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

Please refer to MCQ Questions Chapter 8 The d – and f – Block Elements Class 12 Chemistry with answers provided below. These multiple-choice questions have been developed based on the latest NCERT book for class 12 Chemistry issued for the current academic year. We have provided MCQ Questions for Class 12 Chemistry for all chapters on our website. Students should learn the objective based questions for Chapter 8 The d – and f – Block Elements in Class 12 Chemistry provided below to get more marks in exams.

Chapter 8 The d – and f – Block Elements MCQ Questions

Please refer to the following Chapter 8 The d – and f – Block Elements MCQ Questions Class 12 Chemistry with solutions for all important topics in the chapter.

MCQ Questions Answers for Chapter 8 The d – and f – Block Elements Class 12 Chemistry

Question. Which of the following compounds is not coloured?
(a) Na₂CuCl₄
(b) Na₂CdCl₄
(c) FeSO₄
(d) VI₃                                     

Question. Atomic number of an element is 26. The element shows
(a) ferromagnetism
(b) diamagnetism
(c) paramagnetism
(d) None of these                     

Question. The magnetic moment of a transition metal of 3d-series is 6.92 BM. Its electronic configuration would be
(a) 3d⁴ 4s² 
(b) 3d^5 4s1
(c) 3d⁸ 4s¹
(d) 3d⁵ 4s⁰                                         

Question. Among the following, the coloured compound is
(a) CuCl
(b) K₃[Cu(CN)₄ ]  
(c) CuF₂
(d) [Cu(CH₃CN₄) ]BF₄                           

Question. Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d⁵  . What is its atomic number?
(a) 25
(b) 26
(c) 27
(d) 24           

Question. Metallic radii of some transition elements are given below. Which of these elements will have highest density?
Element                 Fe      Co      Ni        Cu
Metallic radii/pm   126     125    125     128
(a) Fe
(b) Ni
(b) Co
(d) Cu                       

Question.  The element with which of the following outer electron configuration may exhibit the largest number of oxidation states in its compounds. 
(a) 3d⁵ 4s² 
(b) 3d8 ^4s2
(c) 3d⁷ 4s²
(d) 3d⁶ 4s²                     

Question.  Iron exhibits + 2 and+3 oxidation states. Which of the following statements about iron is incorrect? 
(a) Ferrous oxide is more basic in nature than the ferric oxide
(b) Ferrous compounds are relatively more ionic than the corresponding ferric compounds
(c) Ferrous compounds are less volatile than the corresponding ferric compounds
(d) Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds   

Question. In context with the transition elements, which of the following statements is incorrect?
(a) In addition to the normal oxidation state, the zero oxidation state is also shown by these elements in complexes
(b) In the highest oxidation states, the transition metal shows basic character and form cationic complexes
(c) In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d-electrons are used for bonding
(d) Once the d⁵ configuration is exceeded, the tendency to involve all the 3d-electrons in bonding decreases                

Question. Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest E°_M3+/M2+ value? 
(a) Mn (Z = 25)
(b) Fe (Z = 26)
(c) Co (Z = 27)
(d) Cr (Z = 24)                           

Question. The correct order of E°_M2+/M / values with negative sign for the four successive elements Cr, Mn, Fe and Co is
(a) Mn > Cr > Fe > Co
(b) Cr > Fe > Mn > Co
(c) Fe > Mn > Cr > Co
(d) Cr > Mn > Fe> Co                         

Question. The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr³⁺ ion is
(a) 2.87 BM
(b) 3.87 BM
(c) 3.47 BM
(d) 3.57 BM                                 

Question. Identify the incorrect statement.
(a) Cu₂O is colourless 
(b) Copper (I) compounds are colourless except where colour results from charge transfer.
(c) Copper (I) compounds are diamagnetic
(d) Cu₂S is black               

Question. The ability of d-block elements to form complexes is due to
(a) small and highly charged ions
(b) vacant low energy orbitals to accept lone pair of electrons from ligands
(c) Both (a) and (b) are correct
(d) None of the above is correct                             

Question. Which one of the following characteristics of the transition metals is associated with their catalytic activity?
(a) Colour of hydrated ions
(b) Variable oxidation states
(c) High enthalpy of atomisation
(d) Paramagnetic behaviour                                       

Question. In alkaline H₂O₂, Cr₂O₇^2– changes to tetraperoxo species … having oxidation number of Cr as …
(a) CrO₄^2–, 6
(b) CrO₅, 6
(c) CrO₈^3–, 5
(d) CrO₈^3–, 11                           

Question. Which of the following arrangements does not represent the correct order of the property stated against it?
(a) V²⁺ < Cr²⁺ < Mn²⁺ < Fe²⁺  : paramagnetic behaviour
(b) Ni²⁺ < Co²⁺ < Fe²⁺ < Mn²⁺ : ionic size
(c) Co³⁺ < Fe³⁺ < Cr³⁺ < Sc³⁺ : stability in aqueous solution
(d) Sc < Ti < Cr < Mn : number of oxidation states                                 

Question. Which lanthanide compound is used as a pigment?
(a) CeO₂
(b) Ce(OH)₃
(c) Lu(OH)₃
(d) Tb(OH)₃

Question. Larger number of oxidation states are exhibited by the actinides than those by the lanthanides, the main reason being 
(a) 4 ƒ-orbitals more diffused than the 5 ƒ-orbitals
(b) lesser energy difference between 5ƒ and 6d than between 4 ƒ and 5d-orbitals
(c) more energy difference between 5 ƒ and 6d than between 4 ƒ and 5d-orbitals
(d) more reactive nature of the actinoides than the lanthanides

Question. The point of dissimilarity between lanthanides and actinides is 
(a) three outennost shells are partially filled
(b) they show oxidation state of + 3 (common)
(c) they are called inner-transition elements
(d) their are radioactive in nature

Question. Most common oxidation states of Ce (cerium) are
(a) +3, +4
(b) +2, +3 
(c) +2, +4
(d) +3, +5

Question. The correct order of ionic radius of Y³⁺, La³⁺, Eu³⁺ and Lu³⁺ is 
(a) Y³⁺ < La³⁺ < Eu³⁺ < Lu³⁺
(b) Lu³⁺ < Eu³⁺ < La³⁺ < Y³⁺
(c) La³⁺ < Eu³⁺ < Lu³⁺ < Y³⁺
(d) Y³⁺ < Lu³⁺ < Eu³⁺ < La³⁺

Question. The most stable oxidation state of lanthanides is
(a) + 2
(b) + 4
(c) 0
(d) + 3

Question. Which of the following has got incompletely filled ƒ-subshell ? 
(a) Gadolinium
(b) Lutetium
(c) Lawrencium
(d) Tantalum

Question. Lanthanide contraction is due to increase in
(a) shielding by 4 ƒ-electrons
(b) atomic number
(c) effective nuclear charge
(d) size of 4 ƒ-orbitals

Question. Identify the incorrect statement among the following. 
(a) d-block elements show irregular and erratic chemical properties among themselves 
(b) La and Lu have partially filled d-orbitals and no other partially filled orbital
(c) The chemistry of various lanthanoids is very similar
(d) 4 ƒ and Sf-orbitals are equally shielded

Question. The actinoides exhibit more number of oxidation states in general than the lanthanoides. This is because 
(a) the 5 ƒ-orbitals are more buried than the 4 ƒ-orbitals
(b) there is a similarity between 4 ƒ and 5 ƒ-orbitals in their angular part of the wave function
(c) the actinoids are more reactive than the lanthanoids
(d) the 5 ƒ-orbitals extend further from the nucleus than the 4 ƒ-orbitals

Question. Lanthanides are 
(a) 14 elements in the sixth period (atomic number= 90 to 103) that are filling 4 ƒ -sublevel
(b) 14 elements in the seventh period (atomic number = 90 to 103) that are filling 5 ƒ-sublevel
(c) 14 elements in the sixth period (atomic number = 58 to 71) that are filling 4 ƒ-sublevel
(d) 14 elements in the seventh period (atomic number = 58 to 71) that are filling 4 ƒ-sublevel

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

Question. Cerium (Z = 58) is an important member of the lanthanides. Which of the following statements about cerium is incorrect ? 
(a) The common oxidation states of cerium are +3 and +4
(b) The +3 oxidation state of cerium is more stable thanthe +4 oxidation state
(c) The +4 oxidation state of cerium is not known insolutions
(d) Cerium (IV) acts as an oxidising agent

Question. Which one of the following exist in the oxidation state other than +3 ?
(a) B
(b) Al
(c) Ce
(d) Ga

Question. Lanthanide contraction is caused due to 
(a) the appreciable shielding on outer electrons by 4 ƒ-electrons from the nuclear charge
(b) the appreciable shielding on outer electrons by 5d-electrons from the nuclear charge
(c) the same effective nuclear charge from Ce to Lu
(d) the imperfect shielding on outer electrons by 4 ƒ-electrons from the nuclear charge

Question. Which belongs to the actinides series ?
(a) Ce
(b) Cf
(c) Ca
(d) Cs

Question. Which of the following ions will finally give a black precipitate with Ag⁺ ion?
(a) SO₃²⁻
(b) Br⁻
(c) CrO₄²⁻
(d) S₂O₃²⁻                             

Question. Which pair of compounds is expected to show similar colour in aqueous medium?
(a) FeCl₃ and CuCl₂
(b) VOCl₂ and CuCl₂
(c) VOCl₂ and FeCl₂
(d) FeCl₂ and MnCl₂                   

Question. The atomic numbers of V, Cr, Mn and Fe respectively are 23, 24, 25 and 26. Which one of these may be expected to have the highest second ionisation enthalpy?
(a) Cr
(b) Mn
(c) Fe
(d) V                   

Question. . Highest oxidation state of manganese in fluoride is +4 (MnF₄)  but highest oxidation state in oxides is +7(Mn₂O₇ ) because
(a) fluorine is more electronegative than oxygen
(b) fluorine does not possess d-orbitals
(c) fluorine stabilises lower oxidation state
(d) in covalent compounds, fluorine can form single bond only while oxygen forms double bond                     

Question. Compound A on strong heating gives two oxides of sulphur. If aqueous NaOH solution is added to the aqueous solution of A, a dirty green precipitate is formed which starts turning brown on exposure to air. Compound A is
(a) ferrous hydroxide
(b) ferric sulphate
(c) ferrous sulphate
(d) ferric oxide                               

Question. (NH⁴)²Cr²O⁷ on heating gives a gas which is also given by
(a) heating NH₄NO₂
(b) heating NH₄NO₃
(c) Mg₃NH₂N₂O
(d) Na+H₂O₂                         

Question. Potassium dichromate when heated with concentrated sulphuric acid and a soluble chloride, gives brown-red vapours of
(a) CrO₃
(b) CrCl₃
(c) CrO₂Cl₂
(d) Cr₂O₃                           

Question. Which one of the following compounds does not decolourise an acidified aqueous solution of KMnO₄?
(a) Sulphur dioxide
(b) Ferric chloride
(c) Hydrogen peroxide
(d) Ferrous sulphate                       

Question. Cerium(Z = 58) is an important member of the lanthanides. Which of the following statements about cerium is incorrect?
(a) The common oxidation states of cerium are + 3 and +4
(b) The +3 oxidation state of cerium is more stable than + 4 oxidation state
(c) The +4 oxidation state of cerium is not known in solutions
(d) Cerium (IV) acts as an oxidising agent                                 

Question. In context of the lanthanoids, which of the following statements is not correct? 
(a) There is a gradual decrease in the radii of the members with increasing atomic number in the series
(b) All the members exhibit + 3 oxidation state
(c) Because of similar properties the separation of lanthanoids is not easy
(d) Availability of 4f-electrons results in the formation of compounds in + 4 state for all the members of the series                                   

Question. MnO₄⁻ on reduction in acidic medium forms
(a) MnO₂
(b) Mn²⁺
(c) MnO₄²⁻
(d) Mn                             

Question. When MnO₂ is fused with KOH, a coloured compound is formed, the product and its colour is
(a) K₂MnO₄, purple colour
(b) KMnO₄, purple
(c) Mn₂O₃, brown
(d) Mn₃O₄, black                                 

Question. The colour of KMnO₄ is due to
(a) M → L charge transfer transition
(b) d − d transition
(c) L → M charge transfer transition
(d) σ − σ transition                         

Question. When a small amount of KMnO₄ is added to concentrated H₂SO_4, a green oily compound is obtained which is highly explosive in nature. Compound may be
(a) MnSO₄
(b) Mn₂O₇
(c) MnO₂
(d) Mn₂O₃                               

Question. The electronic configuration of Eu (at. no. 63) and Tb (at. no. 65) are
(a) [Xe]4f⁶5d¹6s² and [Xe]4f⁹5d¹6s²
(b) [Xe]4f⁶5d¹6s² and [Xe]4f⁸5d¹6s²
(c) [Xe]4f⁷6s² and [Xe]4f⁹6s²
(d)[Xe]4f⁷5s² and [Xe]4f⁸5d¹6s²                           

Question. The outer electron configuration of Gd (atomic number 64) is 
(a) 4f³ 5d⁵ 6s²
(b) 4f⁸ 5d⁰ 6s²
(c) 4f⁴ 5d⁴ 6s²
(d) 4f⁷ 5d¹ 6s²                             

Question. Choose the correctly paired gaseous cation and its magnetic (spin only) moment in (B.M).
(a) Ti²⁺ , 3.87 BM
(b) Cr²⁺ , .90 4 BM
(c) Co³⁺ , 3.87 BM
(d)Mn²⁺, 4.90BM                   

Question. Lanthanoid contraction is caused due to
(a) the appreciable shielding on outer electrons by 4f-electrons from the nucleus
(b) the appreciable shielding on outer electrons by 5d-electrons from the nucleus
(c) the same effective nuclear charge from Ce to Lu
(d) the imperfect shielding on outer electrons by 4f-electrons from the nucleus                       

Question. Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being
(a) 4f-orbitals are more diffused than the 5f-orbitals
(b) lesser energy difference between 5f and 6d than between 4f and 5d-orbitals
(c) more energy difference between 5f and 6d than between 4f and 5d-orbitals
(d) more reactive nature of the actinoids than the lanthanoids             

Question. Arrange Ce³⁺ , La³⁺, Pm³⁺, and Yb³⁺ in the increasing order of their ionic radii.
(a) Yb³⁺ < Pm³⁺ < Ce³⁺ < La³⁺ 
(b) Ce³⁺ < Yb³⁺ < Pm³⁺  < La³⁺ 
(c) Yb³⁺ < Pm³⁺  < La³⁺ < Ce³⁺
(d) Pm³⁺  < La³⁺ < Ce³⁺ < Yb³⁺                                   

Question. Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the
following statements is incorrect? 
(a) Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character
(b) The ionic sizes of Ln (III) decrease in general with increasing atomic number
(c) Ln (III) compounds are generally colourless
(d) Ln (III) hydroxide are mainly basic in character           

Question. Identify the incorrect statment among the following.
(a) d-block elements show irregular and erratic chemical properties among themselves
(b) La and Lu have partially filled d-orbitals and no other partially filled orbitals
(c) The chemistry of various lanthanoids is similar
(d) 4f and 5f-orbitals are equally shielded         

Question. Copper exhibits only +2 oxidation state in its stable compounds. Why?
(a) Copper is transition metal in +2 state
(b) +2 state compounds of copper are formed by exothermic reactions
(c) Electron configuration of copper in +2 state is [Ar] 3d⁹, 4s⁰
(d) Copper gives coloured compounds in +2 state                             

Question. Among FeSO₄ . 7H₂O (A), CuSO₄ 5H O (B), ZnSO₄ 7H₂O (C) ,MnSO₄ 4H₂O (D) isomorphous salts are
(a) A and C
(b) A and D
(c) C and B
(d) A and B                       

Question. When a certain compound X (used in laboratory for analysis) is added to copper sulphate solution a yellow-brown precipitate is obtained which turns white on addition of excess of Na₂S₂O₃ solution. On addition to Ag⁺ ion solution, a yellow curdy precipitate is obtained which is insoluble in NH₄OH. The X is
(a) H₂S
(b) HCl
(c) KI
(d) NaCN                           

Question. Amongst the following the lowest degree of paramagnetism per mole of the compound at 298 K will be shown by
(a) MnSO₄ 4H₂O  
(b) CuSO₄ 5H₂O 
(c) FeSO₄ 6H₂O
(d) NiSO₄ 6H₂O                 

Question. A 0.081 g sample of pyrolusite ore (impure MnO₂) is treated with 1.651 g of oxalic acid (H₂C₂O₄ H₂O) × in an acidic medium. Following this reaction the excess oxalic acid is titrated with 30.6 mL of 0.1 M KMnO₄, the percentage of MnO₂ in the ore will be (Mn = 55)
    H₂C₂O₄ + MnO₂ + 2H⁺ → Mn²⁺ + 2H₂O + 2CO₂
    5H₂C₂O₄ + 2MnO⁻₄ + 6H⁺ → 2Mn²⁺ + 8H₂O+ 10CO₂
(a) 25%
(b) 50%
(c) 70%
(d) 82%                       

Question. Which of the following statements is not true?
(a) On passing H₂S  through acidified K₂Cr₂O₇ solution, a milky colour is observed
(b) Na₂Cr₂O₇ is preferred over K₂Cr₂O₇ in volumetric analysis
(c) K₂Cr₂O₇ solution in acidic medium is orange
(d) K₂Cr₂O₇ solution becomes yellow on increasing the pH beyond 7         

Question. Among the following compounds, the one which is both paramagnetic and coloured is
(a) K²Cr²O⁷
(b) (NH₄)₂ [TiCl₂]
(c) VOSO₄
(d) K₃ [Cu(CN)₄]                     

Question. MnO₄⁻ is of intense pink colour, though Mn is in (+7) oxidation state. It is due to
(a) oxygen gives colour to it
(b) charge transfer where oxygen gives its electron to Mn making it Mn (VI) hence, coloured
(c) charge transfer when Mn gives its electron to oxygen
(d) None of the above                   

Question. Which one of the following does not correctly represent the correct order of the property indicated against it?
(a) Ti < V < Cr < Mn increasing number of oxidation states
(b) Ti³⁺ < V³⁺ < Cr³⁺ < Mn³⁺  increasing magnetic moment
(c) Ti < V < Cr < Mn increasing melting point
(d)Ti < V < Mn < Cr increasing 2nd ionisation enthalpy                       

Question. A red solid is insoluble in water however, it becomes soluble, if some KI is added to water. Heating the red solid in a test tube results in liberation of some violet coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is
(a) (NH₄)₂Cr₄O₇ 
(b) HgI₂
(c) Hg
(d) Pb₃O₄                       

Question. KMnO₄ can be prepared from K₂MnO₄ as per the reaction, 3MnO^2–₄ + 2H₂O → 2MnO^–₄ + MnO₂ + 4OH^– The reaction can go completion by removing OH⁻ ions by adding
(a) HCl
(b) KOH
(c) CO₂
(d) SO₂                 

Question. 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-orbital and cupric ion has a complete d-orbital
(c) both have unpaired electrons in the d-orbitals
(d) cuprous ion has a completely filled d-orbital and cupric ion has an incompletely filled d-orbital       

Question. An explosion takes place when conc. H₂SO₄ is added to KMnO₄. Which of the following is formed?
(a) Mn₂O₇
(b) MnO₂
(c) MnSO₄
(d) Mn₂O₃                               

Question. One of the products formed due to the reaction between KMnO₄ and HCl is
(a) red liquid
(b) MnO₂
(c) greenish yellow gas
(d) HClO₄                             

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