) SbF₅
(b) MnF₃
(c) KSbF₆
(d) MnF₄

Question 17. Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other, in : 
(a) Ti⁺, Ti³⁺
(b) Cu⁺ , Cu²⁺
(c) Cr²⁺, Cr³⁺
(d) V^2+, VO²⁺

Question 18. Reagent S is
(a) K₄ [Fe(CN)₆ ]
(c) K₂CrO₄
(b) Na₂HPO₄
(d) KOH

Question 19. The colour imparted by Co(Il) compounds to glass is:
(a) Green
(b) Deep blue
(c) Yellow
(d) Red

Question 20. M₁ , Q and R, respectively are
(a) Zn^2- , KCN and HCl
(b) Ni²⁺ , HCI and KCN
(c) Cd²⁺ , KCN and HCl
(d) Co²⁺, HCI and KCN

Question 21. Which of the following has the maximum unpaired d-electrons?
(a) Fe²⁺
(b) Cu⁺
(c) Zn
(d) Ni³⁺

Question 22. Mercury is a liquid metal because 
(a) it has a completely filled d-orbital that causes d-d overlapping
(b) it has completely filled d-orbital that prevents d-d overlapping
(c) it has a completely filleds-orbital
(d) it has a small atomic size

Question 23. The element which forms ions in dimeric state is
(a) mercury
(b) nickel
(c) iron
(d) cadmium

Question 24. Which one of these is not known?
(a) CuCl₂
(b) Cul₂
(c) CuF₂
(d) CuBr₂

Question 25. Which of the following does not represent the correct order of the property indicated? 
(a) Sc³⁺ > Cr³⁺ > Fe³⁺ > Mn³⁺ — ionic radius
(b) Sc < Ti < Cr < Mn — density
(c) Mn²⁺ > Ni²⁺ > Co²⁺ < Fe²⁺ — ionic radius
(d) FeO < CaO < MnO < CuO — basic natw·e

Question 26. Cupric compounds are more stable than their cuprous counterparts in solid state. This is because 
(a) the endothermic character of the 2nd IP of Cu is not so high
(b) size of Cu²⁺ is less than Cu⁺
(c) Cu²⁺ has stable electronic configurations compared to cu⁺
(d) the lattice energy released for cupric compounds is must higher than Cu⁺

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Question 27. The electronic configuration of Cu is
(a) [Ne] 3s² ,3p⁶ ,3d⁹ ,4s²
(b) [Ne] 3s² , 3p⁶ ,3d¹⁰ ,4s¹
(c) [Ne] 3s² ,3p⁶ ,3d³ ,4s² ,4p⁶
(d) [Ne] 3s² ,3p⁵ ,3d⁵ ,4s² ,4p⁴

Question 28. Metal ion responsible for the Minamata disease is
(a) Co²⁺
(b) Hg²⁺ 
(c) Cu²⁺
(d) Zn²⁺

Question 29. Which one of the following ions has same number of unpaired electrons as those present in V³⁺ ion? 
(a) Fe³⁺
(b) Ni²⁺
(c) Mn²⁺
(d) Cr³⁺

Question 30. Which is not true for describing the catalytic activity of transition metals? 
(a) Their ability to adopt multiple oxidation states
(b) Their ability to form bonds between reactant molecule and atoms of the surface of catalysts
(c) Increasing the concentration of reactants at the catalyst surface
(d) Strengthening the bonds in the reacting molecules

Question 31. Which one of the following transition element has the lowest value of enthalpy of atomisation? 
(a) Cr
(b) Cu
(c) Zn
(d) M

Question 32. What is the ground state electron configuration of the Mn²⁺ ion?
(a) [Ar]4s¹,3d⁵
(b) [Ar]4s²,3d³
(c) [Ar]3d⁵
(d) [Ar]3d⁴

Question 33. Which of the following radioisotopes is used as anticancerous? 
(a) Na-24
(b) C-14
(c) U-235
(d) Co-60

Question 34. The colour of transition metal compound is due to
(a) complete ns subshell 
(b) small size metal ions
(c) incomplete (n – 1)d-subshell
(d) absorption of light in UV region

Question 35. Paramagnetism is exhibited due to which one of the following reason? 
(a) Presence of unpaired electrons
(b) Presence of completely filled electronic subshell
(c) By non-transition element
(d) By elements with noble gas configuration

Question 36. The purple colour of KMnO₄ is due to the transition 
(a) C.T. (L → M)
(b) C.T. (M → L)
(c) d – d
(d) p – d

37. To obtain silver from silver amalgam, it is heated in vessel which is made of – 
(a) Cu
(b) Fe
(c) Ni
(d) Zn

Question 38. Which of the following compound is coloured?
(a) TiCl₃
(b) FeCl₃ 
(c) CoCl₂
(d) All of these

Question 39. The colour of copper sulphide is 
(a) Blue
(b) Black
(c) Red
(d) Green

Question 40. Which one of the following statements concerning lanthanide elements is false? 
(a) Lanthanides are separated from one another by ion exchange method
(b) The ionic radii of trivalent lanthanides steadily increase with increase in atomic number
(c) All lanthanides are highly dense metals
(d) Most characteristic oxidation state of lanthanides is +3

Question 41. White silver surface turns black when O₃ is passed over it. This is due to the formation of
(a) silver hydroxide 
(b) freshly reduced silver which is black in colour
(c) silver oxide
(d) a complex compound of silver and ozone

Question 42. The compounds containing complex oxyanion CrO4^2- are intensely yellow coloured because
(a) Chromium ion in CrO4² is a transition metal ion 
(b) Cr and O are Π-bonded and the allowed Π → Π* transition occurs in the visible region
(c) Cr → O charge transfer is responsible for yellow colour
(d) Compounds have strong absorption at ~ 640 nm

Question 43. The only cations present in a slightly acidic solutions are Fe3+, Zn²⁺ and Cu²⁺. The reagent that when added in excess to this solution would identify and separate Fe³⁺ in one step is
(a) 2 M HCI
(b) 6 M NH₃ 
(c) 6 M NaOH
(d) H₂S gas

Question 44. In which of the following cases, the stability of two oxidation states is correctly represented
(a) Ti³⁺ > Ti⁴⁺
(b) Mn²⁺ > Mn³⁺
(c) Fe²⁺ > Fe³⁺
(d) Cu⁺ > Cu²⁺

Question 45. Cuprous ion is colourless while cupric ion is coloured because 
(a) Both have half filled p-and d-orbitals
(b) Cuprous ion has incomplete d-orbitaland cupric ion has a complete d-orbital
(c) Both have unpaired electrons in the d-orbitals
(d) Cuprous ion has complete d-orbital and cupric ion has an incomplete d-orbital.

Question 46. A compound of a metal ion Mx+ (Z = 24) has a spin only magnetic moment of 15 Bohr Magnetons. The number of unpaired electrons in the compound are 
(a) 2
(b) 4
(c) 5
(d) 3

Question 47. Identify the incorrect statement among the following : 
(a) Lanthanoid contraction is the accumulation of successive shrinkages.
(b) As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
(c) Shielding power of 4f electrons is quite weak.
(d) There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.

Question 48. Consider the following statements 
(I) La(OH)₃ is the least basic among hydroxides of lanthanides.
(II) Zr⁴⁺ and Hf⁴⁺ posses almost the same ionic radii.
(III) Ce⁴⁺ can as an oxidizing agent.
Which of the above is/are true ?
(a) (I) and (III)
(b) (II) and (III)
(c) (II) only
(d) (I) and (II)

Question 49. For d-block elements the first ionization potential is of the order 
(a) Zn > Fe > Cu > Cr
(b) Sc = Ti < V = Cr
(c) Zn < Cu < Ni < Co
(d) V > Cr > Mn > Fe

Question 50. Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is
[At. nos. Ti = 22, V = 23, Cr = 24, Mn = 25]
(a) Ti³⁺, V²⁺, Cr³⁺, Mn⁴⁺
(b) Ti⁺, V⁴⁺, Cr⁶⁺, Mn⁷⁺
(c) Ti⁴⁺, V³⁺, Cr²⁺, Mn³⁺
(d) Ti²⁺, V³⁺, Cr⁴⁺, Mn⁵⁺ 

Question 51. Which of the following has more unpaird d-electrons?
(a) N³⁺
(b) Fe²⁺
(c) Zn⁺
(d) Cu⁺

Question 52. Sc (Z = 21) is a transition element but Zn (Z = 30) is not because
(a) both Sc³⁺ and Zn²⁺ ions are colourless and form white compounds
(b) in case of Sc, 3d orbitals are partially filled but in Zn these are filled
(c) last electron is assumed to be added to 4s level in case of Zn
(d) both Sc and Zn do not exhibit variable oxidation states

Question 53. Which of the following ions has electronic configuration [Ar]3d⁶?
(a) Ni³⁺
(b) Mn³⁺
(c) Fe³⁺
(d) Co³⁺
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28) 

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