Please refer to Chapter 8 The d and f Block Elements MCQ Class 12 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Chemistry. Students should refer to MCQ Questions for Class 12 Chemistry with Answers to score more marks in Grade 12 Chemistry exams. Students should read the chapter The d and f Block Elements and then attempt the following objective questions.

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

The d and f Block Elements MCQ Class 12 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. In 3d-series atomic number (Z) varies from
(a) Z = 21− 30
(b) Z = 22 − 30
(c) Z = 20 − 30
(d) Z = 31− 40

Question. The number of unpaired electrons in gaseous species of Mn³⁺, Cr³⁺ and V³⁺ respectively are.
(a) 4, 3 and 2
(b) 3, 3 and 2
(c) 4, 3 and 2
(d) 3, 3 and 3

Question. Which of the following element does not belong to first transition series?
(a) Fe
(b) V
(c) Ag
(d) Cu

Question. The last electron in d-block elements goes to
(a) (n-1) d
(b) nd
(c) np
(d) (n-1) s

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

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. 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 outer electronic configuration of Ag is 4d ¹⁰ 5s¹, it belongs to
(a) 5^th period, group 4
(b) 4^th period, group 5
(c) 5^th period, group 11
(d) 6^th period, group 9

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. Manganese belongs to
(a) 1^st transition series
(b) 2^nd transition series
(c) 3^rd transition series
(d) 4^th transition series

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

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

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. Which of the following has more unpaired d-electrons?
(a) Zn⁺
(b) Fe²⁺
(c) Ni⁺
(d) Cu⁺

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

Question. KI and CuSO₄ solutions on mixing produce 
(a) Cu₂l₂ + K₂SO₄
(b) Cu₂l₂ + l₂ + K₂SO₄
(c) Cul₂ + K₂SO₄
(d) Cul₂ + l₂ + K₂SO₄

Question. Which do not decolourise KMnO₄ aqueous solution?
(a) C₂O₄^2-
(b) HSO^–₃
(c) CO^2-₃
(d) SO^2-₃

Question. Philosopher’s wool on heating with BaO at 1100°c produce 
(a) Ba + ZnCI₂
(c) BaZnO₂
(b) BaCdO₂
(d) BaO₂ + Zn

Question. Brass is an alloy of Cu with 
(a) Al
(b) Sn
(c) Ag
(d) Zn

Question. A white precipitate is formed on adding KI to CuSO₄ solution. It is of 
(a) Cu₂I₂
(b) CuI₂
(c) Cu₂S
(d) Cu₂SO₄

Question. The 3d-block element that exhibits maximum number of oxidation states is
(a) Sc
(b) Ti
(c) Mn
(d) Zn

Question. Among the following ions (hydrated), the colourless metal ion is 
(a) Cu⁺
(b) Cu²⁺
(c) Fe²⁺
(d) Mn²⁺

Question. Which of the following is used as indelibleink?
(a) Aqueous CuSO₄ solution 
(b) Aqueous AgNO₃ solution
(c) Aqueous NaCl solution
(d) Aqueous NaOH solution

Question. Ford-block elements the first ionisation 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. Which of the following is amphoteric?
(a) V₂O₃
(b) CuO
(c) V₂O₅
(d) NiO

Question. What is the correct order of spin only magnetic moment (in BM) of Mn²⁺, Cr²⁺ and V²⁺ ? 
(a) Mn²⁺ > V²⁺ > Cr²⁺
(b) V²⁺ > Cr²⁺ > Mn²⁺
(c) Mn²⁺ > Cr²⁺ > V²⁺
(d) Cr²⁺ > V²⁺ > Mn²⁺

Question. Which pair of compounds is expected to show similar colour in aqueous medium ? 
(a) FeCI₃ and CuCI₂
(b) VOCI₂ and CuCI₂
(c) VOCI₂ and FeCI₂
(d) FeCI₂ and MnCI₂

Question. Which of the following is deliquescent?
(a) ZnCI₂
(b) Hg₂CI₂
(c) HgCI₂
(d) CdCI₂

Question. KMnO₄ in basic medium is reduced to
(a) K₂MnO₄
(b) MnO₂
(c) Mn(OH)₂
(d) Mn²⁺

Question. Number of electrons in 3d-orbital of v²⁺, Cr²⁺, Mn²⁺ and Fe²⁺ are 3, 4, 5, and 6 respectively. Which of the following ions will have largest value of magnetic moment ( μ )? 
(a) V²⁺
(b) Cr²⁺
(c) Mn²⁺
(d) Fe²⁺

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

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 elements does not showvariable oxidation states?
(a) Copper
(b) Iron
(c) Zinc
(d) Titanium

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

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

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

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. Which of the following ions has the maximum magnetic moment?
(a) Mn⁺²
(b) Fe⁺²
(c) Ti³⁺
(d) Cr⁺²

Question. Titanium shows magnetic moment of 1.73 B.M. in its compound. What is the oxidation number of Ti in the compound?
(a) +1
(b) +4
(c) +3
(d) +2

Question. The magnetic nature of elements depend on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.
(a) 3d⁷
(b) 3d ⁵
(c) 3d⁸
(d) 3d ²

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

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. 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

Question. An explosion take place when conc. H₂SO₄ is added to KMnO₄. Which of the following is formed?
(a) Mn₂O₇
(b) MnO₂
(c) MnSO₄
(d) M₂O₃

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

Question. Transition metals show catalytic activity
(a) Due to their ability to form complexes.
(b) Due to their ability to show multiple oxidation state.
(c) Due to availabiltiy of d orbitals for bond formation.
(d) Both (a) and (b).

Question. Which of the following transition metal on catalysis the reaction between iodide and persulphate ion?
(a) Fe²⁺
(b) Fe³⁺
(c) Ni²⁺
(d) Both (a) and (c)

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

Question. The bonds present in the structure of dichromate ion are
(a) four equivalent Cr – O bonds only
(b) six equivalent Cr – O bonds and one O – O bond
(c) six equivalent Cr – O bonds and one Cr – Cr bond
(d) six equivalent Cr – O bonds and one Cr – O – Cr bond

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 of the following is colourless in water?
(a) Ti³⁺
(b) V³⁺
(c) Cu³⁺
(d) Sc³⁺

Question. The acidic, basic or amphoteric nature of Mn₂O₇, V₂O₅ and CrO are respectively
(a) acidic, acidic and basic
(b) basic, amphoteric and acidic
(c) acidic, amphoteric and basic
(d) acidic, basic and amphoteric

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. Bronze is an alloy of
(a) Pb + Sn + Zn
(b) Cu + Sn
(c) Pb + Zn
(d) Cu + Zn

Question. An alloy of transition metal containing a non transition metal as a constituent is
(a) invar
(b) bronze
(c) chrome steel
(d) stainless steel

Question. Which of the following transition metal ion is colourless in aqueous solution?
(a) Ti⁴⁺
(b) Zn²⁺
(c) V⁴⁺
(d) Both (a) and (b)

Question. If KMnO₄ is reduced by oxalic acid in an acidic medium then oxidation number of Mn changes from
(a) 4 to 2
(b) 6 to 4
(c) +7 to +2
(d) 7 to 4

We hope you liked the above The d and f Block Elements MCQ Class 12 Chemistry. In case you have any questions please put them in the comments box below and our teachers will provide you a response.