VBQs The d – and f – Block Elements Class 12 Chemistry

VBQs The d – and f – Block Elements Class 12 Chemistry with The d – and f – Block Elements has been provided below for standard students. We have provided chapter wise VBQ for Class 12 Chemistry with The d – and f – Block Elements. The following The d – and f – Block Elements Class 12 Chemistry value based questions with answers will come in your exams. Students should understand the concepts and learn the solved cased based VBQs provided below. This will help you to get better marks in class 12 examinations.

The d – and f – Block Elements VBQs Class 12 Chemistry

Question. Which of the following has the maximum number of unpaired electrons?
(a) Ti²⁺
(b) Fe²⁺
(c) Cr⁺
(d) Cu⁺

Question. Which of the following configuration is correct for iron ?
(a) 1s²,2s²2p⁶,3s²3p⁶3d⁴
(b) 1s²,2s²2p⁶,3s²3p⁶3d⁶4s²
(c) 1s²,2s²2p⁶,3s²3p⁶3d²
(d) 1s²,2s²2p⁶,3s²3p⁶3d²4s²

Question. Four successive members of the first row transition elements are listed below with their atomic numbers.
Which one of them is expected to have the highest third ionization enthalpy?
(a) Vanadium (Z = 23)
(b) Chromium (Z = 24)
(c) Manganese (Z = 25)
(d) Iron (Z = 26)

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

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

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

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. An atom has electronic configuration
1s² 2s² 2p⁶3s²3p⁶3d³4s² in which group would it be placed?
(a) Fifth
(b) Fifteenth
(c) Second
(d) Third

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

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

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.Which of the following pairs has the same size?
(a) Fe²⁺ , Ni²⁺
(b) Zr⁴⁺ , Ti⁴⁺
(c) Zr⁴⁺ , Hf ⁴⁺
(d) Zn²⁺ , Hf ⁴⁺

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

Question. The transition elements have a general electronic configuration

Question. Which one 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)

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

Question.Which one of the following species is paramagnetic?
(a) N₂
(b) Co
(c) Cu⁺
(d) Zn

Question. The no. of unpaired electrons in Mn⁷⁺ ions  (At. no. of Mn = 25) is
(a) 0
(b) 1
(c) 2
(d) 3

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

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

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

Question.Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?
(a) 3d⁵4s¹
(b) 3d⁵4s²
(c) 3d²4s²
(d) 3d³4s²

Question. Correct electronic configuration of Cr (Z = 24) is
(a) 1s² 2s² 2p⁶ 3s² 3p⁶ 3^{d 7} 4s¹
(b) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹
(c) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d ⁷ 4s²
(d) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d ⁶ 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. Which one of the following ions is the most stable in aqueous solution?
(a) V³⁺
(b) Ti³⁺
(c) Mn³⁺
(d) Cr³⁺
(At.No. Ti = 22, V = 23, Cr = 24, Mn = 25)

Question. Which of the following statements is incorrect?
(a) Zn,Cd and Hg due to presence of completely filled d-orbitals [(n–1)d¹⁰ns²] are not studied along with other transition metals.
(b) Zn, Cd and Hg have low m.p and are comparitively softer than other transition metals.
(c) Metallic bond made by elements with d ⁵ configuration is stronger as compared to metalic bond made by elements with d ³ configuration.
(d) Metals of 5d series forms strong metallic bonds as compared with metals of 3d series.

Question. Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them ?
(a) (n – 1)d³ ns²
(b) (n – 1)d⁵ ns¹
(c) (n – 1)d⁸ ns²
(d) (n – 1)d⁵ ns²

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 points
(d) Ti < V < Mn < Cr : increasing 2nd ionization enthalpy

Question. (n -1)d¹⁰ns² is the general electronic configuration of
(a) Fe, Co, Ni
(b) Cu, Ag, Au
(c) Zn, Cd, Hg
(d) Se, Y, La

Question. Which of the following does not represent the correct order of the properties indicated ?
(a) Ni²⁺ > Cr²⁺ > Fe²⁺ > Mn²⁺ (size)
(b) Sc > Ti > Cr > Mn (size)
(c) Mn²⁺ > Ni²⁺ < Co²⁺ <Fe²⁺ (unpaired electron)
(d) Fe²⁺ > Co²⁺ > Ni²⁺ > Cu²⁺ (unpaired electron)

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

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. In first transition series, the melting point of Mn is low because
(a) due to d¹⁰ configuration, metallic bonds are strong
(b) due to d⁷ configuration, metallic bonds are weak
(c) due to d⁵ configuration, metallic bonds are weak
(d) None of these

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

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

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.Question.Which of the following is incorrect?
(a) Mn shows oxidation state of +7 in MnF₇
(b) Fe and Co shows +3 oxidation state in FeX₃ and CoF₃.
(c) V shows oxidation state of + 5 in VF₅.
(d) Cu does not shows +2 oxidation state with I^–.

Question. Which of the following species is/are paramagnetic?
Fe²⁺, Zn⁰, Hg²⁺, Ti⁴⁺
(a) Fe²⁺ only
(b) Zn⁰ and Ti⁴⁺
(c) Fe²⁺ and Hg²⁺
(d) Zn⁰ and Hg²⁺

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.. For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order?
(a) Mn > Fe > Cr > Co
(b) Fe > Mn > Co > Cr
(c) Co > Mn > Fe > Cr
(d) Cr > Mn > Co > Fe