Students of class 12 Chemistry should refer to MCQ Questions Class 12 Chemistry The D – and F – Block Elements with answers provided here which is an important chapter in Class 12 Chemistry NCERT textbook. These MCQ for Class 12 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 12 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 12 Chemistry examination

Chapter 8 The D – and F – Block Elements MCQ with Answers Class 12 Chemistry

MCQ Questions Class 12 Chemistry The D – and F – Block Elements provided below have been prepared by expert teachers of grade 12. These objective questions with solutions are expected to come in the upcoming Standard 12 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. Which of the following is amphoteric oxide? Mn2O7, CrO3, Cr2O3, CrO, V2O5, V2O4 
(a) V2O5, Cr2O3
(b) Mn2O7, CrO3
(c) CrO, V2O5
(d) V2O5, V2O4

Question. KMnO4 acts as an oxidising agent in alkaline medium. When alkaline KMnO4 is treated with KI, iodide ion is oxidised to ____________. 
(a) I₂
(b) IO^–
(c) IO₃^–
(d) IO₄^–

Question. Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?
(a) Co²⁺
(b) Cr²⁺
(c) Mn²⁺
(d) Cr³⁺

Question. Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d 5. 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
(c) Co
(d) Cu

Question. Which of the following statements is not correct?
(a) Copper liberates hydrogen from acids.
(b) In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine.
(c) Mn3+ and Co3+ are oxidising agents in aqueous solution.
(d) Ti2+ and Cr2+ are reducing agents in aqueous solution.

Question. Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions. Which of the following compounds are coloured?
(a) KMnO₄
(b) Ce(SO₄)₂
(c) TiCl₄
(d) Cu₂Cl₂

Question. Gun metal is an alloy of
(a) Cu and Al
(b) Cu and Sn
(c) Cu, Zn and Sn
(d) Cu, Zn and Ni

Question. The starting material for the manufacture of KMnO₄ is
(a) pyrolusite
(b) manganite
(c) magnatite
(d) haematite

Question. Which of the following oxidation state is common for all lanthanoids? 
(a) +2
(b) +3
(c) +4
(d) +5

Question. Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium? 
(a) [Xe] 4f ⁷ 5d ¹ 6s²
(b) [Xe] 4f ⁶ 5d ² 6s²
(c) [Xe] 4f ⁸ 6d ²
(d) [Xe] 4f ⁹ 5s¹

Question. On addition of small amount of KMnO4 to concentrated H2SO4, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.
(a) Mn₂O₇
(b) MnO₂
(c) MnSO₄
(d) Mn₂O₃

Question. Which one of the following is coinage metal ?
(a) Zn
(b) Cu
(c) Sn
(d) Pb.

Question. In the laboratory, manganese (II) salt is oxidised to permanganate ion in aqueous solution by
(a) hydrogen peroxide
(b) conc. nitric acid
(c) peroxy disulphate
(d) dichromate

Question. Which of the following reactions are disproportionation reactions? 
(i) Cu⁺ →Cu²⁺ + Cu
(ii) 3MnO₄^–2 +4H⁺→2MnO₄^– +MnO₂ +2H₂O
(iii) 2KMnO₄ →K₂MnO₄ + MnO₂ + O₂
(iv) 2MnO¯₄ +3Mn²⁺+2H₂O →5MnO₂+4H⁺
(a) (i), (ii)
(b) (i), (ii), (iii)
(c) (ii), (iii), (iv)
(d) (i), (iv)

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

Question. 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

Question. Which of the following element is not a member of transition elements ?
(a) Zn
(b) Pt
(c) Ce
(d) Mo

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) Ti < V < Mn < Cr, increasing second ionisation enthalpy
(c) Ti < V < Cr < Mn, increasing melting point
(d) Ti³⁺ < V³⁺ < Cr³⁺ < Mn³⁺, increasing magnetic moment

Question. Railway wagon axles are made by heating iron rods embedded in charcoal powder. This process is known as
(a) tempering
(b) case hardening
(c) sherardising
(d) annealing

Question. The form of iron having the highest carbon content is
(a) cast iron
(b) wrought iron
(c) stainless steel
(d) mild steel

Question. CrO₃ dissolves in aqueous NaOH to give 
(a) CrO₄^2-
(b) Cr(OH)^–₃
(c) Cr₂O₇^2-
(d) Cr(OH)₂

Question. Brass, bronze and German silver have one common metal. This is
(a) Zn
(b) Fe
(c) Al
(d) Cu

Question. Which of the following is the green coloured powder produced when ammonium dichromate is used in fire works ? 
(a) Cr
(b) CrO₃
(b) Cr₂O₃
(d) CrO(O₂ )

Question. When calomel reacts with NH₄OH solution, the compound formed is 
(a) NH₂—Hg—Cl
(b) Hg₂Cl₂NH₃
(c) Hg(NH₃ )2 Cl₂
(d) HgCI₂NH₃

Question. Copper sulphate solution reacts with KCN and gives
(a) K₃[Cu(CN)₄ ]
(b)CuCN 
(c) Cu(CN)z
(d) K₂[Cu(CN)₄ ]

Question. Least paramagnetic property is shown by 
(a) Fe
(b) Mn
(c) Ni
(d) Cu

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

Question. Which of the following statements concerning transition elements is false ? 
(a) They are all metals
(b) They easily form complex coorclination compounds
(c) Compounds containing their ions are mostly coloured
(d) They show multiple oxidation states al ways cliffering by units of two

Question. What elements are present in ƒ-block series? 
(a) Lanthanoids
(b) Actinoids
(c) Lanthanoids and actinoids
(d) Lipids

Question. What are lanthanides and actinides?
(a) Inner-transition element
(b) Noble gas
(c) Normal element
(d) Transition element

Question. The outer electronic configuration of Gd (atomic number 64) is
(a) 4ƒ³, 5d⁵, 6s²
(b) 4ƒ⁸, 5d⁰, 6s²
(c) 4ƒ⁴, 5d⁴, 6s²
(d) 4ƒ⁷, 5d¹, 6s²

Question. In context of the lanthanoids, which of the following statements is not correct ?
(a) There is a gradual decrease in the radius of the members with increasing atomic number in the series
(b) All the members exhibit + 3 oxidation state
(c) Because of similar prope1ties the separation of lanthanoids is not easy
(d) Availability of 4 ƒ-electrons results in the formation of compounds in + 4 state for all members of the series

Question. Consider the following statements.
I. La(OH)₃ is the least basic among hydroxides oflanthanides.
II. Zr⁴⁺ and Hf⁴⁺ possess almost the same ionic radius.
III. Ce⁴⁺ can act as an oxidising agent.
Which of the above is/are true?
(a) I and III
(b) II and III
(c) Only II
(d) I and II
(e) Only I

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 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. 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. Transition metals mostly are
(a) diamagnetic
(b) paramagnetic
(c) neither diamagnetic nor paramagnetic
(d) both diamagnetic and paramagnetic

Question. The number of unpaired electrons in a nickel atom in ground state are 􀀋At. No. of Ni 􀀠 28􀀌
(a) 2
(b) 5
(c) 3
(d) 7

Question. When KMnO4 solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because 
(a) CO2 is formed as the product.
(b) Reaction is exothermic.
(c) MnO 4 – catalyses the reaction.
(d) Mn2+ acts as autocatalyst.

Question. Brass is an alloy of
(a) Zn and Sn
(b) Zn and Cu
(c) Cu, Zn and Sn
(d) Cu and Sn

Question. The first element in the 3d-transition series is
(a) Sc
(b) Ti
(c) V
(d) Ca

Question. Which one of the following transition elements does not exhibit variable oxidation state?
(a) Ni
(b) Cu
(c) Fe
(d) Sc

Question. Which one of the following is an example of non-typical transition elements ?
(a) Li, K, Na
(b) Be, Al, Pb
(c) Zn, Cd, Hg
(d) Ba, Ga, Sr.

Question. The transition metals have a less tendency to form ions due to
(a) high ionisation energy
(b) low heat of hydration of ions
(c) high heat of sublimation
(d) All of these

Question. The common oxidation states of Ti are
(a) + 2 and + 3
(b) + 3 and + 4
(c) – 3 and – 4
(d) + 2, + 3 and + 4

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 B.M.
(b) 3.87 B.M.
(c) 3.47 B.M.
(d) 3.57 B.M.

Question. The catalytic activity of transition metals and their compounds is mainly due to
(a) their magnetic behaviour
(b) their unfilled d-orbitals
(c) their ability to adopt variable oxidation state
(d) their chemical reactivity

Question. Which of the following transition element shows the highest oxidation state ?
(a) Mn
(b) Fe
(c) V
(d) Cr

Question. Which of the following elements does not showvariable oxidation states?
(a) Copper
(b) Iron
(c) Zinc
(d) Titanium

Question. Transition metals usually exhibit highest oxidation states in their
(a) chlorides
(b) fluorides
(c) bromides
(d) iodides

Question. Which of the following is not correct about transition metals?
(a) Their melting and boiling points are high
(b) Their compounds are generally coloured
(c) They can form ionic or covalent compounds
(d) They do not exhibit variable valency

Question. Which of the following statements about the interstitial compounds is incorrect ?
(a) They are chemically reactive.
(b) They are much harder then the pure metal.
(c) They have higher melting points than the pure metal.
(d) They retain metallic conductivity.

Question. Maximum oxidation state is shown by
(a) Os
(b) Mn
(c) Co
(d) Cr

Question. Zinc and mercury do not show variable valency like d-block elements because
(a) they are soft
(b) their d-shells are complete
(c) they have only two electrons in the outermost subshell
(d) their d-shells are incomplete

Question. Transition elements
(a) have low melting point
(b) exhibit variable oxidation states
(c) do not form coloured ions
(d) show inert pair effect

Question. What is wrong about transition metals?
(a) Diamagnetic
(b) Paramagnetic
(c) Form complexes
(d) Shows variable oxidation state

Question. Actinoids exhibit greater number of oxidation states than lanthanoids. The main reason being
(a) more energy difference between 5f and 6d than between 4f and 5f orbitals
(b) 4f orbitals are more diffused than the 5f orbitals
(c) lesser energy difference between 5f and 6d than between 4f and 5d orbitals
(d) more reactive nature of the actinoids than the lanthanoids.

Question. The elements which exhibit both vertical and horizontal similarites are
(a) inert gas elements
(b) representative elements
(c) rare elements
(d) transition elements

Question. The valence shell of transition elements consists of
(a) nd orbitals
(b) (n-1) d orbitals
(c) ns np nd orbitals
(d) (n-1) d ns orbitals

Question. Number of unpaired electrons in Ni²⁺(Z=28) is
(a) 4
(b) 2
(c) 6
(d) 8

Question. Formation of interstitial compound makes the transition metal
(a) more soft
(b) more ductile
(c) more metallic
(d) more hard

Question. If a non metal is added to the interstital sites of a metal, then the metal becomes
(a) softer
(b) less tensile
(c) less malleable
(d) more ductile

We hope the above multiple choice questions for Class 12 Chemistry for Chapter 8 The D – and F – Block Elements provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. The D – and F – Block Elements is an important chapter in Class 12 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 12 students. Please go through these and let us know if you have any feedback in the comments section.